JP4163238B2 - Column base joint - Google Patents

Description

  The present invention relates to a column base joint joint of a building.

As a column base joint connection of a building, as described in Patent Document 1, there is one that rigidly joins a column base of a building with a foundation. That is, the column base of the column is rigidly connected to the foundation, and the displacement of the intersection angle between the column and the foundation can be reduced as compared with the case of the pin connection, and the deformation of the entire building can be reduced.
JP2005-2777

  The subject of this invention is making the deformation | transformation of the whole building into the minimum in a column base joining joint.

  The invention according to claim 1 is a column base joint joint in which a horizontal member as a structural material is joined to each column base of a plurality of columns in a building structure, and each column base is joined to a lower structure. The base member is joined to the column base of at least one of the plurality of columns, and a rod pair comprising a combination of at least two rods is provided between the lower structure and the base member, and the rods are The lower ends of the rods are joined to the lower structure, the upper ends thereof are joined to the base member, the upper end intervals of the rods are made smaller than the lower end intervals, and the upper end of at least one of the rods is connected to the base member. The base member is rigidly joined to one end, the base member is tension-joined to the column base, and an introduction tension is applied between the base member and the column base.

  According to a second aspect of the present invention, in the first aspect of the present invention, the elastic member is provided on the opposite side of the column base of the base member that is tensile-bonded to the column base of the column, and both end portions of the elastic tensile member are provided. Is supported by the base member or the rod, the middle part of the elastic strut material is floated from the base member, and the middle part of the elastic strut material and the bolt inserted through the base member are tension bonded to the column base of the column. It is a thing.

  According to a third aspect of the present invention, in the second aspect of the invention, the column base to which the base member is tension-joined includes a floor beam joint piece, and the elastic strut member, the base member, the floor beam joint piece, and the joint. A bolt inserted into the floor beam in the piece is tension-bonded to the column base via a washer attached to the floor beam.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the washer is further seated via spacers at two positions on the floor beam that are separated from the bolt insertion position on both sides in the direction along the longitudinal direction of the floor beam. The washer is provided with a gap between it and the floor beam as long as it is sandwiched between both spacers.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the floor beam is a resection beam whose free end is a projecting end from the floor beam joint piece.

  The invention of claim 6 is the invention according to any one of claims 1 to 5, wherein the building structure is placed on a rigid joint between the base member and the rod. .

  According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, when a shearing force acts on the pillars of the building structure and an axial force is generated on the constituent rods of the rod pair, The bending moment Mr generated on the column base due to the axial force is opposite to the bending moment Mc generated on the column base due to the shearing force acting on the column.

  The invention of claim 8 is the invention of claim 7, wherein Mr = Mc.

  The invention of claim 9 is the invention of claim 7, wherein Mr> Mc.

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, a shearing force in the same direction as a shearing force acting on the column acts on the base member.

  According to an eleventh aspect of the present invention, in addition to the first aspect of the present invention, the lower structure is the basis.

  According to a twelfth aspect of the invention, in the invention according to any one of the first to tenth aspects, the lower structure is a lower-floor building structure.

(Claim 1)
(a) A base member is tension-bonded to a column base, and a rod pair comprising a combination of two rods is provided between the lower structure and the base member, and the two rods join their lower ends to the lower structure. At the same time, the upper ends of the two rods are joined to the base member, and the distance between the upper ends of the two rods is made smaller than the distance between the lower ends, so that the axial force of the two rods exerts a bending moment on the base member. It works to minimize the deformation of the entire building by reducing the deformation of the column (displacement of the crossing angle between the column and the foundation).

  (b) As a result of introducing tension between the column base and the base member into tension to join the base member to the column base, this introduced tension resists the peeling force that separates the column base from the base member (stripping resistance) ), The rotation of the building structure relative to the base member (the rotation of the column with respect to the vertical line, the rotation of the floor beam with respect to the horizontal line) can be reduced, and the deformation of the entire building can be stably minimized.

  (c) The length of the base member made of the cross member can be increased regardless of the position of the tensile joint point of the base member determined on the column base (including the floor beam joint piece welded to the column base). This means that the flange length f from the above-mentioned tensile joint point of the base member and the column base to the joint point of the base member and the rod can be increased, and consequently the axial force of the two rods exerts on the base member. This means that the bending moment Mr of (a) can be increased (the reason will be described later). Thereby, the deformation | transformation of the whole building can be minimized reliably.

  (d) By rigidly joining the upper ends of the base member (transverse member) and the rod (oblique member and / or vertical member), fluctuations in the shearing force Q2 acting on the base member can be avoided. Joining point r1 between the lower end of one rod and the lower structure, joining point r2 between the upper end of the rod and the base member (cross member), joining of the lower end of the other rod (diagonal member) and the lower structure Consider a point s1, a joint point s2 between the upper end of the rod and the base member (cross member). At this time, if all r1, r2, s1, and s2 are pin-joined, the bending moment Mr of the above (a) exerted on the base member by the axial force of the two rods will be large, but the strength of the building structure will be The strength of the building structure cannot be specified in advance because the shearing force Q1 acting on the column is greatly different from the ratio of Q2 described above. On the other hand, if the base member (cross member) and the upper end (r2 and / or s2) of the rod (diagonal member and / or vertical member) are rigidly connected, the bending moment Mr will not increase as much as described above. The strength is almost the same due to the ratio of Q1 and Q2, and the strength of the building structure can be specified in advance without being influenced by the plan.

(Claim 2)
(e) Both ends of the elastic strut material are supported by the base member or the rod, the middle portion of the elastic strut material is floated from the base member, and the bolt inserted through the middle portion of the elastic strut material and the base member is the pillar of the column. The base member can be tension bonded to the column base with a simple structure by being tension bonded to the leg.

