JP5967438B2 - Brace seismic reinforcement structure - Google Patents

Description

  The present invention relates to a brace seismic reinforcement structure, and more particularly to a joint structure between a brace and a column beam.

Conventionally, as a seismic reinforcement structure that increases the seismic strength of an existing structure, a structure including a steel brace or a damper brace in a concrete column beam structure is known (for example, see Patent Document 1).
In such a brace, the brace is arranged at a predetermined angle via the gusset plate by joining the gusset plate to the column at the corner of the column beam by welding and fixing one end of the brace to the gusset plate with a bolt. It is common that

  In Patent Document 1, a structural member or a damping brace extending from the inside sandwiched between two axial force members is fixed to two axial force members such as a column beam and a truss frame by welding on two sides of the gusset plate. For example, a configuration in which a joint end of a diagonal member is bolted to a gusset plate is disclosed.

JP 2004-324270 A

  However, in the conventional brace seismic reinforcement structure, the gusset plate is joined to the column beam by on-site welding, and work in a narrow space such as a connection portion of the column beam or work by upward welding occurs. For this reason, a high level of welding technique is required, and the work is laborious, so that the work efficiency is lowered and the quality of the welded part is also lowered, and there is room for improvement in that respect.

  There is also a method of bolting the gusset plate to the H-shaped steel web of the column beam without using welding, but in this case the yield strength is determined by the outer surface buckling of the web, etc. There was a problem that it could not be fully demonstrated.

  The present invention was made in view of the above-described problems, and can join the column beam and the brace only by bolt joining without using welding, and by reducing the labor and time required for the joining work, It is an object of the present invention to provide a brace seismic reinforcement structure that can improve work efficiency and that can fully exhibit the performance of the brace.

  To achieve the above object, the brace seismic reinforcement structure according to the present invention is a seismic reinforcement structure for braces constituted by connecting a column beam made of steel H-shaped steel and a brace. A first support plate that faces the web and is fixed by bolt joining, a pair of second support plates that are suspended from both sides of the first support plate in the width direction, and that are opposed to each other in the width direction. And a pair of connecting jigs that sandwich the both side surfaces of the column beam web by the respective first support plates by bolt joining. The connection plate is fixed, the contact plate is in contact with the flange end of the column beam, and at least the braces of the pair of connection jigs are connected to the pair of second support plates of the first support plate. A gusset plate is suspended between the two At one end of the brace to the plate it is characterized in that it is connected by a bolt.

In the present invention, an axial force composed of a compressive force and a tensile force acting on the brace can be transmitted to the column beam via the pair of connecting jigs. That is, when a compressive force is applied to the brace, the compressive force is transmitted from the first support plate of the one connecting jig provided with the gusset plate to the web of the column beam, and the flange connected to the web is connected to the flange. In addition, the compressive force is transmitted, and the compressive force is transmitted from the contact plate provided on the second support plate of the connecting jig to the flange. Further, when a tensile force acts on the brace, the pair of connecting jigs are fixed with the web sandwiched between the column beams, so the first support plate of the other connecting jig that does not include the gusset plate From the contact plate provided on the second support plate of the other connecting jig, the tensile force is transmitted to the web of the beam from the column, and the tensile force is also transmitted to the flange connected to the web. The tensile force is transmitted to the flange.
As described above, since the axial force of the brace can be efficiently transmitted not only to the web surface of the column beam but also to the flange, it is possible to eliminate the insufficient strength of the joint portion between the column beam and the brace, and to reduce the cost. Therefore, it is possible to realize a seismic reinforcement structure that can sufficiently exhibit the proof strength against the axial force of the brace.

  In addition, the connecting jig can be manufactured integrally in advance at a factory, for example, and the connecting jig and the column beam are bolted joints that do not use welding, so that welding is performed upward as in the case of welding. It is possible to reduce the difficult work such as. Therefore, it is possible to efficiently perform the joining work in a stable posture, to shorten the work period, and to suppress deterioration in the quality of the joint portion between the column beam and the connecting jig. In addition, there is an advantage that generation of noise and dust can be suppressed as compared with the joining work by welding.

