JP2009215784A - Damping frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping frame structure which can prevent a floor slab from being broken due to the deformation of a damping beam, and enables the easy and inexpensive construction of the floor slab capable of voiding repair after the occurrence of an earthquake. <P>SOLUTION: The floor slab provided adjacently to a side surface of the damping beam 2a is constituted as a unidirectional floor slab 5a the span direction of which is set as the same direction as the material axial direction of the damping beam 2a, both span-direction ends of the unidirectional floor slab 5a are pin-joined to a building frame, the damping beam 2a and the unidirectional floor slab 5a are separated from each other by a structural slit 6, and the structural slit 6 is filled with rock wool 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration control frame structure in which a vibration control beam that exhibits a vibration control effect by deformation such as a shear yield type vibration control beam is employed.

  As shown in FIG. 11, in the seismic frame structure in which the shear yield type damping beam is adopted, when the damping beam a yields and deforms at the time of the earthquake, the floor slab b attached to the damping beam a is also attached to the damping beam a. Since deformation occurs with the deformation, if the deformation angle generated after the yielding of the vibration control beam a cannot be followed, the floor slab b will be damaged, and after the earthquake, the floor slab b needs to be repaired.

  One way to avoid this inconvenience is to provide a structural slit between the damping beam and the floor slab adjacent to it to cut off the damping beam and the floor slab. Patent Literatures 1 and 2 propose a vibration control frame structure that separates the behavior.

  In the vibration control frame structure described in Patent Document 1, the floor slab in the region surrounded by the pair of large beams and the pair of vibration control beams is edged by a first slit provided between the vibration control beams and the floor. The slab is edge-cut by a second slit orthogonal to the first slit at the longitudinal center of the damping beam, and these slits are filled with an elastic filler as an expansion joint, and the first slit and the second slit The floor slab, which is edged by the slit, is configured to be supported by the jumping small beams provided on the large beams on both sides.

  By the way, the deformation of the floor slab accompanying the deformation of the damping beam is the largest in the vicinity of the damping beam, and gradually decreases as the distance from the damping beam increases. Therefore, at a position away from the damping beam to some extent, it is not greatly affected by the deformation of the damping beam, and the floor slab is not damaged.

  However, in the above-described conventional example, a second slit perpendicular to them is provided between the first slits facing each other, and the floor slab in the region surrounded by the pair of large beams and the pair of vibration control beams is the second slit. In order to support the separated cantilevered floor slab, a small beam that protrudes from the large beam on both sides toward the second slit is provided. It becomes necessary, and the construction is troublesome and the cost increases.

  In Patent Document 2, a structural slit is provided between the damping beam and the floor slab adjacent to it, and the damping beam and the floor slab are cut off to separate the behavior of the damping beam and the floor slab during earthquake. Although the seismic frame structure is described, it is not disclosed how to support the edged floor slab.

JP-A-10-3111115 JP 2003-90098 A

  The present invention has been made in consideration of the above points, and can easily and reduce a floor slab that can prevent damage to the floor slab due to deformation of the damping beam and avoid repairs after the earthquake. The purpose is to enable construction at a low cost.

The technical means taken by the present invention in order to achieve the above object are as follows. That is, the seismic control frame structure according to the first aspect of the present invention includes a seismic control beam that exhibits a seismic control effect by deformation,
A unidirectional floor slab provided adjacent to the damping beam and having the same direction as the material axis direction of the damping beam as a span direction. The damping beam and the unidirectional floor slab are edged by a structural slit. It is characterized by being.

  The invention described in claim 2 is the vibration control frame structure described in claim 1, characterized in that both ends in the span direction of the one-way floor slab are pin-joined to the building frame.

  A third aspect of the present invention is the vibration control frame structure according to the first or second aspect, wherein the structural slit for edge cutting is filled with rock wool.

  According to the first aspect of the present invention, the seismic beam that absorbs seismic energy by deformation and the floor slab adjacent to the seismic beam are separated by the structural slit, and the seismic behavior of the seismic beam and the floor slab is separated. It is possible to prevent the floor slab from being damaged due to deformation of the damping beam.

  In particular, the floor slab provided adjacent to the damping beam is a one-way floor slab whose span direction is the same as the material axis direction of the damping beam (longitudinal direction of the damping beam). The floor slab that has been cut off at both ends is in a state where both ends are supported, and it is not necessary to provide a jumping beam as in the case of supporting a cantilevered floor slab, so that the floor slab can be constructed easily and at low cost.

  According to invention of Claim 2, in addition to said effect, since the span direction both ends of the one-way floor slab are pin-joined to the frame of a building, end stress does not occur at the time of an earthquake in the slab, There is an effect that it is possible to prevent the unidirectional floor slab from being damaged by the end stress.