(Claim 3)
(f) The column base to which the base member is tension-joined includes the floor beam joint piece, and the elastic brace, the base member, the floor beam joint piece, and the bolt inserted into the floor beam in the joint piece are It was assumed to be tension bonded to the column base via a washer attached to the beam. Therefore, the tension for pulling and joining the base member to the column base is reliably introduced between the column base and the base member.

(Claim 4)
(g) The washer is seated via a spacer at two positions on the floor beam that are separated from the bolt insertion position on both sides in the direction along the longitudinal direction of the floor beam. A gap was provided between them. Therefore, the tension for pulling and joining the base member to the column base is more reliably introduced between the column base and the base member.

(Claim 5)
(h) When the floor beam is a cut beam, the protruding end of the floor beam is open as a free end, so the rigidity of the floor beam cannot be expected, and even if a fastening force is applied to the bolt, It is difficult to ensure an effective tension between the base members, and thus a peel resistance. In the present invention, even if the floor beam is a cut beam, an effective peeling resistance can be secured between the column base (floor beam) and the base member by the introduction tension described above (g).

(Claim 6)
(i) When the building structure is placed on the rigid joint between the base member (cross member) and rod (diagonal and / or vertical member) described in (d) above, it is joined to the column base of the building structure. It is possible to strengthen the fixing degree of horizontal members (beams, girders, torches, foundations, etc.) as structural materials. When transmitting the bending moment Mr of (a) above, which the axial force of the two rods exerts on the base member, to the column base (floor beam) of the building structure, the column of the building structure and the base member of the building structure The distance of the fulcrum fulcrum (mounting point) is increased and the fulcrum reaction force is reduced (however, when the bending moment Mr is applied to the fulcrum instead of the support pressure of the building structure, the fulcrum reaction force is reduced. There is no effect, and a reaction force is applied to a separate beam fixing bolt.)

(Claim 7)
(j) When a shearing force acts on the column of the building structure and an axial force is generated on the two rods, a bending moment Mr generated on the column base due to the axial force of the two rods acts on the column. The bending moment Mc is generated in the column base due to the shearing force. Therefore, the deformation of the column due to the bending moment Mc and the deformation of the column due to the bending moment Mr cancel each other, thereby reducing the deformation of the column and minimizing the deformation of the entire building.

  (k) Since the deformation of the column can be reduced by the bending moments Mr and Mc acting on the base member as described in (a) and (j) above, the lower ends of the two rods are not rigidly joined to the lower structure, and can be simplified. Even when it is pin-joined, the deformation of the column can be reduced and the deformation of the entire building can be minimized.

(Claim 8)
(l) By setting the bending moment Mr and the bending moment Mc to Mr = Mc, the column base is rigidly connected to the lower structure (the column base does not rotate and the crossing angle between the column and the foundation does not change). Therefore, the deformation of the pillar can be reduced. There is no movement of the base member.

(Claim 9)
(m) By setting the bending moment Mr and the bending moment Mc to be Mr> Mc, the column base is deformed by Mc in the opposite direction, and becomes a super-rigid joint state. Can be less. The base member moves in the shear direction.

(Claim 10)
(n) By causing a shear force Q2 in the same direction as the shear force Q1 acting on the column to act on the base member, the fulcrum reaction force Q = Q1 + Q2 exerted by the lower structure on the two rods is increased, As a result, the axial force of the two rods can be increased, the bending moment Mr can be increased, and the effect of providing the two rods can be further improved.

(Claim 11)
(o) The above-mentioned (a) to (n) can be realized in the joint joint that is based on the lower structure and is joined to the pillar of the building structure.

(Claim 12)
(p) The above-mentioned (a) to (n) can be realized at the joint joint where the lower structure is a lower-floor building structure and the columns of the upper-floor building structure are joined to the heads or beams of the lower-floor building structure. . High rigidity can be obtained in the beam winning method.

  1 is a schematic view showing a building structure of Example 1, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a plan view of FIG. 2, FIG. 4 is a perspective view showing a column base joining frame, FIG. FIG. 6 is a schematic diagram showing a bending moment acting on a column base joint, FIG. 7 is a schematic diagram showing a frame structure of Example 2, and FIG. Is a schematic view showing the building structure of Example 3, FIG. 9 is an enlarged view of the main part of FIG. 8, FIG. 10 is a side view of the main part of FIG. 9, FIG. A washer is shown, (A) is a front view, (B) is a top view, and (C) is a bottom view.

Example 1 (FIGS. 1 to 6)
The building structure (building unit) 10 has a rectangular frame-shaped frame structure as shown in FIG. 1 to FIG. The ceiling beam 12 is rigidly joined to a joint piece 12A that is rigidly joined to the upper end of the column 11, thereby connecting the upper ends of the columns 11 and 11 and the lower end (column base 11A) of the columns 11 and 11 arranged side by side. By rigidly joining the floor beam 13 (horizontal material) to the joint piece 13A that is rigidly joined to each other, the lower ends of the columns 11 and 11 are connected.

  In the building structure 10, the column bases 11 </ b> A of the columns 11 and 11 are joined to the foundation 14 (lower structure) by the column base joint joint 20 of the column base joint mount 20 </ b> A on each of the girder face and the end face. .

Hereinafter, the column base joint 20 of the column base joint 20A will be described.
As shown in FIGS. 2 to 4, the column base joining base 20 </ b> A is a single rod disposed immediately below the column base 11 </ b> A of the column 11 provided at a corner portion where the girder surface and the wife surface of the building structure 10 are orthogonal to each other. 22A, one rod 22B arranged immediately below the floor beam 13 of each of the spar surface and the wife surface, and joined to the upper end portions of both rods 22A and 22B in each of the spar surface and the wife surface. And a base member 21 to be connected. The two rods 22 </ b> A and 22 </ b> B constitute a rod pair 22 on each of the girder face and the end face, and the upper end interval thereof is narrower than the lower end interval.

