U.S. patent application number 10/546108 was filed with the patent office on 2006-07-06 for beam joint device.
Invention is credited to Yasushi Maeda, Hiroshi Nakamura, Yasuhiro Nakata, Kazuaki Suzuki, Toru Takeuchi.
Application Number | 20060144006 10/546108 |
Document ID | / |
Family ID | 32929666 |
Filed Date | 2006-07-06 |
United States Patent
Application |
20060144006 |
Kind Code |
A1 |
Suzuki; Kazuaki ; et
al. |
July 6, 2006 |
Beam joint device
Abstract
A beam joining apparatus for joining a flange 2 of a beam 1 to a
flange 6 mounted on a pillar 5 includes a splice plate 9 fastened
to the flanges 6, 2 of the pillar 5 and the beam 1 and having a
central plastic region 11, and an anti-buckling member 13 mounted
independently of the splice plate 9, on the splice plate 9, for
preventing the buckling of the plastic region 11.
Inventors: |
Suzuki; Kazuaki; (Tokyo,
JP) ; Maeda; Yasushi; (Tokyo, JP) ; Nakata;
Yasuhiro; (Tokyo, JP) ; Nakamura; Hiroshi;
(Tokyo, JP) ; Takeuchi; Toru; (Chiba, JP) |
Correspondence
Address: |
KENYON & KENYON LLP
ONE BROADWAY
NEW YORK
NY
10004
US
|
Family ID: |
32929666 |
Appl. No.: |
10/546108 |
Filed: |
February 27, 2004 |
PCT Filed: |
February 27, 2004 |
PCT NO: |
PCT/JP04/02372 |
371 Date: |
August 18, 2005 |
Current U.S.
Class: |
52/655.1 |
Current CPC
Class: |
E04H 9/024 20130101;
E04B 2001/2442 20130101; E04B 2001/2448 20130101; E04B 2001/2454
20130101; E04B 2001/2415 20130101; E04B 2001/2457 20130101; E04B
1/2403 20130101 |
Class at
Publication: |
052/655.1 |
International
Class: |
E04H 12/00 20060101
E04H012/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 28, 2003 |
JP |
2003-054088 |
Feb 23, 2004 |
JP |
2004-046460 |
Claims
1. A beam joining apparatus for joining a beam flange to a flange
mounted on a pillar, comprising: a splice plate fastened to the
flanges of the pillar and the beam and having a plastic region at
the central portion thereof; and an anti-buckling member mounted on
the splice plate and formed independently of the splice plate to
prevent the buckling of the plastic region.
2. A beam joining apparatus as set forth in claim 1, further
comprising an anti-sticking means arranged between the splice plate
and the anti-buckling member to prevent the anti-buckling member
and the splice plate from sticking to each other.
3. A beam joining apparatus as set forth in claim 1, wherein the
longitudinal central portion of the splice plate has a smaller
sectional area crossing the splice plate, and this particular
portion has a lower yield strength than the remaining portions and
forms the plastic region of the splice plate.
4. A beam joining apparatus as set forth in claim 3, wherein the
longitudinal central portion of the splice plate is formed with at
least one hole.
5. A beam joining apparatus as set forth in claim 3, wherein the
splice plate has notches formed on the sides of the longitudinal
central portion.
6. A beam joining apparatus as set forth in claim 3, wherein the
splice plate has notches formed on the sides of the longitudinal
central portion and at least one hole arranged adjacent to the
notches.
7. A beam joining apparatus as set forth in claim 2, wherein the
anti-sticking means includes an anti-sticking layer arranged
between the splice plate and the anti-buckling member.
8. A beam joining apparatus as set forth in claim 7, wherein the
anti-sticking layer includes a sheet member or a film member.
9. A beam joining apparatus as set forth in claim 2, wherein the
anti-sticking member includes a means to form an air layer between
the splice plate and the anti-buckling member.
10. A beam joining apparatus as set forth in claim 2, wherein the
anti-sticking means includes a lubricant coated on one of the
opposed surfaces of the splice plate and the anti-buckling
member.
11. A beam joining apparatus as set forth in claim 2, wherein the
anti-sticking means includes a film coated on one of the opposed
surfaces of the splice plate and the anti-buckling member.
12. A beam joining apparatus as set forth in claim 1, wherein the
splice plate is mounted on at least one of the upper and lower
surfaces of the flanges of the pillar and the beam.