  According to the third aspect of the present invention, in addition to the above-described effect, the structure slit for edge cutting is filled with rock wool, so that there is an effect that the floor performance as a fireproof section can be secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a seismic control structure mainly composed of reinforced concrete (hereinafter referred to as RC structure) in which the seismic control frame structure of the present invention is employed. This seismic control building is mainly composed of an RC structure consisting of a pillar 1 rigidly joined to a lower structure A such as a foundation or an underground floor, and a beam 2 rigidly joined to the pillar 1. This is a rigid column beam B, and some of the beams in the rigid column beam frame B mainly composed of RC structures are made into short span beams. A shear yield type damping beam 2a is used, and a long-span prestressed concrete beam 3 is installed between the rigid column beam frames B and B mainly composed of opposing RC structures on the outer periphery of the building. A pillar space is formed. Note that “mainly RC structure” means that the structural type of the building structure is mainly reinforced concrete, and part of the structure may be steel or steel reinforced concrete as needed. It is.

  As shown in FIG. 2, the prestressed concrete beams 3 are arranged in two rows at the center of the building, and the two rows of prestressed concrete beams 3 are pillars 1a that support both ends of the opposing vibration control beams 2a, It is constructed between 1a.

Of the rigid column beam structure B mainly composed of RC structures, the columns 1 and the beams 2 other than the short span portion are RC structures, but the column 1a on which the short span beam (damping beam 2a) is constructed is the SRC. It is said to be made (steel-framed reinforced concrete). Further, in this embodiment, as shown in FIG. 6, the shear yield type damping beam 2a is made of S structure (steel structure), and a shear yield type using a low yield point steel for the web at the center of the beam member. The history damper is adopted. 4a is a large opening surrounded by the pillar 1 and the beam 2 other than the short span portion, and 4b is a small opening surrounded by the pillar 1a and the short-span damping beam 2a. It is blocked by an exterior material (not shown).

  In this way, the building outer frame is a rigid column beam structure B mainly composed of RC structures, and some beams in the rigid column beam structure B mainly composed of RC structures have a short span in which shearing force is easily concentrated during an earthquake. A short-span beam is used as a shear yield type damping beam 2a, while a pre-stressed concrete beam 3 is used to form a column-free space inside the building, and a rigid column beam mainly composed of RC structure. By reducing the rigidity of the frame B and promoting the deformation of the seismic control beam 2a, the ability to absorb seismic energy can be increased.

  In addition, by making the building outer frame a rigid column beam structure B mainly composed of RC structure, a large opening 4a surrounded by the pillar 1 and the beam 2 can be secured on the outer peripheral surface of the building, and sufficient light is emitted inside the building. Therefore, it is not necessary to form a large space for daylighting in the center of the building, and the space inside the building can be used effectively.

  In this embodiment, the following vibration control frame structure is applied to the floor slab around the vibration control beam 2a in the vibration control structure mainly composed of the RC structure.

  As shown in FIGS. 3 to 8, the seismic control frame structure has a floor slab provided adjacent to the side surface of the control beam 2a in the same direction as the material axis direction of the control beam 2a (longitudinal direction of the control beam). ) Is an S-structure (steel frame) unidirectional floor slab 5a with a span direction (slab support direction), and both ends of the unidirectional floor slab 5a in the span direction are pin-bonded to the building frame, and the damping beam 2a The unidirectional floor slab 5a is cut by the structure slit 6 and the structure slit 6 is filled with rock wool 7. The arrow P in FIGS. 4-6 shows the material-axis direction of the damping beam 2a, and the arrow Q in FIG.4, FIG.5, FIG.7 shows the span direction (slab support direction) of the one-way floor slab 5a.

  Specifically, as shown in FIG. 5 and FIG. 7, vibration control is applied to the opposite side surfaces of the pillar 1 a that supports both ends of the vibration control beam 2 a and the opposite side surfaces of the beams 2 and the prestressed concrete beam 3. Floor supports 8a and 8b made of angle members in a direction orthogonal to the beam 2a are attached, and both ends in the span direction of the unidirectional floor slab 5a are placed on these floor supports 8a and 8b, thereby building a building body ( For example, the two ends in the span direction of the unidirectional floor slab 5a are pin-bonded to the pillar 1a, the beam 2, the prestressed concrete beam 3, and the like.

  As shown in FIGS. 5, 7, and 8, the one-way floor slab 5a has a rising plate portion 9 on the four sides and a rectangular shape in which a plurality of spanning reinforcing angle members 10 are fixed on the upper surface. Steel plate 11. Finished concrete 12 is placed on the upper surface of the steel plate 11 to provide performance as a fireproof floor, and a reinforcing bar 13 for preventing cracks is embedded in the finished concrete 12. Although not shown, the lower surface of the steel plate 11 is provided with a fireproof coating. The finish concrete 12 is placed at the same level as the upper surface of a floor slab (a floor slab other than the one-way floor slab 5) 5b adjacent to the one-way floor slab 5a. A finish concrete 14 is also placed on the upper surface of the upper flange of the damping beam 2a at the same level as the upper surface of the finish concrete 12 of the unidirectional floor slab 5a in order to provide performance as a fireproof floor.