  As shown in FIG. 5, the column base joining base 20A uses a base member 21 as a horizontal member made of a steel plate, a rod 22A as a vertical member made of a square steel pipe, and a rod 22B as an oblique member made of a shape steel. Joining point r1 of the lower end of the rod 22A and the base 14, joining point r2 of the upper end of the rod 22A and one end of the base member 21, joining point s1 of the lower end of the rod 22B and the base 14, the upper end of the rod 22B and the base A joining point s2 at the other end of the member 21 is provided. At least one of the four junction points r1, r2, s1, and s2 is a rigid junction point, and the remaining junction points are pin junction points. In this embodiment, s2 is a rigid junction point, and r1, r2, and s1 are pin junction points.

  The column base joining base 20A forms the column base joint 20 as follows. Hereinafter, the girder (the same for the wife) will be described.

  (1) The column base joining base 20A is placed on the foundation 14, and a rod pair 22 comprising a combination of two rods 22A and 22B is provided between the foundation 14 and the base member 21. The two rods 22A and 22B have their lower ends (r1, s1) pin-connected to the base 14 by anchor bolts 23 and 24 (or rigid connections are possible), and the upper end (r2) of the rod 22A is welded (welding length). Is short-joined to the base member 21 (rigid joining is also possible), and the upper end (s2) of the rod 22B is rigidly joined to the base member 21 by welding (welding length is long). The distance between the upper ends of the two rods 22A and 22B is made smaller than the distance between the lower ends (the rods 22A and 22B are arranged so as to form a square shape with each other, and the upper end distance on the column 11 side is made narrower than the lower end distance on the foundation 14 side). . In this embodiment, the rod 22A on the shear front side along the direction of the horizontal shearing force Q1 acting on the column 11 is vertically arranged, and the rod 22B on the shear rear side is tilted forward.

  (2) The building structure 10 is placed on the joint between the base member 21 and the rods 22A and 22B of the column base joining base 20A. In this embodiment, the lower end plate 11B of the column base 11A is placed on the upper end plate 31 of the rod 22A, and the lower surface 13B on the free end side of the joint piece 13A is placed on the upper end plate 32 of the rod 22B. At this time, the outer distance L between the column base 11A of the building structure 10 and the joint piece 13A is made smaller than the outer distance K between the upper end plate 31 and the upper end plate 32 of the rods 22A and 22B. Further, the upper end plate 31 of the rod 22A and the upper end plate 32 of the rod 22B are located on the same level surface, and the upper surface of the base member 21 is lower than the level surface by a gap G. A gap G is formed between the lower surface of the piece 13A.

  (3) The bolt 41 is inserted into the upper end plate 31 of the rod 22A through the washer 41A, and fastened to the fastening block 41B welded to the back surface side of the lower end plate 11B of the column base 11A.

  (4) The base member 21 is tension bonded to the column base 11A of the column 11. Specifically, in the base member 21 that is tensile-bonded to the column base 11A (including the floor beam joint piece 13A welded to the column base 11A) of the column 11, the side opposite to the column base 11A (joint piece 13A) ( An elastic strut 50 is provided on the back side. The elastic strut 50 has a U shape. One end of the elastic strut 50 is supported by welding to the upper end plate 31 of the rod 22A, and the other end of the elastic strut 50 is supported by welding to the upper end of the rod 22B. The middle part of the elastic strut 50 is separated from the back surface of the base member 21 and floats. A joint that is rigidly joined to the intermediate portion of the elastic strut 50, the intermediate portion of the base member 21, and the column base 11A of the column 11 via a washer 51A (washer) in which the bolt 51 is attached to the inner surface of the floor beam 13. The piece 13A is inserted into the floor beam 13 in the joint piece 13A, and the nut 51B is fastened on the inner surface side of the floor beam 13. The bolt 51 can employ a high strength bolt. The tension introduced into the bolt 51 becomes a resistance force (a peeling resistance) against a peeling force that peels off the column base 11A from the base member 21, and the column base 11A and the base member 21 are joined so as to be elastically pulled.

Hereinafter, the support mechanism of the building structure 10 will be described (FIGS. 5 and 6).
(1) A horizontal shearing force Q1 acts on the column 11. Further, in this embodiment, a horizontal shearing force Q2 (wall load, wind pressure, etc. corresponding to the lower half of the column 11) acts on the base member 21 in the same direction as the shearing force Q1 acting on the column 11. Note that the shearing forces Q1 and Q2 are assumed to be virtually acting on one column.

  At this time, a fulcrum reaction force Q = Q1 + Q2 acts on the joint portion of the two rods 22A, 22B to the base 14.

  (2) A bending moment Mc caused by the shearing force Q1 acting on the column 11 is generated at the column base 11A (the rigid joint point with the base member 21).

  (3) Due to the fulcrum reaction force Q (Q1 + Q2) acting on the two rods 22A, 22B, axial forces Ta, Tb are generated on the rods 22A, 22B. The axial forces Ta and Tb are generated when the base member 21 is about to be moved in the shear direction by the shear forces Q1 and Q2 acting on the column 11.

  A bending moment Mr resulting from the axial forces Ta and Tb of the two rods 22A and 22B is generated at the column base 11A (the rigid joint point with the base member 21). The bending moment Mr is in the opposite direction to the bending moment Mc. The bending moment Mr lowers the upper end of the rod 22A on the shear front side, raises the upper end of the rod 22B on the shear rear side, and slightly rotates the base member 21.