13. A beam joining apparatus as set forth in claim 1, wherein the
beam includes a web arranged in vertical direction, an upper flange
formed integrally along the upper edge portion of the web, and a
lower flange formed integrally along the lower edge portion of the
web, wherein the pillar has upper and lower flanges arranged spaced
along the pillar by the distance equal to the distance between the
upper and lower flanges of the beam, and wherein the splice plate
is used to couple the lower flange of the beam to the lower flange
of the pillar, and the beam joining apparatus further comprising
another splice plate for coupling the upper flange of the beam to
the upper flange of the pillar, which another splice plate has
reinforcing ribs arranged in vertical plane and resistant to the
shearing force.
14. A beam joining apparatus as set forth in claim 1, wherein bolts
for mounting the anti-buckling member on the plastic region are
arranged in such a manner as to contact the side surface of the
plastic region deformed thereby to limit the deformation of the
plastic region.
15. A beam joining apparatus as set forth in claim 1, wherein an
annular member is arranged between the splice plate and the
anti-buckling member, and bolts for mounting the anti-buckling
member on the plastic region are inserted through the annular
member, so that when the plastic region is deformed, the side
surface of the plastic region is adapted to come into contact with
the outer surface of the annular member thereby to limit the
deformation of the plastic region.
16. A beam joining apparatus as set forth in claim 1, wherein the
anti-buckling member includes a splice plate transverse deformation
prevention means for preventing the transverse buckling deformation
of the splice plate.
Description
TECHNICAL FIELD
[0001] This invention relates to a beam joining apparatus for
joining a beam to a pillar of an iron-frame building.
BACKGROUND ART
[0002] Japanese Unexamined Patent Publication No. 2000-144901
discloses a beam joining apparatus comprising a splice plate 100
shown in FIG. 16 for joining a pillar flange and a beam flange of
an iron-frame building to each other. In FIG. 16, the splice plate
100 includes a plate member 102 having a narrowed central portion.
A pair of reinforcing ribs 106 arranged in spaced relation, to each
other, in the axial direction of the beam are fixedly attached to
the plate member 102. In the plate member 102, the portion between
the reinforcing ribs 106 forms a plastic region 108. Also, the
plate member 102 is formed with bolt holes 104 for fastening the
plate member 102 by bolts (not shown) to the pillar flange (not
shown) and the beam flange (not shown).
[0003] In the splice plate 100, an increased size D of the interval
between the reinforcing ribs 106 would cause the plastic region 108
to buckle under a large force which would be exerted on the plate
member 102 at the time of an earthquake or the like and, therefore,
the interval between the reinforcing ribs 24 cannot be widened. In
the case where the interval D between the reinforcing ribs 24 is
increased, on the other hand, a tension and a compression which may
act on the plate member 102 in axial direction of the beam at the
time of an earthquake would increase the distortion of the plastic
region 11 of the plate member 102 (distortion .delta. of plastic
region=extension of plate member 102 divided by interval D between
reinforcing ribs 106) and may break the plate member 102 at the
plastic region 108 (Problem 1).
[0004] Further, when welding the reinforcing ribs 106 to the plate
member 102, the plate member 102 is thermally affected along the
weld line formed at the time of the welding, so that the mechanical
characteristics, such as the yield point, the tensile strength and
tenacity thereof, are reduced (Problem 2). As a result, the
repetitive load of earthquakes is liable to break the plate member
102 early due to the fatigue along the weld line. Also, stress is
concentrated along the weld line of the plate 102, and the breakage
is liable to occur from the weld line (Problem 3).
[0005] On the other hand, Japanese Unexamined Patent Publication
No. 2000-144901 discloses a beam joining apparatus 110 having
anti-buckling members 116 as shown in FIG. 17. The beam joining
apparatus 110 is mounted on the pillar flange (not shown) and the
beam flange (not shown) by inserting bolts (not shown) through the
bolt holes 114, 118 formed in the splice plate 112 and the
anti-buckling members 116. As compared with the beam joining
apparatus 100 shown in FIG. 16, therefore, the anti-buckling
members 116 must be mounted on the pillar flange and the beam
flange (not shown), thereby increasing the number of parts and the
number of steps for assembling the beam joining apparatus (Problem
4).
[0006] Also, in constructing this structure, the splice plate 112
is mounted on the pillar flange and the beam flange at the same
time as the anti-buckling members 116, but the anti-buckling
members 116 cannot be mounted after the splice plate 112, thereby
reducing the construction freedom. Further, as the anti-buckling
members 116 are mounted directly on the splice plate 112, the gap
between the anti-buckling members 116 and the plastic region of the
splice plate 112 is changed by the change in the building
structure, and thus this gap cannot be maintained constant, thereby
making it impossible to prevent buckling in steady manner (Problem
5).
