JP7086471B2 - Column-beam joint structure - Google Patents

Description

The present invention relates to a beam-column joint structure that can be suitably adopted in a medium-scale or large-scale wooden building or a wooden structure.

Wooden buildings are often used for detached houses, but they are also used for medium-sized or large-scale buildings such as public facilities such as meetinghouses, gymnasiums, apartment houses, and factories. In such a wooden building or a wooden structure, a rigid frame structure may be adopted for the structural frame, and the end faces of the beams are opposed to the side surfaces of the columns to be joined so that the bending moment can be transmitted. Such a joining structure may be disclosed in, for example, Patent Document 1 and Patent Document.

The joining structure disclosed in Patent Document 1 embeds a rod-shaped joining member across both the first building member and the second building member to be joined so as to cross the joining surface. The joint member is provided with a deformed portion at the position of the joint surface that is more easily deformed in the axial direction than other portions, and when a tensile force is applied to the joint member, the deformed portion yields to cause plastic deformation. It happens.
Further, in the joint structure described in Patent Document 2, tension materials are arranged on both sides of the joint surface for joining the two wood-bearing load-bearing elements, and the tension force introduced into the tension material is applied to the joint surface of the two load-bearing elements. It applies compressive force. Further, an energy dissipator that absorbs energy when a relative displacement occurs between the two load-bearing elements to be joined is provided.

Japanese Unexamined Patent Publication No. 2008-280786 Special Table 2010-500493 Gazette

However, the conventional joint structure has problems for which the following solutions are desired.
In the joining structure described in Patent Document 1, the joining member is inserted into a hole provided in the wood member, and an adhesive is injected to fix the joining member to the wood member. When a large force acts on such a joint member and the stress of the deformed portion exceeds the yield point, plastic deformation occurs, and this deformation may remain even after being unloaded. That is, the deformation may remain at the joint between the two building members, and the restoration performance is not good. The joint member is fixed to the wooden building member, and the joint member cannot be replaced, making it difficult to restore the joint portion to the state before deformation.

On the other hand, in the joining structure described in Patent Document 2, when the beam is brought into contact with the side surface of the column and joined, the end face of the beam is strongly pressed against the side surface of the column by the tension force of the tension material. A column made of wood-based material is likely to be deformed when a strong compressive force is applied from the lateral direction to the direction of the grain, and the column is also likely to be deformed by the bending moment acting on the joint between the column and the beam. Then, such deformation of the wood material may remain.

The present invention has been made in view of the above circumstances, and an object thereof is that there is little deformation that occurs in the woody part of the column and the beam, and a large force acts on the joint portion between the column and the beam to cause deformation. It is to provide a beam-column joint structure having good restoration performance even if it occurs.

In order to solve the above problems, the invention according to claim 1 is a beam made of a pillar made of wood, a pillar-side steel plate fixed to the side surface of the pillar, and a beam having one end supported by the pillar. A beam-side steel plate fixed to the end face of the beam and abutted so as to overlap the column-side steel plate, a plurality of bolts connecting the column-side steel plate and the beam-side steel plate, and the beam-side steel plate . It has a bolt receiving member whose head is abutted against a surface of the beam and has a predetermined length in the axial direction of the beam, and the head of the bolt is the bolt receiving member. Provided is a beam-column joint structure that is locked to the other end of the beam, is arranged in the axial direction of the beam, and has a tip portion bonded to the column-side steel plate .

In this beam-column joint structure, steel plates are fixed to both the joint surface between the column and the beam, and when a bending moment acts on the joint portion between the column and the beam, it acts on the end surface of the beam and the side surface of the column. The degree of compressive stress acts on the wood part via the steel plate. Therefore, the deformation of the wooden part of the beam and the column due to the degree of compressive stress can be suppressed to a small extent. As a result, even after a large bending moment is repeatedly applied, the joint surface between the column and the beam has good resilience to the state before the bending moment is applied.

Further, in this beam-column joint structure, the length of the bolt connecting the beam-side steel plate and the column-side steel plate can be adjusted by setting the length of the bolt receiving member. Therefore, it is possible to set a large length of the bolt on which the tensile force acts when the bending moment acts on the joint portion between the column and the beam, and to make the structure in which the amount of elongation of the bolt becomes large. As a result, the deformation of the joint between the column and the beam when a bending moment is applied, that is, the relative angle of rotation is set to be large, and large deformation of the entire structure is allowed without plasticizing the bolt. It is possible to make it highly tough. On the other hand, by setting the length of the bolt small, it is possible to positively plasticize the bolt when a large bending moment is applied and to effectively absorb the kinetic energy.

According to a second aspect of the present invention, in the beam-column joint structure according to the first aspect, between the beam-side steel plate and one end of the bolt receiving member, and between the head of the bolt and the other end of the bolt receiving member. It is assumed that the space is fixed so as to restrain the beam from coming off in the axial direction.