  The horizontal components of the axial forces Ta and Tb are Ha and Hb, the vertical components are Va and Vb, and the arm length of the moment with respect to the column base 11A (the rigid joint point with the base member 21) of the axial forces Ta and Tb is a, b, the flange length from the junction point with the column base 11A to the junction point with the rod 22A in the base member 21 is f, the flange length to the junction point with the rod 22B is f, and the rod 22A is the base 14 When the crossing angle made with respect to θa (FIG. 6) and the crossing angle made by the rod 22B with respect to the foundation 14 is θb (FIG. 6), the following formulas (1) to (5) are established. Note that the axial force of the column 11 is ignored.

Q1 + Q2 = Ha + Hb (1)
Va + Vb = 0 (2)
Mr = Ta × a + Tb + b (3)
Mr = (Ha / cos θa) × a + (Hb / cos θb) × b (4)
a = f · sin θa, b = f · sin θb (5)

  Therefore, in order to increase the bending moment Mr, the angles θa and θb of the rods 22A and 22B are increased, the flange length f of the base member 21 is increased, and the shearing force Q2 acting on the base member 21 is increased. Is required.

  Increasing the shearing force Q2 acting on the base member 21 can be realized by receiving a floor load or wind pressure with a beam material or a trunk edge and transmitting this to the base member 21.

  In addition, when the rod 22A (22B) and the base member 21 or the base 14 are joined by pin joining, the resistance to the movement of the base member 21 is small, so the base member 21 is moved greatly and Mr is also increased. In the case of rigid joining, the resistance to movement of the base member 21 is increased, so that Mr is smaller than that of the pin joining, but the deformation of the rod 22A (22B) is very small, so that slight vibration is generated. Can be suppressed.

  (4) When Mr = Mc, the column base 11A is in a rigid connection state (the column base 11A does not rotate, the relative angle between the column 11 and the foundation 14 is unchanged). There is no movement of the base member 21.

  (5) When Mr> Mc, the column base 11A is returned in the direction opposite to the direction of deformation by Mc. This is called a super-rigid joint state. The base member 21 moves in the shearing direction (Q1 direction).

  (6) When Mr <Mc, the column base 11A is in a semi-rigid joint state (weaker than the rigid joint). The base member 21 moves in the direction opposite to the shearing direction.

  Next, the peeling prevention mechanism with respect to the column base joining frame 20A of the building structure 10 is demonstrated (FIG. 2).

  (1) The introduction tension P0 is introduced into the bolt 51 in which the elastic strut 50 attached to the back side of the base member 21 and the column base 11A (joint piece 13A) of the column 11 are tension-bonded.

(2) The distance between the bolt 51 and the pillar 11 is d1, and the distance from the pillar 11 to the farthest part of the contact between the pillar 11A (joint piece 13A) and the base member 21 via the upper end plate 32 is d2. Then, a peeling-proof force F is generated at the contact point between the column base 11A (joint piece 13A) and the base member 21 (upper end plate 32). The anti-peeling force F is caused by the lateral forces Q1 and Q2 (FIG. 5) acting on the building structure 10, causing the building structure 10 to rotate with respect to the column base joining base 20A. 11A is a resistance force to a peeling force for peeling off 11A from the base member 21 of the column base joining frame 20A, and F = P0 × (d1 / d2). For example, when P0 = 1.97 ton, d1 = 155 mm, and d2 = 250 mm, F = 1.22 ton.

  (3) Until the peeling force acting on the contact point between the column base 11A (joint piece 13A) and the base member 21 (upper end plate 32) due to the lateral force P exceeds the tear-off resistance F, the column base 11A is It is not peeled off from the base member 21.

According to the present embodiment, the following operational effects can be obtained.
(a) The base member 21 is pulled and joined to the column base 11A, and a rod pair 22 composed of a combination of two rods 22A and 22B is provided between the base 14 and the base member 21, and the two rods 22A and 22B are The lower ends of the two rods 22A and 22B are joined by joining the lower ends of the two rods 22A and 22B to the base member 14 and joining the upper ends thereof to the base member 21 and making the upper end interval of the two rods 22A and 22B narrower than the lower end interval. The axial forces Ta and Tb exert a bending moment Mr on the base member 21, and this bending moment Mr reduces deformation of the column 11 (displacement of the crossing angle between the column 11 and the foundation) and minimizes deformation of the entire building. Works.

  (b) As a result of introducing tension between the column base 11A and the base member 21 so that the base member 21 is tension-joined to the column base 11A, the introduced tension resists the peeling force that peels the column base 11A from the base member 21. The rotation of the building structure 10 with respect to the base member 21 (rotation θ of the column 11 with respect to the vertical line and rotation θ of the floor beam 13 with respect to the horizontal line) shown in FIG. Can be minimized stably.

  (c) Regardless of the position of the tensile joint of the base member 21 defined on the column base 11A (including the floor beam joint piece 13A welded to the column base 11A), the length of the base member 21 made of a cross member is set. Can be long. This means that the flange length f from the above-described tensile joint point of the base member 21 and the column base 11A to the joint point of the base member 21 and the rod 22B can be increased. As a result, the two rods 22A and 22B This means that the bending moment Mr (a) described above (a) exerted on the base member 21 by the axial forces Ta and Tb can be increased (the reason is described above). Thereby, the deformation | transformation of the whole building can be minimized reliably.