DISCLOSURE OF THE INVENTION
[0007] The object of this invention is to provide a beam joining
apparatus solving at least the problems of the prior art, as
described above, by mounting an anti-buckling member independent of
the splice plate on the plastic region of the splice plate without
mounting the reinforcing ribs on the splice plate unlike in the
prior art.
[0008] According to this invention, there is provided a beam
joining apparatus for joining a flange of the beam to a flange
mounted on a pillar, comprising a splice plate fastened to the
pillar and beam flanges and having a plastic central portion, an
anti-buckling member mounted on the splice plate independently of
the splice plate for preventing the buckling of the plastic region,
and an anti-sticking means arranged between the splice plate and
the anti-buckling member to prevent the anti-buckling member and
the splice plate from sticking to each other.
[0009] This invention can produce the following effects: [0010] (1)
The buckling of the splice plate due to the deformation under
tension and compression is prevented and, even after the splice
plate is plasticized, a stable hysteresis characteristic is
obtained. [0011] (2) The length of the plastic region of the splice
plate can be freely set. In the case where the plastic region
desirably yields early under the earthquake load, therefore, the
length of the plastic region is shortened, and vice versa. In this
way, the yield timing can be adjusted by the length of the plastic
region, and the design freedom is remarkably improved. [0012] (3)
The maximum distortion to which the plastic region is subjected to
at the time of an earthquake can be controlled by the length of the
plastic region, and therefore the performance of the plastic region
against the metal fatigue can also be controlled. [0013] (4) The
plastic region of the splice plate is free of the weld zone, and
therefore the effect of welding on the material is eliminated.
Thus, the yield load of the splice plate is not changed nor is the
tenacity thereof reduced. Also, the deterioration due to the
fatigue caused by the stress concentration or the material change
along the weld line is prevented. [0014] (5) The anti-buckling
member includes a means for preventing the transverse deformation
of the splice plate to prevent the splice plate from being buckled
and deformed in transverse direction. Thus, the buckling along the
thickness of the plastic region of the splice plate is prevented
while at the same time preventing the excessive deformation along
the width thereof. [0015] (6) According to this invention, the
anti-buckling member can be arranged in such a manner as to always
secure a predetermined clearance for the plastic region of the
splice plate, and therefore the buckling can always be prevented in
stable fashion.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a side view showing a beam joining apparatus
according to a first embodiment of the invention.
[0017] FIG. 2 is a longitudinal front view of a beam joining
apparatus cut along the plastic region of the splice plate
according to the first embodiment.
[0018] FIG. 3 is an exploded perspective view of the beam joining
apparatus according to the first embodiment of the invention.
[0019] FIG. 4A is a plan view of a first splice plate.
[0020] FIG. 4B is a plan view of a second splice plate.
[0021] FIG. 4C is a plan view of a third splice plate.
[0022] FIG. 4D is a plan view of a fourth splice plate.
[0023] FIG. 5A is a perspective view of a first anti-buckling
member as taken from thereunder.
[0024] FIG. 5B is a perspective view of a first anti-buckling
member as taken from thereabove.
[0025] FIG. 6 is a side view showing a beam joining apparatus
according to a second embodiment of the invention.
[0026] FIG. 7 is a longitudinal front view cut along the plastic
region of the splice plate according to the second embodiment of
the invention.
[0027] FIG. 8 is an exploded perspective view of the beam joining
apparatus according to the second embodiment of the invention.
[0028] FIG. 9A is a perspective view of another example of the
first anti-buckling member as taken from thereunder.
[0029] FIG. 9B is a perspective view of another example of the
first anti-buckling member as taken from thereabove.
[0030] FIG. 10A is a plan view of another example of the first
splice plate.
[0031] FIG. 10B is a plan view of still another example of the
first splice plate.
[0032] FIG. 10C is a plan view of yet another example of the first
splice plate.
[0033] FIG. 10D is a plan view of a further example of the first
splice plate.
[0034] FIG. 11 is a side view of the beam joining apparatus
according to a third embodiment of the invention.
[0035] FIG. 12 is a longitudinal front view of the beam joining
apparatus cut along the plastic region of the splice plate
according to the third embodiment of the invention.
[0036] FIG. 13 is an enlarged sectional view of the part indicated
by A in FIG. 12.
[0037] FIG. 14A is a bottom view of the beam joining apparatus
according to the third embodiment as taken from thereunder.
[0038] FIG. 14B is an enlarged plan view of the part indicated by B
in FIG. 14A.
