JP6368534B2 - Structure - Google Patents

Description

  The present invention relates to a structure.

  There is known an artificial ground structure including an arch that supports the artificial ground and a tensile wire rod (drawing member) that connects legs of the arch (for example, see Patent Document 1).

  In the technique disclosed in Patent Literature 1, the tensile wire rod resists an outward thrust force generated in the leg portion of the arch, so that the opening between the arch leg portions is suppressed. Thereby, the bending moment which generate | occur | produces in an arch is reduced.

JP-A-5-272113

  By the way, when the thrust force generated in the frame increases with an increase in the size of the frame such as an arch, the resistance force required for the thrust force resistance member such as a tensile wire increases, which may be costly.

  In view of the above facts, the present invention aims to reduce the bending moment generated in the frame while reducing the cost.

The structure which concerns on a 1st aspect is provided with the frame by which a pair of leg part is each supported so that an outer displacement is possible, and the thrust force resistance member which supports a vertical load while connecting a pair of said leg part.

According to the structure which concerns on a 1st aspect , a pair of leg part of a frame is connected by the thrust force resistance member. The thrust force resistance member resists the outward thrust force generated in each of the pair of leg portions, thereby reducing the opening between the pair of leg portions. As a result, the bending moment generated in the frame with the opening between the pair of legs is reduced.

  The thrust force resistance member supports a vertical load. Thereby, for example, a pulling force that pulls the pair of legs of the frame inward can be generated in the thrust force resistance member. By increasing the resistance force of the thrust force resistance member by this pulling force, the opening between the pair of legs is further reduced. Thereby, the bending moment which generate | occur | produces in a frame with the opening between a pair of leg parts becomes still smaller. Therefore, since bending reinforcement etc. with respect to a frame are reduced, the construction cost of a frame can be reduced.

  As another example, the material cost can be reduced by using the thrust force resistance member as a support member for supporting a floor, equipment or the like.

  Thus, in the present invention, the bending moment generated in the frame can be reduced while reducing the cost.

The structure according to the second aspect is the structure according to the first aspect , wherein the thrust force resistance member is disposed below the upper chord member that is installed on the pair of leg portions, and below the upper chord member. A lower chord member having a convex shape, and a bundle member that connects the upper chord member and the lower chord member in a vertical direction.

According to the structure according to the second aspect , the upper chord material is installed on the pair of legs of the frame. A lower chord material is disposed below the upper chord material. The upper chord member and the lower chord member are connected in the vertical direction by a bundle member.

  Here, the lower chord material has a convex shape downward. Therefore, when a thrust force (tensile force) acts on the lower chord material from the pair of leg portions of the frame, the lower chord material expands, and the upper chord material is pushed upward through the bundle material as the lower chord material extends. Thereby, since the deflection etc. of the whole thrust force resistance member become small, the bending reinforcement etc. with respect to a thrust force resistance member can be reduced. Therefore, the material cost of the thrust force resistance member can be reduced.

The structure according to a third aspect is the structure according to the first aspect or the second aspect , wherein the frame is a roof frame, and the thrust force resistance member supports a floor.

According to the structure which concerns on a 3rd aspect , the construction cost of a floor can be reduced by using a thrust force resistance member as a supporting member which supports a floor.

  As described above, according to the structure according to the present invention, the bending moment generated in the frame can be reduced while reducing the cost.

It is an elevation which shows the structure concerning one embodiment of the present invention. (A) is a model figure which shows the structure of FIG. 1, (B) is a model figure which shows the modification of the structure of FIG. (A)-(C) are side views which show the modification of the thrust force resistance member shown by FIG. (A) And (B) is a side view which shows the modification of the thrust force resistance member shown by FIG. (A)-(D) are elevations which show the modification of the roof frame shown by FIG. (A)-(C) are perspective views which show the modification of the roof frame shown by FIG. (A) And (B) is a perspective view which shows the modification of the thrust force resistance member shown by FIG. It is a model figure which shows the modification of the support structure of the roof frame shown by FIG.