  (d) Fluctuation of the shearing force Q2 acting on the base member 21 can be avoided by rigidly joining the upper end of the base member 21 (cross member) and the rod (oblique member 22B and / or vertical member 22A). The joint point r1 between the lower end of one rod 22A and the foundation 14, the joint point r2 between the upper end of the rod 22A and the base member 21 (cross member), the lower end of the other rod 22B (diagonal material) and the foundation 14 Let us consider a joint point s1 and a joint point s2 between the upper end of the rod 22B and the base member 21 (cross member). At this time, if all r1, r2, s1, and s2 are pin-joined, the bending moment Mr of (a) described above exerted on the base member 21 by the axial forces Ta and Tb of the two rods 22A and 22B is increased. The strength of the building structure 10 differs greatly depending on the ratio of the shearing force Q1 acting on the column 11 and the above-described Q2, and the strength of the building structure 10 cannot be specified in advance. On the other hand, if the base member 21 (cross member) and the upper end (r2 and / or s2) of the rod (oblique member 22B and / or vertical member 22A) are rigidly connected, the bending moment Mr will not increase as much as described above. The strength of the structure 10 is hardly different depending on the ratio of Q1 and Q2, and the strength of the building structure 10 can be specified in advance without being influenced by the plan.

  (e) Both end portions of the elastic strut material 50 are supported by the base member 21 or the rods 22A and 22B, and an intermediate portion of the elastic strut material 50 is floated from the base member 21. The base member 21 can be tension bonded to the column base 11 </ b> A with a simple structure by tension-bonding the bolt 51 inserted into the column 21 to the column base 11 </ b> A of the column 11.

  The column base 11A to which the base member 21 is tension-joined includes the floor beam joint piece 13A, and is inserted into the elastic strut 50, the base member 21, the floor beam joint piece 13A, and the floor beam 13 in the joint piece 13A. The bolt 51 is tension-bonded to the column base 11 </ b> A via a washer 51 </ b> A attached to the floor beam 13. Accordingly, the tension for pulling and joining the base member 21 to the column base 11 </ b> A is reliably introduced between the column base 11 </ b> A and the base member 21.

  (f) When the building structure 10 is placed on the rigid joint between the base member 21 (cross member) and the rod (oblique member 22B and / or vertical member 22A) of (d), the building structure 10 The degree of fixation (of the floor beam 13) can be strengthened. When the bending moment Mr of (a) described above that the axial forces Ta and Tb of the two rods 22A and 22B exert on the base member 21 is transmitted to the column base 11A (floor beam) of the building structure 10, the column of the building structure 10 11 and the support fulcrum (mounting point) to the base member 21 of the building structure 10 is increased, and the fulcrum reaction force is reduced (however, the bending moment Mr is not the support pressure of the building structure 10; When the pulling force is applied to the fulcrum, there is no effect of reducing the fulcrum reaction force, and a reaction force is applied to a separate beam fixing bolt.

  (g) When a shearing force acts on the column 11 of the building structure 10 and the axial forces Ta and Tb are generated on the two rods 22A and 22B, the axial forces Ta and Tb of the two rods 22A and 22B are caused. Thus, the bending moment Mr generated in the column base 11A is opposite to the bending moment Mc generated in the column base 11A due to the shearing force acting on the column 11. Therefore, the deformation of the column 11 due to the bending moment Mc and the deformation of the column 11 due to the bending moment Mr cancel each other, reducing the deformation of the column 11 and minimizing the deformation of the entire building.

  (h) Since the deformation of the column 11 can be reduced by the bending moments Mr and Mc acting on the base member 21 as described above (a) and (g), the lower ends of the two rods 22A and 22B are rigidly joined to the foundation 14. Without deformation, it is possible to reduce the deformation of the column 11 and minimize the deformation of the entire building even when the pins are simply joined.

  (i) By setting the bending moment Mr and the bending moment Mc to Mr = Mc, the column base 11A is rigidly connected to the foundation 14 (the column base 11A does not rotate, and the intersection angle between the column 11 and the foundation is not displaced). ) And deformation of the pillar 11 can be reduced. There is no movement of the base member 21.

  (j) By setting the bending moment Mr and the bending moment Mc to be Mr> Mc, the column base 11A is returned to the reverse direction by Mr, and becomes a super-rigid joint state. d) can be less. The base member 21 moves in the shear direction.

  (k) A fulcrum reaction force Q = Q1 + Q2 exerted by the foundation 14 on the two rods 22A and 22B by causing a shearing force Q2 in the same direction as the shearing force Q1 acting on the column 11 to act on the base member 21. , And consequently the axial forces Ta and Tb of the two rods 22A and 22B are increased, the bending moment Mr is increased, and the effect of providing the two rods 22A and 22B can be further improved.

  (l) The above-described (a) to (k) can be realized in the joint joint 20 that uses the lower structure as the foundation 14 and joins the column 11 of the building structure 10 to the foundation 14.

Example 2 (FIG. 7)
As shown in FIG. 7, the building structure 60 has a rectangular box-framed frame structure, and is rigidly connected to the upper ends of the columns 61 and 61 that are arranged side by side in a plane orthogonal to each other in plan view. By jointing the ceiling beam 62 to the joint piece 62A, the upper ends of the columns 61 and 61 are connected, and the joint piece is rigidly joined to the lower ends (column bases 61A) of the columns 61 and 61 arranged side by side. By rigidly joining the floor beam 63 (horizontal member) to 63A, the lower ends of the columns 61 and 61 are connected.

  In the building structure 60, the column base 61A of the columns 61 and 61 is connected to the lower floor structure 70 (lower part) by the column base joint joint 20 of the column base joint mount 20A of the first embodiment in each of the girder face and the end face. Structure).

  The lower-floor building structure 70 is a rigid frame structure in which a column 71 and a beam 72 are rigidly joined, and the column base 61A of the column 61 of the upper-floor building structure 60 is joined to the beam 72 by the column base joint 20. .