[0039] FIG. 15 is a side view showing an example of application of
the beam joining apparatus according to the invention to the pillar
flange of split-T type.
[0040] FIG. 16 is a perspective view showing an example of the
splice plate according to the prior art.
[0041] FIG. 17 is a perspective view showing another example of the
splice plate according to the prior art.
BEST MODE FOR CARRYING OUT THE INVENTION
[0042] Preferred embodiments of the invention are described
below.
[0043] First, with reference to FIGS. 1 to 5B, a beam joining
apparatus according to a first embodiment of the invention is
explained.
[0044] In FIGS. 1 to 3, a beam 1 is coupled to a pillar 5 erected
vertically from the foundation (not shown) of a building. The beam
1 includes a web 4 arranged vertically, a lower flange 2 formed
integrally along the lower edge of the web 4, and an upper flange 8
formed integrally along the upper edge of the web 4. The pillar 5
has mounted thereon upper and lower flanges 7, 6 arranged in
substantially the same spaced relation with each other along the
pillar 5 as the upper and lower flanges 8, 2 of the beam 1. In FIG.
2, the two-dot chain with reference numeral 29 indicates a floor
slab.
[0045] The portion of the beam 1 adjacent to the end of the lower
flange 2 is formed with a pair of bolt holes 3 along the axial
direction of the beam 1 symmetrically about the center of the web
portion 4. The bolt holes 3 are preferably formed at the same
position along the axis of the beam 1.
[0046] The lower flange 2 of the beam 1 is fastened to the lower
flange 6 of the pillar 5 by first and second splice plates 9, 9' as
beam joint members. The first and second splice plates 9, 9' are
fastened to the lower flange 6 of the pillar 5 and the lower flange
2 of the beam 1 by bolts 16. The lower flange 6 of the pillar 5 and
the lower flange 2 of the beam 1 are formed with a plurality of
bolt holes 19, 18 through which the bolts 16 are inserted.
[0047] The upper flange 8 of the beam 1 is fastened to the upper
flange 7 of the pillar 5 by third and fourth splice plates 30, 30'
as beam joint members. The third and fourth splice plates 30, 30'
are fastened to the upper flange 7 of the pillar 5 and the upper
flange 8 of the beam 1 by bolts 31. The upper flange 7 of the
pillar 5 and the upper flange 8 of the beam 1 are formed with a
plurality of bolt holes (not shown) through which the bolts 31 are
inserted.
[0048] The first splice plate 9 is arranged on the lower surfaces
of the lower flange 2 of the beam 1 and the lower flange 6 of the
pillar 5. The first splice plate 9, as shown in FIG. 4A, is formed
of a rectangular plate member, and a pair of slots 10 are formed at
the longitudinal central portion of the first splice plate 9. The
slots 10 are arranged in parallel spaced relation with each other
along the width of the first splice plate 9 in such a manner as to
be superposed vertically on the bolt holes 3 of the lower flange 2
when the first splice plate 9 is mounted on the lower flange 2 of
the beam 1. Further, the first splice plate 9 is formed with a
plurality of bolt holes 28 corresponding to the bolt holes 18, 19
of the lower flange 2 of the beam 1 and the lower flange 6 of the
pillar 5.
[0049] According to this embodiment, the slots 10 thus formed
reduce the cross sectional area of the first splice plate 9 at the
longitudinal central area thereof including the slots 10. As a
result, the yield strength of this area is lower than that of the
other areas, and therefore this particular area makes up the
plastic region 11 of the first splice plate 9.
[0050] The second splice plate 91 is arranged on the upper surfaces
of the lower flange 2 of the beam 1 and the lower flange 6 of the
pillar 5. Referring to FIG. 4B, the second splice plate 9' is
formed of a rectangular plate member, and a slot 10' is formed at
the longitudinal central portion of the second splice plate 9'.
Further, the second splice plate 9' is formed with a plurality of
bolt holes 28' corresponding to the bolt holes 18, 19 of the lower
flange 2 of the beam 1 and the lower flange 6 of the pillar 5. The
slot 10' is arranged in such a manner as to be superposed
vertically on the pair of the bolt holes 3 of the lower flange 2
when each of the second splice plates 9' is mounted on the lower
flange 2 of the beam 1.
[0051] According to this embodiment, the slot 10' reduces that
sectional area of the longitudinal central area of the second
splice plate 9' including the slot 10' which crosses the second
splice plate 9'. Thus, the yield strength of this particular area
is lower than that of the other areas, and this particular area
makes up the plastic region 11' of the second splice plate 9'.