When a large bending moment repeatedly acts on the joint between the column and the beam as in the case of an earthquake, the bolt in the part on the tension side stretches, and after reaching the plastic region, the tension side may turn to the compression side. At this time, in the column-beam joint structure of the present invention, the beam-side steel plate and the column-side steel plate once separated are brought into contact with each other again, and the force of pressing the head of the bolt from the beam-side steel plate to the column side via the bolt receiving member. Works. As a result, a compressive force acts on the bolt in which plastic deformation occurs on the tensile side, and compression deformation occurs. Therefore, the stress-strain history of the bolt becomes a loop, and the energy of the vibration is absorbed to effectively attenuate the vibration.

According to the third aspect of the present invention, in the column-beam joint structure according to the second aspect, the bolt receiving member has a groove for arranging the bolt over the entire length from one end to the other end of the bolt receiving member. It has a groove lid that closes the opening of the groove while the bolt is arranged in the groove, and is arranged in the gap between the inner surface of the groove and the bolt arranged in the groove, and in the groove. It is assumed that the gap between the bolt and the groove lid is set to such an extent that buckling when a compressive force in the axial direction acts on the bolt can be suppressed.

In this column-beam joining structure, even when the beam-side steel plate is fixed to the beam and one end of the bolt receiving member is joined to the beam-side steel plate and there is not enough space behind the other end of the bolt receiving member. Bolts can be placed in the groove. Then, in a state where the beam-side steel plate and the column-side steel plate are connected by the bolt in the groove, when the compressive force acts after the plastic elongation deformation occurs in the bolt, the inner surface of the groove and the groove lid laterally. The displacement of the bolt is constrained and the buckling of the bolt is prevented.
In addition, the groove lid can be removed and the bolts can be replaced. Therefore, when the plastic deformation remains on the bolt, it can be replaced with a new bolt to restore the state before the deformation.

The invention according to claim 4 penetrates at least a part of the beam, the beam-side steel plate, the column-side steel plate, and the column in the column-beam joint structure according to any one of claims 1 to 3. It is assumed that the tensioning material is arranged in such a manner, and the degree of compressive stress is introduced into the contact surface between the beam-side steel plate and the column-side steel plate by the tensioning force introduced into the tensioning material.

In this column-beam joint structure, a pressure contact force acts between the beam-side steel plate and the column-side steel plate due to the tension force of the tension material. As a result, when the bending moment acting on the joint between the beam and the column is small, the beam-side steel plate and the column-side steel plate are suppressed from being separated from each other, and the deformation is prevented from becoming large. Then, when the bending moment acting becomes large and the beam-side steel plate and the column-side steel plate are separated from each other, the tension force of the tensioning material imparts a restoring force to the deformation between the beam and the column. ..

The invention according to claim 5 is the beam-column joint structure according to any one of claims 1 to 4, wherein one end of a plurality of rod-shaped beam-side joint members is bonded to the beam-side steel plate. The beam-side joining member protrudes from the surface of the beam-side steel plate in contact with the beam in the axial direction of the beam, and the beam-side joining member is in contact with the column-side steel plate of the beam-side steel plate. It has an adhesive filling hole that is open to the surface side and is formed in the axial direction in the beam-side joint member and leads to a discharge port provided near the tip of the beam-side joint member. With the beam-side joining member inserted into the hole drilled in the axial direction from the end face, the adhesive injected into the gap between the hole and the beam-side joining member from the filling hole of the adhesive causes the said. It is assumed that the beam-side steel plate is fixed to the beam.

In this beam-column joint structure, in a state where the beam-side steel plate is in contact with the end face of the beam, an adhesive is injected into the filling hole from the side of the beam-side steel plate that is in contact with the column-side steel plate, and a hole is provided in the beam. The adhesive can be smoothly injected between the beam side joint member and the beam side joint member. Therefore, the beam-side joint member can be fixed to the beam-side steel plate in advance, and the beam-side steel plate can be firmly fixed to the beam made of wood while keeping the surface in contact with the column-side steel plate smooth.

The invention according to claim 6 is the column-beam joint structure according to any one of claims 1 to 5, wherein the column is provided with a plurality of through holes drilled in the horizontal direction, and the through hole is provided. A rod-shaped column-side joining member is inserted into the hole, one end of the column-side joining member is twisted to the pillar-side steel plate, and the other end is twisted to the back-side steel plate abutting on the back surface of the pillar. The pillar-side joining member is formed in the axial direction from one end face or both end faces and has an adhesive filling hole having an opening on the side surface, and the pillar-side joining member is formed from the filling hole of the adhesive. It is assumed that the column-side joining member is fixed to the column with an adhesive injected between the peripheral surface of the member and the inner peripheral surface of the through hole.

In this column-beam joining structure, the column-side steel plate is firmly fixed to the column via the column-side joining member, and the column-side joining member common to the side surface to which the end face of the beam is abutted and the side surface on the back surface side thereof. Can be used to fix the steel plate. Therefore, it is possible to join other beams to the back surface side of the column in the same manner.