  Moreover, in the brace seismic reinforcement structure according to the present invention, a first insertion member may be provided between the flange end and the contact plate.

  According to the present invention, when there is a gap between the contact plate and the flange end in a state in which the connecting jig is fixed to the column beam, the first insertion member is interposed in the gap. The axial force of the brace can be transmitted from the contact plate to the flange.

  Moreover, in the brace seismic reinforcement structure according to the present invention, a second insertion member may be provided between the web and the first support plate.

  According to the present invention, when there is a gap between the first support plate and the web in a state where the contact plates of the pair of connecting jigs are in contact with the flange end portions, the second gap is provided in the gap. By interposing the insertion member, the axial force of the brace can be transmitted from the first support plate to the web.

  According to the brace seismic reinforcement structure of the present invention, the column beam and the brace can be joined only by bolt joining without using welding, and work efficiency can be improved by reducing labor and time required for joining work. In addition, the brace performance can be fully exhibited.

It is a side view which shows a part of brace seismic reinforcement structure by embodiment of this invention. It is the sectional view on the AA line shown in FIG. FIG. 3 is a sectional view taken along line BB shown in FIG. 2. It is CC sectional view taken on the line shown in FIG. It is a perspective view of the 1st connecting jig provided with the gusset plate. It is a perspective view of the 2nd connection jig which is not provided with a gusset plate. It is the front view which looked at the 1st connecting jig shown in Drawing 5 from the tip side of a gusset plate. (A) is a horizontal sectional view showing a state in which a first insertion member is interposed between the contact plate and the flange end, and (b) is a second insertion member between the first support plate and the web. It is a horizontal sectional view which shows the state which interposed.

  Hereinafter, a brace earthquake-proof reinforcement structure according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the brace seismic reinforcement structure 1 according to the present embodiment has a surface of the frame R that resists horizontal forces such as wind and earthquakes inside the frame R composed of steel columns 2 and beams 3. A steel brace 4 for preventing internal deformation and a connecting jig 10 (10A, 10B) for connecting the steel brace 4 to the frame R are provided.
Here, the pillar 2 is made of H-shaped steel, and has a web 21 and a pair of flanges 22 and 22 as shown in FIG. In the present embodiment, the direction along the short direction of the web 21 of the column 2 is referred to as a web width direction X, and the direction along the short direction of the flange 22 is referred to as a flange width direction Y.

  The steel brace 4 is an earthquake-resistant brace installed obliquely extending inside the frame R, and in this embodiment, channel steel is used. As shown in FIG. 3, the steel brace 4 is arranged in such a direction that the direction perpendicular to the flange 4 a (the surface direction of the web 4 b) is a surface parallel to the surface of the frame R. The steel brace 4 is connected to the column 2 of the frame R via the connecting jig 10 described above.

As shown in FIGS. 2 to 6, the connecting jig 10 has a first support plate 11 that faces one side of the web 21 of the column 2 and is fixed by bolt joining, and a web width direction of the first support plate 11. A pair of second support plates 12, 12 that are suspended from both sides of X and face each other, and an abutment plate 13 that projects outward from the second support plate 12 in the web width direction X. .
The first support plate 11, the second support plate 12, and the contact plate 13 are integrally formed by welding.

  Further, the connecting jig 10 is joined by bolts 15 with the pair of connecting jigs 10 </ b> A and 10 </ b> B sandwiched on both side surfaces of the web 21 of the pillar 2 by the respective first support plates 11. Among the pair of connection jigs 10A and 10B, the first connection jig 10A to which the steel brace 4 is connected is disposed between the pair of second support plates 12 and 12 of the first support plate 11. The gusset plate 14 is suspended from the intermediate portion of the first support plate 11 in the web width direction X, and the contact plate 13 is in contact with the flange end 22 a of the column 2. The gusset plate 14 is integrated with the first support plate 11 and the second support plate 12 by welding.