  Hereinafter, a structure according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a structure 10 according to the present embodiment. The structure 10 is used as, for example, a concert hall, a multipurpose hall for performing various events, a gymnasium, a stadium, and the like. The structure 10 includes a roof frame 12, a seismic isolation device 20, a foundation 22, and a thrust force resistance member 30.

  The roof frame 12 is formed in a substantially triangular shape that protrudes upward as a whole, and an internal space 14 is formed inside thereof. The roof frame 12 has a pair of diagonal beams 16 extending from the top 12T to both sides. The pair of diagonal beams 16 are inclined downward from the top 12T of the roof frame 12 toward the outside, and support a roof material such as a folded plate (not shown).

  The roof frame 12 is applied with a base isolation structure (roof isolation). Specifically, the pair of leg portions 12 </ b> L of the roof frame 12 is supported by the foundation 22 via the seismic isolation device 20. That is, the pair of leg portions 12L of the roof frame 12 is supported by the foundation 22 so as to be displaceable outward (in the direction of arrow F) and inward (in the direction of arrow P). In the present embodiment, a pair of leg portions 12 </ b> L of the roof frame 12 is configured by the lower portions of the pair of diagonal beams 16.

  The seismic isolation device 20 is a laminated rubber bearing. The seismic isolation device 20 is not limited to a laminated rubber bearing, and may be a sliding bearing or a rolling bearing. The upper flange portion of the seismic isolation device 20 is fixed to the leg portion 12L of the roof frame 12 via anchors, bolts, or the like (not shown). On the other hand, the lower flange portion of the seismic isolation device 20 is fixed to the foundation 22 via an anchor or the like (not shown) or a bolt. The foundation 22 is formed by, for example, a foundation slab, a foundation beam, or a footing.

  The thrust force resistance member 30 is formed of a long beam-like member. The thrust force resistance member 30 is disposed between the pair of leg portions 12L of the roof frame 12, and connects the pair of leg portions 12L. Here, the pair of legs 12L of the roof frame 12 has an outward thrust force F to open outward due to the load G of the roof material 12 (not shown) such as the weight G of the roof frame 12 or a folded plate. Will occur. As the thrust force resistance member 30 resists the thrust force F, the opening between the pair of leg portions 12L is suppressed.

  Further, the thrust force resistance member 30 also functions as a support member that supports the floor 18 of the internal space 14. Specifically, the floor 18 is formed on the thrust force resistance member 30. The floor 18 is made of, for example, reinforced concrete, and extends from one end of the thrust force resistance member 30 to the other end. A vertical load V is applied to the thrust force resistance member 30 by the floor 18. In other words, the thrust force resistance member 30 supports the vertical load V of the floor 18. Then, due to the vertical load V of the floor 18 and the weight of the thrust force resistance member 30, a pulling force P that pulls the pair of leg portions 12 </ b> L inward is generated at both ends of the thrust force resistance member 30.

  Next, the operation of this embodiment will be described.

  According to the present embodiment, the roof frame 12 has a pair of leg portions 12 </ b> L supported by the foundation 22 via the seismic isolation device 20. Thereby, the vibration period of the roof frame 12 and the floor 18 supported by the roof frame 12 at the time of the earthquake is lengthened. Therefore, since the seismic force generated on the roof frame 12 and the floor 18 is reduced, the roof frame 12 is prevented from being damaged or damaged.

  Here, in FIG. 2A, a model diagram of the structure 10 is shown. As shown in FIG. 2A, an outward thrust force F is generated on the pair of legs 12L of the roof frame 12 due to the load G of the roof frame 12 due to its own weight G or a roof material (not shown). To do. When the pair of legs 12L are opened outward by the thrust force F as shown by the two-dot chain line, the bending moment M generated in the pair of diagonal beams 16 increases, and bending reinforcement for the pair of diagonal beams 16 is performed. May increase. In particular, in this embodiment, since the pair of leg portions 12L of the roof frame 12 is supported by the seismic isolation device 20, the pair of leg portions 12L are easily opened outward, and the bending moment M generated in the pair of diagonal beams 16 is generated. Easy to grow.