The invention according to claim 7 is the beam-side steel plate according to any one of claims 1 to 6, wherein the column-side steel plate projects from the lower edge portion in the axial direction of the beam. It is assumed that the beam receiving portion is in contact with the lower end surface of the.

In this beam-column joining structure, when trying to join a beam to an already erected column, the end of the beam is placed on the beam receiving part, and the bolts are attached and tightened while being temporarily supported. It can be carried out. Further, even after the beam is joined to the column, the shearing force acting on the end portion of the beam can be borne by the beam receiving portion, and the shear strength of the joint portion between the beam and the column can be increased.

As described above, in the column-beam joint structure of the present invention, there is little deformation of the woody portion of the column and the beam, and even if a large force acts on the joint portion between the column and the beam to cause deformation, the restoration performance is improved. It can have a good structure. At the same time, it is also possible to allow a predetermined deformation of the joint portion and to have a structure having high toughness or a structure having good damping performance.

It is a schematic perspective view which shows the column-beam joint structure which is one Embodiment of this invention. It is a schematic side view of the column-beam joint structure shown in FIG. It is a schematic plan view of the column-beam joint structure shown in FIG. It is an exploded perspective view which shows the structure which the column side steel plate is fixed to the column of the column-beam joint structure shown in FIG. It is a partially enlarged sectional view which shows the structure which the column side steel plate is fixed to the column of the column-beam joint structure shown in FIG. FIG. 3 is an exploded perspective view showing a structure in which a beam-side steel plate is fixed to a beam of a column-beam joint structure shown in FIG. 1 and a structure in which a bolt receiving member is fixed to a beam-side steel plate. It is a partially enlarged sectional view which shows the structure which the beam side steel plate is fixed to the beam of the column-beam joint structure shown in FIG. It is an exploded perspective view which shows the structure which connects the beam-side steel plate and the column-side steel plate of the column-beam joint structure shown in FIG. 1. It is a side view and a cross-sectional view which shows the structure which connects the beam side steel plate and the column side steel plate of the column-beam joint structure shown in FIG. It is a perspective view which shows the state which joins the beam with which the beam side steel plate is fixed, and the column with which a column side steel plate is fixed. It is a schematic side view which shows the column-beam joint structure which is another embodiment of this invention. FIG. 11 is a partially enlarged cross-sectional view of the beam-column joint structure shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing a beam-column joint structure according to an embodiment of the present invention. 2 is a schematic side view of the beam-column joint structure shown in FIG. 1, and FIG. 3 is a schematic plan view.
This column-beam joining structure is formed by joining the side surface of the pillar 1 made of wood material with the end face of the beam 2 made of wood material facing each other. The column-side steel plate 3 is fixed to the side surface to which the beam 2 of the column 1 is joined, and the beam-side steel plate 4 is fixed to the end surface of the beam. Then, the column-side steel plate 3 and the beam-side steel plate 4 are brought into contact with each other so as to overlap each other, and these are joined by bolts 5. Further, a PC steel rod 6 is arranged in the through hole 23 formed in the axial direction of the beam, and a tension force is introduced by penetrating the column 1 in the horizontal direction. Due to this tension force, the degree of compressive stress is introduced into the contact surface between the column-side steel plate 3 and the beam-side steel plate 4.

The pillar 1 has a rectangular cross-sectional shape, and is formed of laminated lumber made by laminating wood having a small cross-section. Further, the beam 2 is also made of laminated lumber, and the cross-sectional shape is a rectangle in which the beam height is larger than the width. The pillar 1 and the beam 2 are not limited to laminated lumber, and solid wood can also be used.
An insertion hole 14 for a tension material is provided in the center of the pillar 1 in the vertical direction, and the lower end of the PC steel rod 10 arranged in the insertion hole is fixed to the foundation to introduce tension.

As shown in FIG. 4, the column-side steel plate 3 is made of a rectangular steel plate whose width and height are substantially the same as the cross-sectional dimensions of the beam or slightly larger than the cross-sectional dimensions of the beam. The lower end portion is provided with a beam receiving portion 31 protruding toward the beam side so that the beam-side steel plate 4 to be abutted can be supported from below. Then, a through hole 32 for fixing the column side steel plate 3 to the column 1, a through hole 33 for inserting the PC steel rod 6, a bolt hole 34 into which a bolt 5 for connecting to the beam side steel plate 4 is screwed, and A bolt hole 35 into which a bolt for shear reinforcement is screwed is provided.