  The first support plate 11 is a steel plate whose dimension in the web width direction X is smaller than the distance between the flanges 22 of the pillars 2, and at each position on both sides of the center in the web width direction X as shown in FIG. 7. Two bolt holes 11a are formed on the upper and lower sides. The web 21 of the pillar 2 is also provided with bolt holes (not shown) at positions corresponding to the four bolt holes 11a of the first support plate 11 at positions where the first support plate 11 is attached.

  The second support plate 12 is arranged with its surface direction facing the flange width direction Y, and the other end (protruding end 12 a) opposite to one end joined to the first support plate 11 is the flange end of the column 2. It protrudes outside the flange width direction Y from 22a.

  As shown in FIGS. 2, 5, and 7, the first connecting jig 10 </ b> A has the gusset plate 14 and the second support plate 12 fixed to the first support plate 11 and extends in the horizontal direction. Are joined by plate-like stiffening ribs 16. On the other hand, as shown in FIGS. 2 and 6, the second connecting jig 10 </ b> B is formed by plate-shaped stiffening ribs 16 in which the second support plate 12 is fixed to the first support plate 11 and extends in the horizontal direction. It is joined.

  As shown in FIG. 2, the contact plate 13 protrudes from the protruding end portion 12 a of the second support plate 12 toward the outside in the web width direction X and contacts toward the inside in the flange width direction Y of both side surfaces thereof. The surface 13 a is in contact with the flange end 22 a of the column 2.

  As shown in FIGS. 3 and 5, the gusset plate 14 has a shape extending from the first support plate 11 toward the direction along the longitudinal direction of the steel brace 4 (see FIG. 1) in a side view. That is, in the present embodiment, the shape is gradually inclined downward as the distance from the fixed end 14a fixed to the first support plate 11 increases. On the side of the free end 14b opposite to the fixed end 14a, a plurality of bolt holes 14c for joining one end in the longitudinal direction of the steel brace 4 by bolt joining are formed.

  In the above description, the contact plate 13 is in contact with the flange end 22a of the column 2 in a state where the first support plate 11 of the connecting jigs 10A and 10B is fixed to the web 21 of the column 2. When there is a gap between the contact plate 13 and the flange end portion 22a, a U-shaped first insertion member 17A can be interposed in a sectional view as shown in FIG. Moreover, as shown in FIG.8 (b), when there exists a clearance gap between the 1st support plate 11 and the web 21, the plate-shaped 2nd insertion member 17B can be interposed.

Next, the effect | action of the brace earthquake-proof reinforcement structure 1 mentioned above is demonstrated in detail based on drawing.
In the present embodiment, an axial force composed of a compressive force and a tensile force acting on the steel brace 4 can be transmitted to the column 2 via the pair of connecting jigs 10A and 10B. That is, when a compressive force acts on the steel brace 4, the compressive force is transmitted from the first support plate 11 of one first connecting jig 10A provided with the gusset plate 14 to the web 21 of the column 2, The compressive force is transmitted to the flange 22 connected to the web 21, and the compressive force is transmitted to the flange 22 from the contact plate 13 provided on the second support plate 12 of the connecting jig 10 </ b> A.

  Further, when a tensile force is applied to the steel brace 4, the pair of connecting jigs 10A and 10B are fixed with the web 21 sandwiched between the pillars 2, and therefore the other connection that does not include the gusset plate 14 is provided. The tensile force is transmitted from the first support plate 11 of the jig 10 </ b> B to the web 21 of the column 2, the tensile force is also transmitted to the flange 22 connected to the web 21, and the other connecting jig. The tensile force is transmitted from the contact plate 13 provided on the second support plate 12 of 10B to the flange 22.

  Thus, since the axial force of the steel brace 4 can be efficiently transmitted not only to the web surface of the column 2 but also to the flange 22, the lack of strength at the joint portion between the column 2 and the steel brace 4 is eliminated. Therefore, it is possible to realize an earthquake-resistant reinforcing structure that can sufficiently exhibit the proof strength against the axial force of the steel brace 4 at a low cost.