  The support mechanism of the building structure 60 is substantially the same as the support mechanism of the building structure 10. Accordingly, the shearing force Q1 acts on the column 61 of the building structure 60, and the base member 21 is moved in the shearing direction by the shearing force Q1, so that the axial force Ta is applied to the two rods 22A and 22B. , Tb occurs, the bending moment Mr generated at the column base 61A (the tensile joint point with the base member 21) due to the axial forces Ta, Tb of the two rods 22A, 22B is a shear acting on the column 61. Due to the force Q1, the bending moment Mc is generated in the opposite direction to the column base 61A (tensile joint with the base member 21). The base member 21 is subjected to a shearing force Q2 in the same direction as the shearing force Q1 acting on the column 61 (wall load, wind pressure, etc. corresponding to the lower half of the column 61).

  According to the present embodiment, substantially the same functions and effects as those of the first embodiment are obtained.

Example 3 (FIGS. 8 to 12)
As shown in FIG. 8, the building structure (building unit) 110 has a rectangular frame-shaped frame structure, and the upper ends of the columns 111 and 111 arranged side by side on the long side and the short side orthogonal to each other in plan view. The ceiling beam 112 is rigidly joined to the joint piece 112A that is rigidly joined to the section, thereby connecting the upper ends of the columns 111 and 111 and rigidly joining the lower ends of the columns 111 and 111 (column base 111A). By rigidly joining the floor beam 113 (horizontal member) to the joint piece 113A, the lower ends of the columns 111 and 111 are connected.

  In the building structure 110 of the present embodiment, the front is used as the entrance or the entrance between the soils, and the joint piece 113A is rigidly joined to the column bases 111A of the columns 111 and 111 arranged side by side on the front side. The floor beams 113 that are rigidly joined to each other are used as cut beams, and the end portions of the floor beams 113 that protrude from the joint piece 113A by a certain length are used as the cut free ends.

  In the building structure 110, on each of the long side and the short side, the column bases 111A of the columns 111 and 111 are joined to the foundation 114 (lower structure) by the column base joint joint 120 of the column base joining base 120A. .

  As shown in FIGS. 9 to 11, the column base joining frame 120 </ b> A is similar to the column base joining frame 20 </ b> A of the first embodiment in that the base member 121 is a horizontal member made of a steel plate and the rod 122 </ b> A is a vertical material made of a square steel pipe. The rod 122B is an oblique material made of a shape steel.

  The column base joining base 120A forms the column base joint 120 as follows (see FIGS. 5 and 6). Hereinafter, the long side (the same applies to the short side) will be described.

  (1) The column base joining base 120A is placed on the foundation 114, and a rod pair 122 comprising a combination of two rods 122A and 122B is provided between the foundation 114 and the base member 121. The two rods 122A and 122B have their lower ends (r1, s1) pin-connected to the foundation 114 by anchor bolts 123 and 124 (rigid connection is also possible), and the upper end (r2) of the rod 122A is welded (welding length). Is short-joined to the base member 121 (or rigid joint is possible), and the upper end (s2) of the rod 122B is rigidly joined to the base member 121 by welding (welding length is long). The distance between the upper ends of the two rods 122A and 122B is made smaller than the distance between the lower ends (the rods 122A and 122B are arranged so as to form a square shape, and the upper end distance on the column 111 side is made narrower than the lower end distance on the foundation 114 side). . In the present embodiment, the shear front side rod 122A along the direction of the horizontal shearing force Q1 acting on the column 111 is vertically arranged, and the shear rear side rod 122B is tilted forward.

  (2) The building structure 110 is placed on the joint between the base member 121 and the rods 122A and 122B of the column base joining base 120A. In this embodiment, the lower end plate 111B of the column base 111A is placed on the upper end plate 131 of the rod 122A, and the lower surface 113B on the free end side of the joint piece 113A is placed on the upper end plate 132 of the rod 122B. At this time, the outer space L between the column base 111A of the building structure 110 and the joint piece 113A is made smaller than the outer space K between the upper end plate 131 and the upper end plate 132 of the rod 122A and the rod 122B. Further, the upper end plate 131 of the rod 122A and the upper end plate 132 of the rod 122B are located on the same level surface, and the upper surface of the base member 121 is lower than the level surface by a gap G. As a result, the upper surface of the base member 121 and the joint A gap G is formed between the lower surface of the piece 113A.

  (3) The bolt 141 is inserted into the upper end plate 131 of the rod 122A through the washer 141A, and fastened to the fastening block 141B welded to the back side of the lower end plate 111B of the column base 111A.

  (4) The base member 121 is tension bonded to the beam member 113 rigidly bonded to the column base 111A of the column 111. Specifically, the side opposite to the column base 111A (joint piece 113A) in the base member 121 tension-bonded to the column base 111A (including the floor beam joint piece 113A welded to the column base 111A) ( An elastic strut 150 is provided on the back side. The elastic strut 150 has a U-shape. One end of the elastic strut 150 is supported by welding to the upper end plate 131 of the rod 122A, and the other end of the elastic strut 150 is supported by welding to the upper end of the rod 122B. The intermediate portion of the elastic strut 150 is separated from the back surface of the base member 121 to have a reasonable cross section with little deformation. A joint piece 113A which is rigidly joined to the intermediate portion of the elastic strut 150, the intermediate portion of the base member 121, and the column base 111A of the column 111 via a washer 152 attached to the inner surface of the floor beam 113; The nut 151B is fastened on the inner surface side of the floor beam 113 through the floor beam 113 in the joint piece 113A. The bolt 151 can employ a high strength bolt. The tension introduced into the bolt 151 becomes a resistance force (peeling resistance) against the peeling force that peels off the column base 111A from the base member 121, and the column base 111A and the base member 121 are joined so as to be pulled elastically.