A recess corresponding to the shape and thickness of the column-side steel plate 3 is provided on the side surface of the column 1, and the column-side steel plate 3 is fixed in a state of being fitted in the recess. Further, the back side steel plate 7 is fixed on the side surface opposite to the side surface on which the pillar side steel plate 3 is fixed, and a recess corresponding to the shape and thickness of the back side steel plate 7 is provided in the same manner as the pillar side steel plate 3. It is provided and fitted in this recess. The back surface side steel plate 7 is also formed with a through hole 71 for fixing to the pillar 1 and a through hole 72 for inserting the PC steel rod 6. The column-side steel plate 3 and the back-side steel plate 7 are connected and fixed to each other by a column-side joining member 8 inserted through a through hole 11 formed in the column.

Female threads are cut on the inner peripheral surfaces of the through holes 32 formed in the column side steel plate 3 and the through holes 71 provided in the back surface side steel plate 7, and both ends of the column side joining member 8 are these through holes 32. , 71 is twisted together to connect the pillar-side steel plate 3 and the back-side steel plate 7. The column-side joining member 8 is a full-threaded steel bar in which male threads are formed over the entire length, and is fitted into a back-side steel plate 7 and a column-side steel plate 3 fitted in a predetermined position in a recess of the column 1, from one side to the column-side. The joining member 8 can be screwed into the through holes of both the back side steel plate 7 and the pillar side steel plate 3 and twisted together. Further, the column-side joining member 8 is twisted into both the back-side steel plate 7 and the column-side steel plate 3, and then is attached to the column 1 by an adhesive filled between the through holes 11 provided in the column 1. It is fixed.
The column-side joint member 8 has an outer diameter that allows male threads to be formed at both ends and the middle portion to be inserted into through holes 32 and 71 in which the female threads are formed, instead of the all-threaded steel bar. You can also use the one that became.

As shown in FIG. 5, the adhesive can be filled through the filling hole 81 provided in the axial direction from the end surface of the column side joining member 8, and the injection port 82 provided on the end surface of the column side joining member 8. Can be filled from. Then, it is possible to fill the space between the through hole 11 provided in the pillar 1 and the pillar side joining member 8 from the discharge port 83 provided on the side surface without a gap. Further, a groove 84 in the axial direction is formed on the peripheral surface at a portion of the column-side joining member 8 twisted with the column-side steel plate 3 and the back-side steel plate 7, and the adhesive 12 injected from the injection port 81 on the end surface is formed. By starting to flow out from the 84 grooves, it can be confirmed that the filling is complete.
In the example shown in FIG. 5, the adhesive is injected from both ends of the column-side joining member 8, but it may be injected from only one side.

As shown in FIG. 6, in the beam 2, the beam-side steel plate 4 is fixed to the end face by the beam-side joining member 9, and notches 21 are provided in the upper and lower portions of the end portion, and the beam side direction is axial from the end face. A hole 22 into which the beam-side joining member 9 can be inserted is formed in the hole 22. Further, a through hole 23 through which the PC steel rod 6 can be inserted is formed in the axial direction.
On the other hand, in the beam-side steel plate 4, a through hole 41 is formed at a position corresponding to the hole 22 into which the beam-side joining member 9 formed in the beam is inserted, and a female screw is cut on the inner peripheral surface. Further, a through hole 42 through which the PC steel rod 6 is inserted is formed in the substantially middle position in the vertical direction.

The beam-side joining member 9 for joining the beam-side steel plate 4 and the beam 2 is a fully-threaded steel bar having male threads formed over its entire length, and protrudes toward the beam side through a through hole 41 formed in the beam-side steel plate 4. Twisted together. Then, as shown in FIG. 7, the beam side joining member 9 is inserted into the hole 22 formed in the axial direction from the end surface of the beam 2, and the beam side steel plate 4 is in contact with the end surface of the beam 2 on the beam side. An adhesive 24 made of synthetic resin is injected between the joining member 9 and the inner peripheral surface of the hole 22 formed in the beam 2.

As shown in FIG. 7, the adhesive 24 can be injected through the filling hole 91 formed in the axial direction from the end face of the beam-side joining member 9, and is provided at the tip of the beam-side joining member 9. The adhesive 24 is filled tightly between the discharge port 93 and the beam-side joining member 9 and the inner peripheral surface of the hole 22. Further, in the beam side joining member 9, a groove 94 in the axial direction is formed in a portion twisted with the beam side steel plate 4 as in the column side joining member 8. As a result, it is confirmed that the adhesive 24 injected from the injection port 92 provided on the end surface of the beam-side joining member 9 is filled tightly between the beam-side joining member 9 and the inner peripheral surface of the hole 22. Can be done.
The beam-side joining member 9 may be a rod-shaped steel material in which male threads are formed only in the portion twisted with the beam-side steel plate 4, but all-threaded steel bars are used in order to obtain a large adhesive force with the adhesive. It is desirable to use.

As shown in FIG. 6, in order to pass bolts 5 for connecting the beam-side steel plate 4 and the column-side steel plate 3 to the upper and lower portions of the beam-side steel plate 4 at predetermined depths from the upper edge and the lower edge. The slit 43 is provided. Then, the bolt receiving member 51 is fixed to the surface of the beam side steel plate 4 on the side where the beam 2 is in contact with the position of the slit 43. The fixed bolt receiving member 51 fits in the notches 21 provided above and below the end of the beam 2.