  As a countermeasure, in this embodiment, the pair of leg portions 12L of the roof frame 12 are connected by a thrust force resistance member 30. The thrust force resistance member 30 resists the thrust force F due to its rigidity, thereby reducing the opening between the pair of leg portions 12L. As a result, the bending moment M generated in the roof frame 12 with the opening between the pair of leg portions 12L is reduced. Therefore, since the bending reinforcement etc. with respect to the roof frame 12 are reduced, the construction cost of the roof frame 12 can be reduced.

  Further, the thrust force resistance member 30 supports the vertical load V of the floor 18. Due to the vertical load V and the weight of the thrust force resistance member 30, the thrust force resistance member 30 tends to bend downward so that the pair of leg portions 12 </ b> L are pulled inward at both ends of the thrust force resistance member 30. Retraction force P is generated. By increasing the resistance force of the thrust force resistance member 30 by the pulling force P, the opening between the pair of leg portions 12L is further reduced. Therefore, the bending moment M generated in the roof frame 12 can be further reduced.

  On the other hand, since the thrust force F acts as a tensile force on the thrust force resistance member 30 from the pair of leg portions 12L, the deflection or the like is reduced. Therefore, the thrust force resistance member 30 can be made long span. In addition, since bending reinforcement of the thrust force resistance member 30 is reduced, the material cost of the thrust force resistance member 30 can be reduced. Further, by making the thrust force resistance member 30 long span, it is possible to reduce or eliminate the support materials (foundations and piles) that support the intermediate portion of the thrust force resistance member 30 and reduce the cost.

  Further, in this embodiment, the thrust force resistance member 30 is used as a support member that supports the floor 18. Therefore, the material cost of the floor 18 can be reduced.

  Thus, in this embodiment, the bending moment M generated in the roof frame 12 can be reduced while reducing the cost.

  As another method for increasing the resistance force of the thrust force resistance member 30 against the thrust force F, for example, it is conceivable to increase the rigidity by reinforcing the thrust force resistance member 30. However, this can be laborious and costly.

  On the other hand, in this embodiment, the pulling force P can be increased by increasing the vertical load V applied to the thrust force resistance member 30, that is, the weight of the floor 18. Therefore, the resistance force of the thrust force resistance member 30 against the thrust force F can be easily increased.

  Further, for example, before and after the roof material such as a folded plate is installed on the roof frame 12, the thrust force F generated in the pair of leg portions 12L is greater after the roof material is installed on the roof frame 12. In response to such an increase in the thrust force F, for example, the floor 18 is constructed and the vertical load V applied to the thrust force resistance member 30 is increased, thereby reducing the opening (interval) between the pair of leg portions 12L. Can do. Therefore, the workability of the roof frame 12 is improved.

  As another method for adjusting the retracting force P of the thrust force resistance member 30, for example, as shown in FIG. 2B, the longitudinal intermediate portion of the thrust force resistance member 30 is roller-supported by the support member 24. By doing so, a method of reducing the vertical load V supported by the thrust force resistance member 30 can be mentioned. In this case, the support member 24 may be temporary or permanent.

  Next, a modified example of the thrust force resistance member 30 will be described.

  As shown in FIG. 3A, the thrust force resistance member 40 may be formed of, for example, a beam-shaped member (truss beam) having a truss structure. Specifically, the thrust force resistance member 40 includes a plurality of upper chord members 42 and lower chord members 44 laid on a pair of legs 12L of the roof frame 12, and a plurality of upper chord members 42 and lower chord members 44. A bundle member 46 and a diagonal member 48 are provided. Thus, by making the thrust force resistance member 40 a truss structure, it is possible to achieve a long span of the thrust force resistance member 40 while reducing the weight.

