JP4745055B2 - Reinforced concrete shear wall - Google Patents

Description

  The present invention relates to a reinforced concrete earthquake resistant wall, and more particularly to a reinforced concrete earthquake resistant wall that requires high toughness.

  Conventionally, the structure shown in FIG. 3 is used as a reinforcement structure of a reinforced concrete earthquake-resistant wall. In the structure shown in FIG. 3, a plurality of vertical bars 12 erected along the front and back surfaces of the reinforced concrete seismic wall 11, and a plurality of horizontal bars 13 that form a lattice with the vertical bars 12 and are arranged over the wall width. A plurality of out-of-plane reinforcing bars 14 that are bent back at both ends and spanned between the vertical bars 12 in the wall thickness direction are arranged.

  When a building receives a seismic force, bending and shearing force acts on the seismic wall 11 and a compressive force is partially input, the seismic wall 11 tends to deform so as to spread in its thickness direction (out-of-plane direction). . When the seismic force increases and the compressive force increases and this deformation becomes significant, the seismic wall 11 is brittle and loses its horizontal strength. The out-of-plane reinforcing bars 14 serve to enhance the deformation performance of the earthquake-resistant wall 11 by constraining this deformation, and improve its toughness performance.

In addition, in a reinforced concrete seismic wall, in order to improve toughness and increase the efficiency of bar arrangement work, it is considered to provide an annular reinforcing bar, a spiral hoop bar or an annular bar to surround a plurality of vertical bars ( (For example, see Patent Documents 1, 2, or 3.)
Japanese Patent Laid-Open No. 2002-322751 JP-A 64-75784 JP-A-5-71170

  However, in the method of arranging the out-of-plane reinforcing bars and the annular reinforcing bars, the construction is complicated for the following reasons. That is, there are many bar arrangement places, such as an out-of-plane reinforcing bar and an annular reinforcing bar, in the wall width direction and the wall height direction. Moreover, there are many bending processes in the four corners, such as both ends of the out-of-plane reinforcing bar and the annular reinforcing bar. And since it bend | folds in this way, an out-of-plane reinforcement reinforcement, an annular reinforcement, etc. are hard to arrange. Furthermore, since the covering thickness of concrete is determined by the out-of-plane reinforcing bars or the annular reinforcing bars, it is necessary to manage the covering thickness in all the out-of-plane reinforcing bars and the annular reinforcing bars.

  The subject of this invention is improving the toughness performance in a reinforced concrete earthquake-resistant wall, without requiring complicated reinforcement construction.

  In order to solve the above problems, the invention according to claim 1 is, for example, as shown in FIGS. 1 and 2, a plurality of vertical bars 5 arranged at predetermined intervals in the wall width direction along the front and back surfaces. A reinforced concrete seismic wall 1 comprising a plurality of corrugated horizontal stripes 7 whose planar shape is formed in a wave shape in which concave portions 2 and convex portions 3 are alternately continued in the wall width direction. A pair of corrugated transverse stripes 6 intersecting each other so that the concave portion 2 and the convex portion 3 face each other as a pair are arranged at a predetermined interval in the wall height direction. 3 is arranged so as to surround a plurality of the vertical stripes 5 including two arranged along the front and back surfaces.

  In this way, the horizontal stripes are formed in a wave shape in which the planar shape is alternately continuous in the wall width direction with the concave portions 2 and the convex portions 3 alternately, and the concave portions 2 and the convex portions 3 Are crossing each other so as to face each other. And the concave concrete part 2 and convex part 3 which this corrugated horizontal stripe pair 6 opposes surround the multiple vertical bars 5 including the two arrange | positioned along the front and back, The core concrete of the earthquake-resistant wall 1 is made. to bound. Due to the restraining effect (confined effect) of the corrugated horizontal stripe 7, the deformation performance of the concrete is improved, the deformation in the wall thickness direction (out-of-plane direction) of the earthquake resistant wall 1 is suppressed, and the tough performance is improved.

  Further, when the seismic wall 1 receives a horizontal force, a tensile force T is generated in the corrugated transverse stripe 7 so as to resist it. When the corrugated transverse bar 7 receives the tensile force T, the corrugated transverse bar pair 6 applies a compressive force C to the core concrete from the out-of-plane direction. By this compressive force C, the deformation of the core concrete in the out-of-plane direction is further suppressed.

  In this way, since the deformation in the wall thickness direction of the earthquake-resistant wall 1 is suppressed only by arranging the corrugated horizontal reinforcing bar pair 6, an out-of-plane reinforcing bar, an annular reinforcing bar, or the like that makes the conventional construction complicated is not necessary. Therefore, since the number of places to be bent is smaller than in the prior art, and it is easy to arrange the bars, the workability of the bar arrangement is good, and the construction period and cost can be suppressed. Moreover, since the concrete covering thickness is determined only by the corrugated transverse stripe 7, it can be easily managed by a spacer or the like.