As shown in FIGS. 8 and 9, the bolt receiving member 51 has a shape in which a part of the side surface of the cylinder is cut out, and has a substantially uniform cross section in the axial direction. Then, a groove 51b having an equal cross section is formed in the axial direction from the flat notch surface 51a toward the position of the central axis of the cylinder. The groove 51b can accommodate the bolt 5 for connecting the beam-side steel plate 4 and the column-side steel plate 3 while facing the axial direction of the bolt receiving member 51 from the open portion of the groove 51b. .. The bolt 5 has a slight gap between it and the inner surface of the groove 51b, which allows the bolt 5 to expand and contract in the axial direction and suppresses buckling of the bolt 5 in the direction perpendicular to the axial line. It is supposed to be restrained.

As shown in FIGS. 8 and 9, the bolt receiving member 51 is fixed to the beam-side steel plate 4 by a receiving member fixing bolt 52 screwed from the surface of the beam-side steel plate 4 that comes into contact with the column-side steel plate 3. Will be done. The beam-side steel plate 4 is provided with a plurality of through holes 44 through which a receiving member fixing bolt 52 can be inserted around the slit 43. Further, a plurality of bolt holes are formed on the end surface of the bolt receiving member 51 that comes into contact with the beam-side steel plate 2, and a female screw is cut on the inner peripheral surface. The bolt 52 for fixing the receiving member is inserted into the through hole 44 of the beam side steel plate 4, screwed into the bolt hole of the bolt receiving member 51 and tightened, whereby the bolt receiving member 51 can be fixed to the beam side steel plate 4. be. The surface of the beam-side steel plate 4 on the side that comes into contact with the pillar-side steel plate 3 is formed into a recess 45 by cutting the circumference of the through hole 44 through which the receiving member fixing bolt 52 is inserted into a concave shape. The head of the member fixing bolt 52 is housed in the recess 45. Therefore, with the bolt receiving member 51 fixed by the receiving member fixing bolt 52, the head of the receiving member fixing bolt 52 protrudes from the surface of the beam side steel plate 4 on the side that comes into contact with the column side steel plate 3. No, a straight elevation is maintained.

Bolt holes 51c are formed on both sides of the flat notched surface 51a, that is, the groove 51b of the bolt receiving member 51, and female threads are cut. The groove lid 54 is fixed to the bolt receiving member 51 by a plurality of groove lid fixing bolts 53 screwed into the bolt holes 51c. The groove lid 54 has a flat plate portion 54a that comes into contact with the cutout surface 51a of the bolt receiving member 51, and a protruding portion 54b that protrudes from the flat plate portion 54a and is inserted into the groove 51b. It has an almost uniform cross section in the axial direction of. The protrusion 54b has a width that can be inserted into the groove 51b of the bolt receiving member, and when the groove lid 54 is fixed to the bolt receiving member 51 by a plurality of groove lid fixing bolts 53, the tip surface thereof is bolted. It faces 5 with a slight gap. Similar to the gap between the bolt 5 and the inner surface of the groove 51b, the gap is such a gap that allows expansion and contraction of the bolt 5 in the axial direction and suppresses buckling of the bolt 5.

As shown in FIG. 8A, the bolt 5 for connecting the beam-side steel plate 4 and the column-side steel plate 3 has a plate 55 fixed to the head. The plate 55 is fixed to the head of the bolt 5 by welding or the like so as not to move in the axial direction of the bolt 5. The plate 55 is provided with a plurality of through holes 55a, and a bolt hole 51d in which a female screw is cut is formed on the inner peripheral surface at a corresponding position on the end surface of the bolt receiving member 51. Then, the plate 55 can be fixed to the end surface of the bolt receiving member 51 by the head fixing bolt 56 which is inserted into the through hole 55a of the plate and screwed into the bolt hole 51d of the bolt receiving member. ..

The beam-side steel plate 4 and the column-side steel plate 3 are joined to each other by screwing the tip of the bolt 5 into the bolt hole 34 formed in the column-side steel plate 3 and tightening the bolts 5. Further, they are pressed against each other by the tension force of the PC steel rod 6 penetrating both the beam-side steel plate 4 and the column-side steel plate 3. As shown in FIG. 2, the PC steel rod 6 has a through hole 23 in the axial direction formed in the beam 2, a through hole 42 for inserting the PC steel rod provided in the beam side steel plate 4 and the column side steel plate 3. The end portion of the PC steel rod 6 is fixed to the back side steel plate 7 by the nut 61, which is inserted into the hole 13 provided in the pillar 1 and the horizontal through hole 13 in the horizontal direction. The opposite end of the PC steel rod 6 can be anchored to the beam 2 or another column (not shown) supporting the opposite end of the beam to introduce tension. It has become a thing.