[0052] The third splice plate 30 is arranged on the upper surface
of the upper flange 8 of the beam 1 and the upper flange 7 of the
pillar 5. Referring to FIG. 4C, the third splice plate 30 is formed
of a rectangular plate member, and formed with a plurality of bolt
holes 32 corresponding to the bolt holes (not shown) of the upper
flange 8 of the beam 1 and the upper flange 7 of the pillar 5.
According to this embodiment, the third splice plate 30 has no
plastic region.
[0053] The fourth splice plate 30' is arranged on the lower surface
of the upper flange 8 of the beam 1 and the upper flange 7 of the
pillar 5. Referring to FIG. 4D, the fourth splice plate 30' is
formed of a rectangular plate member, and formed with a plurality
of bolt holes 32' corresponding to the bolt holes (not shown) of
the upper flange 8 of the beam 1 and the upper flange 7 of the
pillar 5. The fourth splice plate 30' has no plastic region
either.
[0054] As described above, the upper flange 8 of the beam 1 and the
upper flange 7 of the pillar 5 are coupled to each other through
the third and fourth splice plates 30, 30' having no plastic
region, and thus have such a structure that the third and fourth
splice plates 30, 30' resist the vertical shearing force. The third
and fourth splice plates 30, 30', as shown by two-dot chains in
FIG. 1, may have reinforcing ribs 20, 20'.
[0055] Incidentally, the first and second splice plates 9, 9' and
the third and fourth splice plates 30, 30', though preferably
formed of a steel material low in yield point, may be made of other
well-known materials, as required.
[0056] The beam joining apparatus according to this embodiment
further comprises first and second anti-buckling members 13, 13'
formed of a rectangular thick steel plate to prevent the buckling
of the plastic regions 11, 11' of the first and second splice
plates 9, 9'. The first anti-buckling member 13 is arranged on the
lower surface of the first splice plate 9 in such a manner as to be
superposed on the plastic region 11, and a first anti-sticking
layer 14 formed of a sheet or film of synthetic rubber or the like
is inserted as an anti-sticking means between the lower surface of
the first splice plate 9 and the plastic region 11. The
anti-sticking means prevents the first splice plate 9 from sticking
to the first anti-buckling member 13 in the case where the plastic
region 11, having been plastically deformed, is expanded along the
thickness and pressed against the first anti-buckling member 13.
The term "stick" is defined to indicate the state in which the
splice plate and the anti-buckling member cannot move relatively to
each other due to the friction force between them.
[0057] In similar fashion, the second anti-buckling member 13' is
arranged on the upper surface of the second splice plate 9' in such
a position as to be superposed on the plastic region 11', and
second anti-sticking layers 14' formed of a sheet or film of
synthetic rubber or the like are inserted as an anti-sticking means
between the second splice plate 9' and the plastic region 11'.
[0058] The first anti-buckling member 13, if made of the same
material as the first splice plate 9, is formed of a thicker steel
plate than the first splice plate 9 as shown in FIGS. 5A, 5B to
secure a higher bending rigidity than the first splice plate 9. The
first anti-buckling member 13 is formed of a rectangular plate
member 21 having four bolt holes 15 arranged in such a manner as to
be superposed on the slots 10, 10' of the first and second splice
plates 9, 9'. The first anti-sticking layer 14 is desirably
attached in advance to one side surface of the plate member 21 for
convenience in construction.
[0059] The second anti-buckling member 13' is formed of a
rectangular plate member and has bolt holes (not shown) or slots
corresponding to a pair of the slots 10 of the first splice plate 9
and the slots 10' of the second splice plate 9'. The second
anti-sticking layer 14' is also preferably attached to one side
surface of the plate member 21 in advance for the convenience of
construction.
[0060] The first splice plate 9 is arranged on the lower surface of
the lower flange 2 of the beam 1 and the lower flange 6 of the
pillar 5. The two second splice plates 9' are arranged on the upper
surface of the lower flange 2 and the upper surface of the lower
flange 6 of the pillar 5 on both sides of the web 4 of the beam 1.
The third splice plate 30 is arranged on the upper surface of the
upper flange 8 of the beam 1 and the upper surface of the upper
flange 7 of the pillar 5. The two fourth splice plates 30' are
arranged on the lower surface of the upper flange 8 and the lower
surface of the upper flange 6 of the pillar 5 on both sides of the
web 4 of the beam 1.