  For the thrust force resistance member 40, for example, various truss structures such as a feeler deal can be adopted. In the modification shown in FIG. 3A, the thrust force resistance member 40 and the base portion 26 of the structure 10 are connected by a damping device 50 such as a damper, and the vibration of the thrust force resistance member 40 is reduced. Has been reduced. As described above, the thrust force resistance member 40 may be provided with the vibration damping device 50.

  Further, for example, as shown in FIG. 3B, the lower chord material 54 of the thrust force resistance member 52 may be curved so as to protrude downward. In this case, when a thrust force (tensile force) F acts on the lower chord member 54 from the pair of leg portions 12L of the roof frame 12, the lower chord member 54 extends, and the lower chord member 54 extends along with the bundle member 46. The upper chord material 42 is pushed upward (in the direction of arrow a). Thereby, since the deflection etc. of the thrust force resistance member 52 as a whole are reduced, bending reinforcement or the like for the thrust force resistance member 52 can be reduced. Therefore, the material cost of the thrust force resistance member 52 can be reduced.

  In addition, the lower chord material 54 should just be connected with the upper chord material 42 via the bundle material 46 grade | etc., And does not necessarily need to be constructed by a pair of leg part 12L of the roof frame 12. FIG. Further, as in the thrust force resistance member 56 shown in FIG. 3C, the lower chord material 58 can be formed of a wire material such as a PC steel wire or a wire rope. In addition, the upper chord material of a normal truss where thrust force does not work requires a large cross section that does not buckle because compressive force works. On the other hand, when a thrust force acts on the upper chord material, the compressive force acting on the upper chord material can be reduced or eliminated, whereby the cross-section can be reduced using a high-strength material and the cost can be reduced.

  Next, although the example which supports the vertical load V of the floor | bed 18 with the thrust force resistance member 30 was shown in the said embodiment, it does not restrict to this. For example, as shown in FIG. 4A, a vertical load V (loading load) of various equipment 38, wiring, piping, water tank, etc. may be supported by a thrust force resistance member 40. In the modification shown in FIG. 4A, the installation space for the equipment 38 is secured by omitting the diagonal material 48 at the center of the thrust force resistance member 40.

  Further, for example, as shown in FIG. 4B, the floor slab 62 may be supported by a thrust force resistance member 60 formed of a wire such as a PC steel wire or a PC steel rod. Specifically, the thrust force resistance member 60 is installed on the pair of legs 12 </ b> L of the roof frame 12. The thrust force resistance member 60 is inserted into a through hole 64 of a floor slab 62 formed of spun cleat or the like, and supports the vertical load V of the floor slab 62. In this case, the pulling force P generated in the thrust force resistance member 60 can be adjusted by increasing or decreasing the thickness of the floor slab 62 or the like.

  Although not shown, the thrust force resistance member may support various vertical loads such as building materials such as pillars, squares, fields, and weights, for example. Further, for example, the pulling force generated in the thrust force resistance member may be increased by increasing the cross-sectional area of at least a part of the thrust force resistance member and increasing the weight of the thrust force resistance member.

  Next, a modified example of the roof frame 12 will be described.

  As shown in FIG. 5A, in the above embodiment, the example in which the roof frame 12 is formed in a substantially triangular shape is shown, but the present invention is not limited to this. The roof frame 12 only needs to be a frame type in which an outward thrust force F is generated in the pair of leg portions 12L, and the shape, structure, and the like can be appropriately changed. For example, as shown in FIG. 5B, the pair of leg portions 70L of the roof frame 70 may be formed in a substantially vertical column shape. Further, as shown in FIG. 5C, the central portion of the roof frame 72 may be configured with a beam 74 extending in the horizontal direction. Furthermore, as shown in FIG. 5D, the roof frame 76 may be formed in an arcuate arch shape.

  5A to 5D, the thrust force resistance member that connects the pair of leg portions 12L, 70L, 72L, 74L, and 76L of the roof frames 12, 70, 72, 74, and 76 is illustrated. Is omitted.