The beam 2 in which the beam-side steel plate 4 is fixed to the end face and the column 1 in which the column-side steel plate 3 is fixed to the side surface can be joined as follows.
As shown in FIG. 10, the beam-side steel plate 4 fixed to the end surface of the beam 2 is brought into contact with the column-side steel plate 3 fixed to the column 1 so as to be overlapped with each other, and the lower end surface of the beam-side steel plate 4 is brought into contact with the column side. The beam 2 is temporarily supported by being placed on the beam receiving portion 31 protruding from the lower part of the steel plate 3. At this time, the bolt receiving member 51 is fixed to the beam-side steel plate 4. Then, the temporary support bolt 57 inserted into the through hole 46 provided on the side of the portion where the beam 2 of the beam side steel plate 4 is in contact is screwed into the bolt hole 35 provided in the column side steel plate 3 and tightened. As a result, the beam 2 is temporarily fixed to the pillar 1.

In this state, as shown in FIG. 10, the bolt 5 is inserted into the groove 51b and the slit 43 of the beam-side steel plate from above or below the bolt receiving member 51, and screwed into the bolt hole 34 provided in the column-side steel plate 3. Then, the protruding portion of the groove lid 54 is inserted into the groove 51b, and the groove lid 54 is fixed to the bolt receiving member 51 by the groove lid fixing bolt 53. For the bolt 5, the beam-side steel plate 4 is tightened to the column-side steel plate 3 via the bolt receiving member 51, and the beam-side steel plate 4 and the column-side steel plate 3 are pressed against each other. After that, the plate 55 fixed to the head of the bolt 5 is fixed to the bolt receiving member 51 by the head fixing bolt 56 in a state of being pressed against the end face of the bolt receiving member 51. After the beam-side steel plate 4 and the column-side steel plate 3 are fixed by the bolt 5 in this way, the temporary support bolt 57 is pulled out, and the shear reinforcing bolt 58 is screwed in place of the temporary support bolt 57. As shown in FIGS. 1 and 2, the shear reinforcing bolt 58 has its head at a position away from the beam-side steel plate 4 with its tip screwed into the bolt hole 35 of the column-side steel plate 3. The side steel plate 4 is allowed to move in the axial direction of the shear reinforcing bolt, that is, in the direction in which the beam side steel plate 4 is separated from the column side steel plate 3.

When the beam-side steel plate 4 and the column-side steel plate 3 are joined by the bolt 5, the PC steel rod 6 is inserted into the column 1, the column-side steel plate 3, the beam-side steel plate 4, and the beam 2 as shown in FIG. Tension can be introduced by a jack attached to both ends or one end. As a result, the degree of compressive stress in the axial direction is introduced into the beam 2, and the compressive force acts between the column-side steel plate 3 and the beam-side steel plate 4.

When the beam 2 and the column 1 are joined to form a rigid frame structure in such a structure, the column 1 and the beam 2 are joined when a horizontal force that reverses the direction repeatedly acts as in an earthquake. The structure behaves as follows.
When a bending moment acts on the joint portion between the beam 2 and the column 1 due to the horizontal force, a force in the tensile direction is applied to one of the upper edge side and the lower edge side of the pressure contact surface between the beam side steel plate 4 and the column side steel plate 3 on the other. A force in the compression direction is generated. In the region on the compression side, the degree of compressive stress acting between the beam-side steel plate 4 and the column-side steel plate 3 increases. On the other hand, in the region on the tension side, the degree of compressive stress previously introduced into the pressure contact surface between the beam-side steel plate 4 and the column-side steel plate 3 is reduced. Then, when the bending moment is further increased, the bolt 5 is stretched and the beam-side steel plate 4 and the column-side steel plate 3 are separated from each other, and a gap is created. When the elongation of the bolt 5 is within the elastic range, the elongation of the bolt 5 is canceled as the direction of the bending moment is reversed, and the region on the tension side is turned to the compression side. Further, the region that was on the compression side is turned to the tension side, and the degree of compressive stress between the beam-side steel plate 4 and the column-side steel plate 3 is reduced and the bolt is stretched. Then, when the bending moment does not act, the relative positions of the beam 2 and the column 1 are restored.

When the bending moment acting on the joint portion between the beam 2 and the column 1 is large and the stress degree of the bolt 5 exceeds the yield point and becomes a plastic region, the bolt 5 undergoes plastic elongation. Then, when the acting direction of the bending moment is reversed, the bolt 5 is stretched, so that the beam-side steel plate 4 and the column-side steel plate 3 once separated are pressed again. At this time, since the head of the bolt 5 in which plastic elongation occurs is bonded to the beam-side steel plate 4 via the plate 55 and the bolt receiving member 51, the beam-side steel plate 4 is pressed against the column-side steel plate 3. Along with this, the bolt 5 is compressed and the plastic elongation is eliminated. Therefore, when the acting direction of the bending moment is repeatedly reversed, the stress-strain history of the bolt 5 becomes a loop and effectively absorbs the kinetic energy. As a result, the vibration or sway of the structure including the beam 2 and the column 1 is efficiently damped.