[0061] The first to fourth splice plates 9, 9', 30, 30' arranged in
this way are fastened to the lower flange 2 of the beam 1, the
lower flange 6 of the pillar 5, the upper flange 8 of the beam 1
and the upper flange 7 of the pillar 5 by inserting the bolts 16
such as high-tensile bolts into the bolt holes and screwing the
nuts on the bolts 16, so that the beam 1 is coupled to the pillar
5. In the process, the bolt holes 3 of the lower flange 2 of the
beam 1 and the slots 10, 10' of the first and second splice plates
9, 9' are arranged in the same vertical position.
[0062] Then, the first anti-buckling member 13 is arranged on the
plastic region 11 of the lower surface of the first splice plate 9.
Similarly, the second anti-buckling member 13' is arranged on the
plastic region 11' of the upper surface of the second splice plate
9'. Next, the first and second anti-buckling members 13, 13' are
mounted on the plastic regions 11, 11' of the first and second
splice plates 9, 9' by inserting the bolts 17 into the bolt holes
15 of the first anti-buckling member 13, the slots 10 of the first
splice plate 9, the bolt holes 3 of the lower flange 2 of the beam
1, the slots 10' of the second splice plate 9' and the bolt holes
15' of the second anti-buckling member 13' and screwing nuts on the
bolts 17.
[0063] According to this embodiment, the first and second
anti-sticking layers 14, 14' prevent the first and second
anti-buckling members 13, 13' from coming into direct contact with
the first and second splice plates 9, 9', respectively. As a
result, when the plastic regions 11, 11' of the first and second
splice plates 9, 9' are plastically deformed, transmission of the
axial force to the first and second anti-buckling members 13, 13'
is prevented. Further, the first and second anti-sticking layers
14, 14' absorb the expansion of the plastic regions 11, 11' of the
first and second splice plates 9, 9' under the compressive load.
Therefore, the rigidity of the first and second anti-buckling
members 13, 13' is not transmitted to the plastic regions 11, 11'.
As a result, the load and the secondary rigidity of the plastic
regions 11, 11' after plasticization are prevented from rising
sharply. In the design stage, therefore, only the rigidity and load
of the plastic regions 11, 11' have to be taken into consideration.
When the plastic regions 11, 11' are compressed and expanded, an
increase in the rigidity and load of the plastic regions 11, 11'
which otherwise might occur due to the contact with the first and
second anti-buckling members 13, 13' is suppressed.
[0064] In place of the first and second anti-sticking layers 14,
14', a space (clearance) may be formed between the first and second
anti-buckling members 13, 13' and the first and second splice
plates 9, 9'. In this case, ribs (not shown) or contacts (not
shown) may be formed on the first and second anti-buckling members
13, 13' as an anti-sticking means to form a space (clearance)
between the first and second anti-buckling members 13, 13' and the
first and second splice plates 9, 9'.
[0065] In the beam joining apparatus having this configuration,
even after the lower flange 2 of the beam 1 is coupled to the lower
flange 6 of the pillar 5 through the splice plate 9, the first and
second anti-buckling members 13, 13' can be mounted. Also, the
first and second anti-buckling members 13, 13' are independent of
the first and second splice plates 9, 9' and the lower flange 6 of
the pillar 5, and movable in axial direction relatively to the
first and second splice plates 9, 9' by the bolt holes 3 of the
lower flange 2 of the beam 1 and the slots 10, 10' formed in the
first and second splice plates 9, 9'.
Second Embodiment
[0066] With reference to FIGS. 6 to 9B, a second embodiment of the
invention is explained. Incidentally, this embodiment is different
from the first embodiment only in the shape of the first and second
anti-buckling members and the remaining portions thereof are
similarly configured to the corresponding portions of the first
embodiment. Therefore, the similar component elements are not
explained.
[0067] According to this embodiment, the first anti-buckling member
13 includes, as shown in FIGS. 9A, 9B, a rectangular plate member
21 and flanges 22 formed integrally with the edges of the plate
member 21. The plate member 21 is formed with four bolt holes 15
arranged at positions corresponding to the bolt holes 3 of the
lower flange 2 of the beam 1. Also in this embodiment, the first
anti-sticking layer 14 is desirably attached to one side surface of
the plate member 21 in advance for convenience in construction.
[0068] The plate member 21 prevents the buckling deformation along
the thickness of the first splice plate 9, and the flanges 22
prevent the buckling deformation primarily along the width of the
first splice plate 9. More specifically, the inside portions 22a of
the flanges 22 are arranged in somewhat larger spaced relation than
the width of the plastic region 11 of the first splice plate 9,
thereby providing a splice plate transverse deformation prevention
means for improving the bending rigidity of the plate member 21
while at the same time preventing the buckling deformation along
the width of the first splice plate 9. The outside portions 22b of
the flanges 22 improve the bending rigidity of the plate member 21.