  Further, as shown in FIG. 6A, a plurality of roof frames 12 may be arranged substantially in parallel. As shown in FIG. 6B, a plurality of roof frames 12 are crossed to form a three-dimensional frame. It is also good. Furthermore, as shown in FIG. 6C, a plurality of arch-shaped roof frames 76 may be crossed to form a dome-shaped frame. In this case, the tension ring 78 provided on the outer periphery of the dome-shaped frame corresponds to a thrust force resistance member. Furthermore, the above-described embodiment is not limited to the roof frame 12 and can be applied to various frames such as a frame and a bridge that constitute an intermediate layer of the structure.

  The thrust force resistance member may be appropriately changed according to the shape of the roof frame. For example, as shown in FIG. 7A, a plurality of thrust force resistance members 40 may be arranged substantially in parallel. However, as shown in FIG. 7B, a plurality of thrust force resistance members 40 may be crossed (substantially orthogonal). Further, the thrust force resistance member is not limited to the inside (below) of the roof formed by the roof frame, and may be disposed outside the roof.

  Moreover, although the example which supported the roof frame 12 with the seismic isolation apparatus 20 was shown in the said embodiment, it is not restricted to this. For example, as shown in FIG. 8, the pair of legs 12 </ b> L may be supported by pillars 28. In this case, the column 28 tilts to the left and right, so that the pair of leg portions 12L are displaced outward and inward.

  Moreover, in the said embodiment, although the example which supported the pair of leg parts 12L of the roof frame 12 so that displacement to the inner side and the outer side was shown, the pair of leg parts 12L should just be supported so that it can displace to the outer side at least. . In other words, the roof frame 12 only needs to be supported so that at least the pair of leg portions 12L can be displaced in directions away from each other.

  Note that the leg 12L of the roof frame 12 is not limited to the lower part of the pair of diagonal beams 16, and includes a support such as a footing interposed between the pair of diagonal beams 16 and the seismic isolation device 20, for example. . Therefore, for example, when the pair of diagonal beams 16 is supported by the seismic isolation device 20 via the footing, the pair of footings may be connected by a thrust force resistance member. Further, in the case where a plurality of roof frames are arranged substantially in parallel, one support body that supports one leg portion of the plurality of roof frames and another one that supports the other leg portion of the plurality of roof frames. Two supports may be connected by a thrust force resistance member.

  In the above-described embodiment, the example in which the pulling force P is generated in the thrust force resistance member 30 by the vertical load V of the floor 18 is shown, but the present invention is not limited thereto. For example, the thrust force resistance member can be used (supported) as a support member such as a floor without generating a pull-in force due to a vertical load such as a floor or without expecting a pull-in force. In this case, the cost of materials such as floors can be reduced.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

10 Structure 12 Roof frame (frame)
12L leg (frame leg)
18 Floor (Vertical load)
30 Thrust force resistance member 38 Equipment (Vertical load)
40 Thrust force resistance member 42 Upper chord material 46 Bundle material 52 Thrust force resistance member 54 Lower chord material 58 Lower chord material 60 Thrust force resistance member 70 Roof frame (frame)
70L leg (frame leg)
72 Roof frame (frame)
72L leg (frame leg)
76 Roof frame (frame)
76L leg (frame leg)
78 Tension ring (Thrust force resistance member)
V Vertical load

Claims (4)

A roof frame supported by the seismic isolation device so that the pair of legs can be displaced outwardly,
A thrust force resistance member for connecting the pair of legs and supporting a vertical load;
A structure comprising The thrust force resistance member is
An upper chord material constructed between the pair of legs,
A lower chord material which is arranged on the lower side of the upper chord material and has a convex shape downward;
A bundle member that connects the upper chord member and the lower chord member in the vertical direction;
Having
The structure according to claim 1. Before Symbol thrust resistance member supports the floor,
The structure according to claim 1 or claim 2. The roof frame has a width that decreases toward the top,
The structure according to any one of claims 1 to 3.