  A structural slit 6 for edge cutting is formed between the rising plate portion 9 along the damping beam 2a in the unidirectional floor slab 5a, the upper flange side edge of the damping beam 2a, and the finished concrete 14. And the structure slit 6 is filled with rock wool 7, and the floor performance as a fireproof section is ensured.

In the illustrated embodiment, as shown in FIG. 7, the unidirectional floor slab 5a is formed between the rising plate portions 9 at both ends in the span direction and the building frame, as shown in FIG. A structural slit 6 is also formed between the rising plate portion 9 on the opposite side of the vibration control beam 2a in 5a and the floor slab 5b, and the structural slit 6 is filled with rock wool 7. It is also possible to carry out by omitting 6. However, in this case, it is necessary to place the finished concrete 12 of the one-way floor slab 5a so as not to be integrated with the concrete of the floor slab 5b. On the floor slab 5b, the finishing concrete 12 of the unidirectional floor slab 5a, the finishing concrete 14 of the vibration control beam 2a, etc., as shown in phantom lines in FIG. 6, FIG. 7, and FIG. Is provided. As the floor finish 14, for example, an OA floor (double floor) and a carpet are used.

  According to said structure, the damage of the floor slab resulting from a deformation | transformation of the damping beam 2a can be prevented, and the floor slab which can avoid the repair after an earthquake can be constructed easily and at low cost. That is, the shear yield type damping beam 2a and the floor slab adjacent to the side surface thereof are edged by the structural slit 6 to separate the behavior of the damping beam 2a and the floor slab at the time of earthquake. Damage to the floor slab caused by deformation can be prevented.

  Moreover, since the floor slab provided adjacent to the side surface of the vibration control beam 2a is a one-way floor slab 5a having the same direction as the vibration control beam 2a as the span direction, the floor slab ( Since the unidirectional floor slab 5a) is in a state where both ends are supported and it is not necessary to provide a jumping beam as in the case of supporting a cantilevered floor slab, a floor slab provided adjacent to the vibration control beam 2a is provided. Construction can be done easily and at low cost.

  In addition, since both ends in the span direction of the one-way floor slab 5a are pin-joined to the building frame, no end stress is generated in the slab at the time of earthquake, and the one-way floor slab 5a can be prevented from being damaged by the end stress. .

  9 and 10 show another embodiment of the present invention, in that both ends in the span direction of the unidirectional floor slab 5a are placed on stepped portions 16a and 16b formed on the building frame to form pin joints. There are features. The unidirectional floor slab 5a shown in the figure is an RC structure made by concrete casting in-situ, but it may be made of precast concrete or may be an S-structure unidirectional floor slab as in the previous embodiment. Since other configurations and operations are the same as those of the previous embodiment, the same components are denoted by the same reference numerals, and description thereof is omitted.

  Note that the one-way floor slab 5a according to the present invention may be either S-structure or RC-structure as is clear through both the above-described embodiments, and may be SRC-structure (steel-reinforced concrete structure) although not shown. In addition, the unidirectional floor slab 5a in the present invention includes a deck plate, an embossed deck plate, a deck with a reinforcing bar truss that welds a reinforcing bar truss on an iron plate, etc. It may be a synthetic slab made of cast concrete.

It is a schematic front view of the seismic structure building in which the seismic structure of the present invention is adopted. It is a general | schematic cross-sectional top view of a damping structure building. It is a standard floor plan in a seismic control structure building. It is a principal part enlarged plan view of a one-way floor slab. It is a principal part enlarged plan view which shows the state before finishing concrete placement of a one-way floor slab. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a vertical side view of the principal part which shows other embodiment of this invention. FIG. 10 is a sectional view taken along line D-D in FIG. 9. It is a figure explaining a deformation | transformation of the damping beam and floor slab by an earthquake.

Explanation of symbols

A Substructure B Rigidly connected column beam structure mainly composed of RC structure P Material axis direction of damping beam Q Span direction of unidirectional floor slab (slab support direction)
1,1a Column 2 Beam 2a Damping beam (short span beam)
DESCRIPTION OF SYMBOLS 3 Prestressed concrete beam 4a Large opening 4b Small opening 5a Unidirectional floor slab 5b Floor slab 6 Structure slit 7 Rock wool 8a, 8b Floor support material 9 Standing board part 10 Reinforcement angle material 11 Steel plate 12 Finished concrete 13 Rebar for crack prevention 14 Finishing concrete 15 Floor finishing material 16a, 16b Stepped part

Claims (3)

  A seismic control beam that exhibits a seismic control effect by deformation, and a unidirectional floor slab that is provided adjacent to the seismic control beam and has a span direction that is the same as the material axis direction of the seismic control beam. Seismic control frame structure in which beam and unidirectional floor slab are edged by structural slit.   2. The seismic control frame structure according to claim 1, wherein both ends in the span direction of the unidirectional floor slab are pin-joined to the frame of the building.   The seismic response frame structure according to claim 1 or 2, wherein the structural slit for edge cutting is filled with rock wool.

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