In this way, the portions 22a, 22b of the flanges 22 have different
functions and therefore are not required to be arranged in the same
vertical plane. As shown in FIGS. 9A, 9B, however, the arrangement
of the portions 22a, 22b in the same vertical plane simplifies the
shape and can reduce the production cost of the first anti-buckling
member 13.
[0069] In embodying the invention, the portions 22a of the flanges
22 making up the splice plate transverse deformation prevention
means can be arranged partly discretely along the length of the
anti-buckling member 13, as required, in accordance with the shape
of the splice plate 9.
[0070] The second anti-buckling member 13' arranged on the upper
surface of the lower flange 2 of the beam 1 is different from the
first anti-buckling member 13 shown in FIGS. 9A, 8B in that the
former is smaller in width than the latter and has two bolt holes.
The other configuration is similar to that of the example explained
in FIGS. 9A, 8B, and therefore not shown in detail.
[0071] FIGS. 10A to 10D show other examples of the first splice
plate 9.
[0072] In the case of FIG. 10A, a pair of notches 12 cut inward
from the longitudinal edges of the first splice plate 9 are formed
outside the slots 10.
[0073] In the case of FIG. 10B, as shown by double-dotted lines in
FIG. 10A, the first splice plate 9 has notches 12' formed so deeply
as to cover the otherwise existing slots 10. In this example, the
independent slots 10 as shown in FIGS. 4A, 10A are not formed.
[0074] Further, in the case of FIG. 10C, a pair of trapezoidal
notches 12'' are cut inward from the longitudinal edges of the
first splice plate 9, and a plastic region 11 is formed between the
notches 12''. A wide portion having slots 10 for mounting the
anti-buckling member 13 is formed on each axial side of the plastic
region 11. In this case, the first anti-buckling member 13
preferably has a transversely inward trapezoidal protrusion 31. In
the first splice plate 9 shown in FIG. 10C, the first anti-buckling
member 13 can assume any one of the forms (1) in which it is
arranged only on the lower flange 2 of the beam 1, (2) in which it
is arranged only on the lower flange 6 of the pillar 5, and (3) in
which it is arranged over the lower flange 2 of the beam 1 and the
lower flange 6 of the pillar 5.
[0075] Also, in the example shown in FIG. 10D representing a
modification of FIG. 10C, a wide portion having slots 10 for
mounting the anti-buckling member 13 is formed on each axial side
of the plastic region 11, and each wide portion is extended with
the same width to a mounting portion having the bolt holes 28. In
this case, the diameter of each bolt hole 28 is smaller than the
diameter of the slot 10 to prevent the breakage at the mounting
portion.
[0076] In embodying the invention, a second splice plate 9' may be
arranged on one of the obverse and reverse surfaces (upper and
lower surfaces) of the lower flange 6 of the pillar 5 and the lower
flange 2 of the beam 1, and one anti-buckling member 13 may be
arranged outside the second splice plate 9'.
[0077] According to this invention, the anti-buckling member 13 is
mounted on the plastic region 11 of the splice plate 9, and
therefore can be short.
[0078] In the embodiments described above, the first and second
splice plates 9, 9' having the plastic regions 11, 11' are used to
couple the lower flange 6 of the pillar 5 and the lower flange 2 of
the beam 1 to each other. As an alternative, the first and second
splice plates 9, 9' having the plastic regions 11, 11' may be used
to couple both of the upper and lower flanges 8, 2 of the beam 1 to
the upper and lower flanges 7, 6 of the pillar 5.
[0079] Next, a third embodiment of the invention is explained with
reference to FIGS. 11 to 14B.
[0080] According to this embodiment, the pillar 5 has mounted
thereon a H-shaped bracket 40 including a web 42 in vertical
position, a lower flange 44 formed integrally along the lower edge
of the web 42, and an upper flange 46 formed integrally along the
upper edge of the web 42, and the beam 1 is coupled to the H-shaped
bracket 40. More specifically, the lower flange 2 of the beam 1 is
coupled to the lower flange 44 of the H-shaped bracket 40 through
the first splice plate 50, and the upper flange 8 of the beam 1 is
coupled to the upper flange 46 of the H-shaped bracket 40 through
the third and fourth splice plates 30, 30' having the reinforcing
ribs 20, 20', respectively, explained in the first embodiment.