  At this time, the washer 152 is formed of a long block body as shown in FIG. 12, and a spacer 153 having a constant thickness t is integrally formed at two positions on the bottom surface separated from both sides in the direction along the longitudinal direction from the bolt insertion hole 152A. Alternatively, another part is bonded and provided (the spacer 153 may be another part that is not integrally coupled to the washer 152). When the washer 152 is attached to the inner surface of the floor beam 113, the washer 152 is separated from the insertion position (bolt insertion hole 152A) of the bolt 151 in the direction along the longitudinal direction of the floor beam 113 on both sides. The upper two positions are seated via the spacers 153, and the washer 152 is provided with a gap H (H = t) between the floor beam 113 and the spacers 153.

The support mechanism of the building structure 110 by the column base joint fitting 120 is substantially the same as the support mechanism of the column base joint joint 20 of the first embodiment. Accordingly, the shearing force Q1 acts on the column 111 of the building structure 110, and the base member 121 is moved in the shearing direction by the shearing force Q1, so that the axial force Ta is applied to the two rods 122A and 122B. , Tb occurs, the bending moment Mr generated at the column base 111A (the tensile joint point with the base member 121 ) due to the axial forces Ta, Tb of the two rods 122A, 122B is a shear acting on the column 111. Due to the force Q1, the bending moment Mc occurs in the column base 111A (the tensile joint with the base member 121 ). Note that a shearing force Q2 in the same direction as the shearing force Q1 acting on the column 111 (wall load, wind pressure, etc. corresponding to the lower half of the column 111) acts on the base member 121 .

  Hereinafter, a mechanism for preventing peeling of the building structure 110 with respect to the column base joining frame 120A, which is unique in the third embodiment, will be described (FIG. 9).

  (1) The introduction tension P0 is introduced into the bolt 151 in which the elastic strut 150 attached to the back surface side of the base member 121 and the column base 111A (joint piece 113A) of the column 111 are joined.

(2) The distance between the bolt 151 and the pillar 111 is d1, and the distance between the pillar 111A (joint piece 113A) and the base member 121 through the upper end plate 132 is the distance from the pillar 111 to the farthest point. When the contact between the column base 111A (joint piece 113A) and the spacer 153 near the column 111 of the washer 152 is d3, the column base 111A (joint piece 113A) and the base member 121 (upper end plate 132) At the contact point, a tear-off force F is generated. The anti-peeling force F causes the building structure 110 to rotate with respect to the column base joint mount 120A due to the lateral forces Q1 and Q2 (FIG. 5) acting on the building structure 110, and the column base of the building structure 110 It is a resistance force to the peeling force that peels 111A from the base member 121 of the column base joining base 120A, and F = (P0 / 2) × (d3 / d2) + (P0 / 2). For example, when P0 = 1.97 tons, d1 = 155 mm, d2 = 250 mm, and d3 = (d1 / 2) = 77.5 mm, F = 1.29 tons.

  (3) Until the peeling force acting on the contact point between the column base 111A (joint piece 113A) and the base member 121 (upper end plate 132) due to the lateral force P exceeds the peeling resistance F, the column base 111A is The base member 121 is not peeled off.

According to the present embodiment, the following operational effects can be obtained.
(a) A base member 121 is pulled and joined to the column base 111A, and a rod pair 122 composed of a combination of two rods 122A and 122B is provided between the base 114 and the base member 121. The two rods 122A and 122B The lower ends of the two rods 122A and 122B are joined to the base 114, and the upper ends thereof are joined to the base member 121 . The axial forces Ta and Tb exert a bending moment Mr on the base member 121 , and this bending moment Mr reduces deformation of the column 111 (displacement of the crossing angle between the column 111 and the foundation) and minimizes deformation of the entire building. Act

(b) the results of the column base 111A tension tensile bonding the base member 121 is introduced between the column base 111A and the base member 121, the resistance the introduction tension against peeling force peeling the pedestal 111A from the base member 121 The rotation of the building structure 110 relative to the base member 121 (rotation θ of the column 111 with respect to the vertical line and rotation θ of the floor beam 113 with respect to the horizontal line) shown in FIG. Can stably minimize the deformation of

(c) Regardless of the position of the tensile joint point of the base member 121 determined on the column base 111A (including the floor beam joint piece 113A welded to the column base 111A), the length of the base member 121 made of a cross member is set. Can be long. This means that the flange length f from the above-described tensile joining point of the base member 121 and the column base 111A to the joining point of the base member 121 and the rod 122B can be increased. As a result, the two rods 122A and 122B This means that the bending moment Mr (a) described above (a) exerted on the base member 121 by the axial forces Ta and Tb can be increased (the reason is described above). Thereby, the deformation | transformation of the whole building can be minimized reliably.

(d) By rigidly joining the upper end of the base member 121 (cross member) and the rod (oblique member 122B and / or vertical member 122A), fluctuations in the shearing force Q2 acting on the base member 121 can be avoided. Joint point r1 between the lower end of one rod 122A and the foundation 114, joint point r2 between the upper end of the rod 122A and the base member 121 (cross member), lower end of the other rod 122B (diagonal material) and the foundation 114 Let us consider a joint point s1, and a joint point s2 between the upper end of the rod 122B and the base member 121 (cross member). At this time, if all r 1, r 2, s 1, and s 2 are pin-joined, the bending moment Mr (a) exerted on the base member 121 by the axial forces Ta and Tb of the two rods 122A and 122B increases. The strength of the building structure 110 differs greatly depending on the ratio of the shearing force Q1 acting on the column 111 and the above-mentioned Q2, and the strength of the building structure 110 cannot be specified in advance. On the other hand, if the base member 121 (cross member) and the upper end (r2 and / or s2) of the rod (oblique member 122B and / or vertical member 122A) are rigidly joined, the bending moment Mr will not increase as much as described above. The strength of the structure 110 is hardly different depending on the ratio of Q1 and Q2, and the strength of the building structure 110 can be specified in advance without being influenced by the plan.