Further, since the PC steel rod 6 is penetrated from the beam 2 to the beam side steel plate 4, the column side steel plate 3, and the column 1 at almost the middle of the height of the beam 2 and a tension force is introduced, the bolt 5 on the tension side. Even if the beam-side steel plate 4 and the column-side steel plate 3 are separated from each other due to plastic elongation deformation, the restoring force acts due to the tension force. Therefore, it is possible to suppress the deformation of the structure and to suppress the deformation of the remaining amount after the action of the horizontal force is stopped.

On the other hand, when a large horizontal external force acts and plastic deformation remains on the bolt 5, the groove lid 54 coupled to the bolt receiving member 51 is removed, and the head fixing bolt 56 is pulled out to the head of the bolt 5. The bond between the fixed plate 55 and the bolt receiving member 51 can be released. As a result, the bolt 5 can be replaced with a new one, the residual deformation after a large horizontal force is applied can be eliminated, and the state before the deformation can be restored.

The length of the bolt 5 connecting the beam-side steel plate 4 and the column-side steel plate 3 and the length of the bolt receiving member 51 in the axial direction may be appropriately set according to the functions required for the structure and the like. can. That is, as the length of the bolt 5 increases, the amount of elongation until the stress degree of the bolt reaches the yield point and until it breaks increases. Therefore, for example, the length of the bolt is set large so that the stress level of the bolt is maintained below the elastic range, that is, the yield point, until the rotation angle generated between the beam and the column of the structure reaches the allowable limit. Can be designed. In such a design, the structure has excellent toughness, and residual deformation after deformation due to an external force is suppressed to a small extent. Also, if the length of the bolt is set small, the bolt will undergo plastic elongation before the angle of rotation generated between the beam and the column reaches the permissible limit, and the kinetic energy will occur when a load that repeatedly reverses is applied. It becomes possible to effectively absorb energy. With such a design, the damping performance of the vibration at the time of an earthquake or the like is increased.

The beam-column joint structure described above is an embodiment of the present invention, and the present invention can be carried out by appropriately changing the shape, dimensions, quantity, etc. of each part within the range.
For example, the use of PC steel rods arranged in the axial direction of the beam and PC steel rods arranged in the vertical direction in the column can be adopted depending on the conditions of the structure and the like, and these are not used. It may be a thing.
Further, in the above embodiment, the bolt 5 for connecting the beam-side steel plate 4 and the column-side steel plate 3 is screwed into the bolt hole 34 provided in the column-side steel plate 3 and tightened. As shown in the above, a structure in which the bolt 105 is directly connected to the column-side joining member 108 can also be adopted.

In this structure, a column-side joining member 108 whose both ends are twisted and connected to the column-side steel plate 103 and the back-side steel plate 107 is provided on an extension of the center line of the bolt 105. At the end of the column-side joining member 108 twisted to the column-side steel plate 103, a bolt hole is formed in the axial direction from the end face, and the bolt 105 is screwed into the bolt hole to insert the beam-side steel plate 104 into the column-side steel plate 103. It is supposed to be tightened to. As the bolt 105, the bolt receiving member 151, the groove lid 154, the beam-side steel plate 104, the beam-side joining member 109, and the like, the same structures as those shown in FIGS. 1 to 10 can be used. In such a structure, the tensile force acting on the bolt 105 from the beam 102 is directly transmitted to the column-side joining member 108, and is smoothly transmitted to the woody portion of the column 101.

The column-beam joint structure described above can also be applied to the joint structure of the column base portion for joining the columns as a foundation. That is, the foundation side steel plate is fixed to the upper surface of the foundation, and the steel plate fixed to the lower end of the column is superposed on the foundation side steel plate and joined.