According to this embodiment, the second splice plate described
above is not used.
[0081] The first splice plate 50 has substantially a configuration
similar to the first splice plate 9 shown in FIG. 10B. A pair of
trapezoidal notches 50a are cut inward from the longitudinal edges
of the first splice plate 50. A plastic region 51 is formed between
the notches 50a. An anti-buckling member 52 is arranged superposed
on the plastic region 51 of the first splice plate 50, and an
anti-sticking layer 14 of a sheet member or a film member of
synthetic rubber or the like is inserted as an anti-sticking means
between the anti-buckling member 52 and the plastic region 51.
[0082] The first splice plate 50 is arranged on the lower surfaces
of the lower flange 2 of the beam 1 and the lower flange 44 of the
H-shaped bracket 40 of the pillar 5. The third splice plate 30 is
arranged on the upper surface of the upper flange 8 of the beam 1
and the upper surface of the upper flange 46 of the H-shaped
bracket 40. Two fourth splice plates 30' are arranged on the lower
surface of the upper flange 8 of the beam 1 and the lower surface
of the upper flange 46 of the H-shaped bracket 40 on both sides of
the web 4 of the beam 1 and the web 42 of the H-shaped bracket
40.
[0083] The first, third and fourth splice plates 50, 30, 30'
arranged in this way are fastened to the lower flange 2 of the beam
1, the lower flange 44 of the H-shaped bracket 40, the upper flange
8 of the beam 1 and the upper flange 46 of the H-shaped bracket 40
by inserting the bolts 60, 62 such as high-tensile bolts into the
respective bolt holes and screwing nuts on the bolts 60, 62. In
this way, the beam 1 is coupled to the pillar 5.
[0084] Then, the anti-buckling member 52 is arranged on the plastic
region 51 on the lower surface of the first splice plate 50. Next,
the anti-buckling member 52 is mounted on the plastic region 51 of
the first splice plate 50 by inserting the bolts 63 through the
bolt holes 53 of the anti-buckling member 52 and the bolt holes 3
of the lower flange 2 of the beam 1 and screwing nuts on them. In
the process, according to this embodiment, the bolts 63 are
arranged in the immediate vicinity of, but slightly spaced from and
substantially adapted to contact, the side surface of the plastic
region 51, having been plastically deformed (FIG. 12). As a result,
the transverse deformation of the plastic region 51 is prevented or
limited. The bolts 63 may contact the side surface of the plastic
region 51 which is not plastically deformed. In short, when the
plastic region 51 is plastically deformed, the bolts 63 contact the
side surface of the plastic region 51 thereby to limit the
transverse deformation thereof.
[0085] Also, as shown in FIG. 13., an annular member 64 may be
arranged around each bolt 63 to prevent the side surface of the
plastic region 51 from contacting the side surface of the bolts 63
directly. Also, by increasing the length of the annular members 64,
longitudinal to the bolts 63, to some degree as compared with the
thickness of the plastic region 51, a space is formed between the
surface of the splice plate 50 and the opposed surface of the
anti-buckling member 52. When the plastic region 51 is plastically
deformed, this space operates as an anti-sticking means to prevent
the plastic region 51 from being pressed against and sticking to
the anti-buckling member 52.
[0086] According to this embodiment, as already described above,
the upper flange 46 of the pillar 5 and the upper flange 8 of the
beam 1 are coupled by the third and fourth splice plates 30, 30'
having the reinforcing ribs 20, 20'. As a result, the reinforcing
ribs 20, 20' bear the shearing force acting on the third and fourth
splice plates 30, 30'. As in conventional practice, therefore, the
web 42 of the H-shaped bracket 40 and the web 4 of the beam 1 are
not required to be coupled to each other by a splice plate (not
shown).
[0087] Incidentally, the upper and lower flanges 7, 6 according to
the first and second embodiments described above may be used as the
upper and lower flanges 46, 44 of the H-shaped bracket of the third
embodiment. In similar fashion, the upper and lower flanges 46, 44
of the H-shaped bracket according to the third embodiment may be
used as the upper and lower flanges 7, 6, respectively, of the
first and second embodiments. Further, the upper and lower flanges
of the pillar may be formed of split-T members 70, 72 of the cut
T-steel as shown in FIG. 15.
[0088] Furthermore, the anti-sticking means, in addition to the
anti-sticking layer 14 formed of a sheet member or a film member or
the air layer formed between the splice plate and the anti-buckling
member, may be a lubricant or a film coated on one of the surfaces
of the opposed splice plates or the anti-buckling member.
* * * * *