(e) both end portions of the base member 121 or the rod 122A of the elastic突張Ri member 150, supported on 122B, floated intermediate portion of the elastic突張Ri member 150 from the base member 121, an intermediate portion of the elastic突張Ri member 150 and the base member The base member 121 can be tension-bonded to the column base 111 </ b> A with a simple structure by tension-bonding the bolt 151 inserted through 121 to the column base 111 </ b> A of the column 111.

Moreover, according to the present Example, the following effects are also produced.
(f) The washer 152 is seated via spacers 153 at two positions on the floor beam 113 that are separated from the insertion positions of the bolts 151 on both sides in the direction along the longitudinal direction of the floor beam 113, and the washer 152 is sandwiched between the spacers 153. The gap H is provided between the floor beam 113 and the floor. Therefore, the tension for pulling and joining the base member 121 to the column base 111 </ b> A is more reliably introduced between the column base 111 </ b> A and the base member 121.

  (g) When the floor beam 113 is a cut beam, the projecting end of the floor beam 113 is opened as a free end, so that the rigidity of the floor beam 113 cannot be expected, and even if a fastening force is applied to the bolt 151, In addition, it is difficult to ensure effective tension between the column base 111A and the base member 121, and consequently, the peel-off resistance. In the present invention, even if the floor beam 113 is a cut beam, an effective tear-proof force can be secured between the column base 111A (floor beam 113) and the base member 121 by the introduction tension according to the above (f).

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the invention.

FIG. 1 is a schematic diagram illustrating a building structure according to the first embodiment. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a plan view of FIG. FIG. 4 is a perspective view showing the column base joining frame. FIG. 5 is a schematic diagram showing the horizontal force acting on the column base joint. FIG. 6 is a schematic diagram showing the bending moment acting on the column base joint. FIG. 7 is a schematic diagram showing the frame structure of the second embodiment. FIG. 8 is a schematic diagram showing the building structure of the third embodiment. 9 is an enlarged view of the main part of FIG. 10 is a side view of the main part of FIG. FIG. 11 is a perspective view showing the column-base joint mount FIG. 12 shows a washer, (A) is a front view, (B) is a top view, and (C) is a bottom view.

Explanation of symbols

10, 60 Building structure 11 Column 11A Column base 13, 63 Floor beam (horizontal material)
14 Foundation (substructure)
20 Column base joint 21 Base member 22 Rod pair 22A, 22B Rod 50 Elastic tension member 51 Bolt 110 Building structure 111 Column 111A Column base 113 Floor beam (horizontal material)
114 Foundation (under structure)
120 Column base connection port 121 Base member 122 Rod pair 122A, 122B Rod 150 Elastic strut material 151 Bolt 151A, 152 Washer 153 Spacer

Claims (12)

Each column base of a plurality of columns in which the building structure is lined up is joined to a horizontal member as a structural material, and each column base is connected to the lower structure.
Joining a base member to a column base of at least one of the plurality of columns;
A rod pair consisting of a combination of at least two rods is provided between the lower structure and the base member, and these rods have their lower ends joined to the lower structure and their upper ends joined to the base member. The upper end interval of the rods is narrower than the lower end interval, and the upper end of at least one of the rods is rigidly joined to one end of the base member,
The base member is joined to the column base by tension, and an introduction tension is applied between the base member and the column base.   An elastic strut material is provided on the opposite side of the base member of the base member that is tension-bonded to the column base of the column, and both ends of the elastic strut member are supported by the base member or the rod, The column base joint connection according to claim 1, wherein the intermediate portion is floated from the base member, and a bolt inserted into the intermediate portion of the elastic strut material and the base member is tension-bonded to the column base of the column.   The column base to which the base member is tension-bonded includes a floor beam joint piece, and an elastic brace, a base member, a floor beam joint piece, and a bolt inserted into the floor beam in the joint piece are attached to the floor beam. 3. The column base joint according to claim 2, wherein the column base joint is joined to the column base through an attached washer.   The washer is seated via a spacer at two positions on the floor beam that are separated from the bolt insertion position on both sides in the direction along the longitudinal direction of the floor beam, and the washer is sandwiched between the spacers within the range of both spacers. The column base joint according to claim 3, wherein a gap is provided.   5. The column base joint according to claim 4, wherein the floor beam is a cut beam having a protruding end from a joint piece for a floor beam as a free end.   The column base joint joint according to any one of claims 1 to 5, wherein the building structure is placed on a rigid joint between the base member and the rod.   When a shearing force acts on the column of the building structure and an axial force is generated on the constituent rods of the rod pair, a bending moment Mr generated on the column base due to the axial force of these rods is applied to the column. The column-base joint according to any one of claims 1 to 6, which has a direction opposite to a bending moment Mc generated in the column base due to a force.   The column base joint according to claim 7, wherein Mr = Mc.   The column base joint according to claim 7, wherein Mr> Mc.   The column base joint according to claim 9, wherein a shear force in the same direction as a shear force acting on the column acts on the base member.   The column base joint according to any one of claims 1 to 10, wherein the lower structure is a foundation.   The column base joint according to any one of claims 1 to 10, wherein the lower structure is a lower-floor building structure.

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