1: Column, 2: Beam, 3: Column side steel plate, 4: Beam side steel plate, 5: Bolt, 6: PC steel rod,
7: Steel plate on the back side, 8: Joining member on the column side, 9: Joining member on the beam side, 10: PC steel rod placed on the column,
11: Through hole for inserting the column side joining member, 12: Adhesive, 13: Hole for inserting the PC steel rod, 14: Insertion hole for the PC steel rod arranged in the column,
21: Notch provided in the beam, 22: Hole into which the beam-side joining member is inserted, 23: Through hole through which the PC steel rod is inserted, 24: Adhesive,
31: Beam receiving part, 32: Through hole for fixing the column side steel plate to the column, 33: Through hole for inserting the PC steel rod, 34: Bolt for connecting the column side steel plate and the beam side steel plate Bolt hole to be screwed in, 35: Bolt hole to which bolt for shear reinforcement is screwed in,
41: Through hole into which the beam-side joint member is screwed, 42: Through hole through which the PC steel rod is inserted, 43: Slit for passing the bolt, 44: Through hole through which the receiving member fixing bolt is inserted, 45: Recessed , 46: Through hole through which a temporary support bolt or a bolt for shear reinforcement is inserted.
51: Bolt receiving member, 51a: Notched surface of bolt receiving member, 51b: Groove formed in bolt receiving member, 51c: Bolt hole, 51d: Bolt hole, 52: Bolt for fixing receiving member, 53: Groove lid fixing Bolt, 54: Groove lid, 54a: Flat plate part of groove lid, 54b: Protruding part of groove lid, 55: Plate fixed to the head of bolt, 55a: Through hole provided in plate, 56: Head Fixing bolts, 57: Temporary support bolts, 58: Shear reinforcement bolts,
61: Nut,
71: Through hole for connecting the back side steel plate to the column side steel plate, 72: Through hole for inserting the PC steel rod,
81: Adhesive filling hole, 82: Injection port, 83: Discharge port, 84: Groove,
91: Adhesive filling hole, 92: Injection port, 93: Discharge port, 94: Groove,
101: Column, 102: Beam, 103: Column side steel plate, 104: Beam side steel plate, 105: Bolt, 107: Back side steel plate, 108: Column side joint member, 109: Beam side joint member 151: Bolt receiving member, 154 : Groove lid

Claims (7)

Pillars made of wood and
A column-side steel plate fixed to the side surface of the column,
A beam made of wood, one end of which is supported by the pillar,
A beam-side steel plate fixed to the end face of the beam and abutted so as to be overlapped with the column-side steel plate.
A plurality of bolts connecting the column-side steel plate and the beam-side steel plate,
It has a bolt receiving member whose one end is abutted against a surface of the beam-side steel plate that is in contact with the end face of the beam and has a predetermined length in the axial direction of the beam.
The bolt has a column-beam joining structure in which a head portion is locked to the other end of the bolt receiving member, the bolt is arranged in the axial direction of the beam, and a tip portion thereof is coupled to the column-side steel plate . Between the beam-side steel plate and one end of the bolt receiving member, and between the head of the bolt and the other end of the bolt receiving member, the beam is fixed so as to restrain the detachment in the axial direction. The beam-column joint structure according to claim 1, wherein the bolts and beams are joined. The bolt receiving member has a groove for arranging the bolt over the entire length from one end to the other end of the bolt receiving member.
It has a groove lid that closes the opening of the groove with the bolt placed in the groove.
The gap between the inner surface of the groove and the bolt arranged in the groove, and the gap between the bolt arranged in the groove and the groove lid are buckled when a compressive force in the axial direction acts on the bolt. The column-beam joint structure according to claim 2, wherein the structure is set to such an extent that the above-mentioned can be suppressed. It has at least a part of the beam, the beam-side steel plate, the column-side steel plate, and a tension material arranged so as to penetrate the column.
The method according to any one of claims 1 to 3, wherein a degree of compressive stress is introduced into the contact surface between the beam-side steel plate and the column-side steel plate by the tension force introduced into the tension material. The described column-beam joint structure. One end of a plurality of rod-shaped beam-side joining members is joined to the beam-side steel plate, and the beam-side joining member protrudes from the surface of the beam-side steel plate in contact with the beam in the axial direction of the beam. ,
The beam-side joint member is opened to the surface side of the beam-side steel plate that comes into contact with the column-side steel plate, and is formed in the beam-side joint member in the axial direction, and the tip of the beam-side joint member is formed. It has an adhesive filling hole that leads to the discharge port provided in the vicinity.
An adhesive injected into the gap between the hole and the beam-side joining member through the filling hole of the adhesive in a state where the beam-side joining member is inserted into a hole formed in the axial direction from the end face of the beam. The column-beam joint structure according to any one of claims 1 to 4, wherein the beam-side steel plate is fixed to the beam. The pillar is provided with a plurality of through holes drilled in the horizontal direction.
A rod-shaped column-side joining member is inserted through the through hole, and a rod-shaped column-side joining member is inserted.
One end of the pillar-side joining member is twisted to the pillar-side steel plate, and the other end is twisted to the back-side steel plate abutting on the back surface of the pillar.
The pillar-side joining member is formed in the axial direction from one end face or both end faces, and has an adhesive filling hole having an opening on the side surface.
The pillar-side joint member is fixed to the pillar with an adhesive injected between the peripheral surface of the pillar-side joint member and the inner peripheral surface of the through hole from the filling hole of the adhesive. The column-beam joint structure according to any one of claims 1 to 5. Any of claims 1 to 6, wherein the column-side steel plate has a beam receiving portion that projects from the lower edge portion in the axial direction of the beam and is in contact with the lower end surface of the beam-side steel plate. Beam-column joint structure described in Crab.

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