  The invention according to claim 2 is the reinforced concrete earthquake resistant wall 1 according to claim 1, for example, as shown in FIG. The position of the part 3 is shifted and arranged in the wall width direction.

  In this way, in the corrugated horizontal stripe pair 6 adjacent to each other in the vertical direction, by disposing the positions of the opposing concave portion 2 and convex portion 3 in the wall width direction, discontinuity in the wall width direction of the corrugated horizontal stripe 7 is obtained. The toughness of the earthquake resistant wall 1 can be ensured without causing the portion to continue in the wall height direction.

  According to the present invention, by constraining the core concrete with the concave and convex portions facing each other in the corrugated transverse bar pair, the wall thickness direction (out-of-plane direction) of the reinforced concrete earthquake-resistant wall can be obtained without requiring complicated bar arrangement work. Deformation can be constrained and its toughness can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, in this embodiment, the present invention is a reinforced concrete earthquake-resistant wall 1 (hereinafter referred to as an earthquake-resistant wall 1) in which reinforced concrete columns 8 (hereinafter referred to as columns 8) are provided on both sides. )).

  The column 8 includes a plurality of main bars 9 arranged at predetermined intervals along the outer peripheral surface, and a plurality of band bars 10 surrounding the plurality of main bars 9 from the outside.

  The earthquake-resistant wall 1 includes a plurality of vertical bars 5 arranged at predetermined intervals in the wall width direction along the front and rear surfaces. These vertical bars 5 are paired at a predetermined interval in the wall thickness direction (hereinafter referred to as vertical bar pair 4).

  Furthermore, the earthquake resistant wall 1 includes a plurality of corrugated horizontal stripes 7 in which a planar shape viewed from the vertical direction is formed in a wave shape in which the concave portions 2 and the convex portions 3 are alternately continued in the wall width direction. ing. Specifically, the corrugated transverse stripes 7 are alternately located on one side surface side and the other side surface side of the earthquake resistant wall 1 alternately with a plurality of transverse stripe portions 7a located at a predetermined interval in the wall width direction. The end portions of the horizontal stripe portions 7a are connected to each other, and there are a plurality of oblique stripe portions 7b positioned obliquely with respect to the wall width direction. That is, the concave portion 2 and the convex portion 3 of the corrugated horizontal stripe 7 are formed in a trapezoidal shape by a plurality of continuous horizontal stripe portions 7a and oblique stripe portions 7b. In addition, both end portions of each corrugated transverse stripe 7 are fixed to the pillars 8 on both sides by extending the transverse stripe portion 7 a and projecting from the end face of the earthquake-resistant wall 1.

  Two corrugated horizontal stripes 7 are paired and crossed so that the concave portion 2 and the convex portion 3 of each corrugated horizontal stripe 7 face each other when viewed from the vertical direction (hereinafter referred to as corrugated horizontal stripe pair 6). A plurality of the corrugated horizontal stripe pairs 6 are arranged at predetermined intervals in the wall height direction. Specifically, the corrugated transverse stripe pair 6 is configured such that the transverse stripe portions 7a of the respective waveform transverse stripes 7 face each other and the oblique stripe portions 7b intersect in an X shape.

  Here, the corrugated horizontal stripe 7 is formed by bending the corrugated transverse stripe 7 every two pairs of vertical stripes 4 and bending between adjacent pairs of vertical stripes 4, and the vertical stripe 5 is arranged at the bending point. . And the opposing recessed part 2 and the convex part 3, ie, the opposing horizontal stripe part 7a, and the oblique stripe part 7b of the both sides, are arrange | positioned along the front and back two pairs of vertical stripes 4 (four lines) It surrounds the vertical line 5).

  As shown in FIG. 2, the corrugated transverse stripe pair 6 is configured by overlapping the knitted lines 7b so that the crossing of the oblique stripe portions 7b is alternately knitted in the wall width direction.

  Further, the corrugated transverse stripe pairs 6 adjacent in the vertical direction in the vertical direction are arranged such that the positions of the concave portions 2 and the convex portions 3 facing each other are shifted in the wall width direction. Specifically, the horizontal stripes 7a and the oblique stripes 7b of the pair of corrugated horizontal stripes 6 at the vertical position are alternately shifted.