Further, the connecting jigs 10A and 10B can be integrally manufactured in advance at a factory, for example. That is, although each member which comprises the connection jig | tool 10 is integrally fixed by welding, it can manufacture in the work space near a factory or a field, for example, and can convey it to the attachment location of a field. And since the connection jig | tool 10A, 10B and the column 2 become bolt joining which does not use welding, work | work difficult to do work, such as upward welding like the case where welding is performed, can be decreased. Therefore, it is possible to efficiently perform the joining work in a stable posture, to shorten the work period, and to suppress the deterioration in the quality of the joint portion between the column 2 and the connecting jig 10. In addition, there is an advantage that generation of noise and dust can be suppressed as compared with the joining work by welding.
Since joining by welding is eliminated in this way, for example, even in the case of a factory filled with oil such as a newspaper factory, the joining operation can be easily performed on site.

  Moreover, in this Embodiment, as shown to Fig.8 (a), it is a clearance gap between the contact board 13 and the flange edge part 22a in the state by which the connection jig | tool 10A, 10B was being fixed to the web 21 of the pillar 2. FIG. When there is, the axial force of the steel brace 4 can be transmitted from the contact plate 13 to the flange 22 by interposing the first insertion member 17A in the gap.

  Further, in the present embodiment, as shown in FIG. 8B, the first support plate is in a state where the contact plates 13 of the pair of connecting jigs 10A and 10B are in contact with the flange end portions 22a. When there is a gap between the web 11 and the web 21, the axial force of the steel brace 4 can be transmitted from the first support plate 11 to the web 21 by interposing the second insertion member 17 </ b> B in the gap. .

  As described above, in the brace seismic reinforcement structure according to the present embodiment, the column 2 and the steel brace 4 can be joined only by bolt joining without using welding, and the labor and time required for joining work can be reduced. The working efficiency can be improved, and the performance of the steel brace 4 can be fully exhibited.

  As mentioned above, although embodiment of the brace seismic reinforcement structure by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.

  For example, in the present embodiment, the gusset plate 14 is provided only on one (first connection jig 10A) of the pair of connection jigs 10A and 10B. However, the present invention is not limited to this, and at least the steel frame is provided. A gusset plate 14 can be provided on the side having the brace 4. For example, when the steel brace 4 is provided on both sides of the pillar 2, that is, on each of the frames R on both sides of the pillar 2, the gusset plates 14 are provided on both of the pair of connecting jigs 10 </ b> A and 10 </ b> B. Can be used.

  In this embodiment, the connecting jig 10 is joined to the column 2, but it may be joined to the beam 3. In this case, the first support plate 11 is fixed to the web of the beam 3 with bolts, and the contact plate 13 is provided so as to contact the flange end portion of the beam 3, so that the axial force of the brace can be increased to the flange of the beam 3. Can be transmitted efficiently.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Brace seismic reinforcement structure 2 Column 3 Beam 4 Steel brace 10 Connection jig 11 1st support plate 12 2nd support plate 13 Contact plate 13a Contact surface 14 Gusset plate 15 Bolt 16 Stiffening rib 17A 1st insertion member 17B Second insertion member 21 Web 22 Flange 22a Flange end R Frame X Web width direction Y Flange width direction

Claims (3)

A seismic reinforcement structure for braces composed of steel beam-shaped column beams made of H-shaped steel and braces.
A first support plate facing the web of the column beam and fixed by bolting;
A pair of second support plates that are suspended from both sides in the width direction of the first support plate and face each other;
An abutment plate projecting outward from the second support plate in the width direction;
A connecting jig provided with
The pair of connecting jigs are fixed by bolting while sandwiching both side surfaces of the column beam web by the respective first support plates, and the contact plate abuts against the flange end of the column beam. Touched,
Of the pair of connecting jigs, at least the connecting jig to which the braces are connected is
A gusset plate is suspended between the pair of second support plates of the first support plate, and one end of the brace is connected to the gusset plate by a bolt. .   The brace seismic reinforcement structure according to claim 1, wherein a first insertion member is provided between the flange end and the contact plate.   The brace seismic reinforcement structure according to claim 1, wherein a second insertion member is provided between the web and the first support plate.

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