  The corrugated horizontal bars 7 are processed by bending a reinforcing bar into a corrugated shape, and are manufactured in advance in the factory or processed on site. The corrugated horizontal stripes 7 and the vertical stripes 5 are fixed and arranged at predetermined positions, and a mold frame is assembled therearound, and then concrete or the like is placed in the mold frame to form the earthquake resistant wall 1.

  According to the present embodiment, the opposing horizontal stripe portion 7a of the corrugated horizontal stripe pair 6 and the oblique stripe portions 7b on both sides thereof surround the plurality of vertical stripes 5 arranged along the front and back surfaces. The core concrete of the earthquake resistant wall 1 can be restrained. Due to the restraining effect (confined effect) of the corrugated horizontal stripes 7, the deformation performance of the concrete can be improved, the deformation in the wall thickness direction (out-of-plane direction) of the earthquake resistant wall 1 can be suppressed, and the tough performance can be improved.

  Further, when the seismic wall 1 receives a horizontal force, a tensile force T is generated in the corrugated transverse stripe 7 so as to resist it. When the corrugated transverse bar 7 receives the tensile force T, the oblique muscle part 7b tries to return to a straight line, and therefore the corrugated transverse bar pair 6 applies a compressive force C to the core concrete from the out-of-plane direction. By this compressive force C, the deformation of the core concrete in the out-of-plane direction can be further suppressed. The tough performance of the earthquake resistant wall 1 can be improved by the above two actions.

  And in order to suppress the deformation of the seismic wall 1 in the wall thickness direction, it does not require an out-of-plane reinforcing bar or an annular reinforcing bar, which is complicated in the conventional construction, and the corrugated horizontal bar pair is bent into a wave shape. 6 only needs to be arranged, and since the number of places to be bent is smaller than in the conventional case and the arrangement of the bars is easy, the workability of the bar arrangement is good, and the construction period and cost can be suppressed. Further, since the concrete covering thickness is determined only by the horizontal stripe portion 7a of the corrugated horizontal stripe 7, it can be easily managed by a spacer or the like.

  Further, in the corrugated transverse stripe pair 6 adjacent to each other in the vertical direction, the positions of the opposing transverse stripe portions 7a (positions of the intersecting oblique stripe portions 7b) are shifted in the wall width direction, so that The tough performance of the earthquake-resistant wall 1 can be ensured without continuing the unmuscle portion which is a discontinuous portion in the width direction in the wall height direction.

  In the above embodiment, the present invention is applied to a seismic wall having columns on both sides, but the present invention is not limited to this, and may be applied to a seismic wall having a wall structure without a column. Good. Further, the vertical stripes do not necessarily have to be paired at the same position when viewed from the wall thickness direction. Furthermore, the pair of corrugated transverse stripes does not necessarily require the two corrugated transverse stripes to be in contact with each other, and has a gap in the wall height direction with the transverse stripes facing each other and the oblique stripes intersecting when viewed from the vertical direction. May be. And, of course, the specific details such as the number of vertical stripes surrounded by the opposite horizontal stripe portions and the oblique stripe portions of the waveform horizontal stripe pairs, the wave shape of the waveform horizontal stripes, and the like can be appropriately changed. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a horizontal sectional view which shows one Embodiment of the reinforced concrete earthquake-resistant wall of this invention, (a) And (b) shows arrangement | positioning of the corrugated horizontal reinforcement pair adjacent up and down in the perpendicular direction. It is the expanded horizontal sectional view which showed the principal part in embodiment in FIG. It is a horizontal sectional view which shows the conventional reinforced concrete structure earthquake-resistant wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforced concrete seismic wall 2 Concave part 3 Convex part 4 Longitudinal line pair 5 Longitudinal line 6 Corrugated transverse line pair 7 Corrugated transverse line 7a Horizontal line part 7b Oblique line part

Claims (2)

A reinforced concrete earthquake resistant wall comprising a plurality of vertical bars arranged at predetermined intervals in the wall width direction along the front and back surfaces,
The planar shape comprises a plurality of corrugated horizontal streaks formed in a wave shape that alternately continues concave and convex portions in the wall width direction,
A pair of corrugated transverse stripes that intersect with each other so that the concave portion and the convex portion face each other with the corrugated transverse stripe as a pair, are arranged at predetermined intervals in the wall height direction,
The reinforced concrete earthquake resistance, wherein the opposed concave and convex portions of the corrugated horizontal bar pair are arranged so as to surround a plurality of the vertical bars including two arranged along the front and back surfaces. wall.   2. The reinforced concrete structure according to claim 1, wherein the pair of corrugated transverse bars adjacent vertically in the wall height direction are arranged such that the positions of the opposed concave and convex portions are shifted in the wall width direction. Seismic wall.

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