MISC

2017年4月1日

複数の縦長開口を有するRC連層耐震壁の構造性能:-縦開口が1列に偏在配置される場合と斜めに配置される場合の実験-

日本建築学会構造系論文集
  • 廣澤 光法
  • ,
  • 劉 虹
  • ,
  • RAMAROZATOVO Rado
  • ,
  • 鈴木 卓
  • ,
  • 高橋 之
  • ,
  • 真田 靖士
  • ,
  • 市之瀬 敏勝

82
734
開始ページ
579
終了ページ
588
記述言語
英語, 日本語
掲載種別
DOI
10.3130/aijs.82.579
出版者・発行元
日本建築学会

 In Japan, the structural performance of RC shear walls with openings has been directly evaluated by several strength reduction factors implemented in AIJ standards, while the strength reduction due to door openings (AIJ 2010) has not been verified thoroughly, owing to the lack of test date from reliable experimental simulations on fundamental behavior of shear walls with door openings. This paper reports a series of laboratory tests conducted on multi-story shear walls with variable layout of door openings, investigating the performances and behaviors of the specimens.<br> On the other hand, a new loading method was proposed, which was verified through two-dimensional FEM analyses of three-story specimens with different loading conditions. The analyses considered W1-D and W1-C subjected to triangularly distributed loads on the beam of each floor and a couple of concentrated loads at the equivalent height (7/9H) simulating equivalent shear force and bending moment on the bottom of the W1-D, respectively. Consequently, the shear force vs. drift angle relationships and the minimum principle stress contours showed good agreements between two models.<br> Three 1/4 scale shear wall specimens were designed with variable layout of door openings: WN0, WV1 and WD1, respectively without openings, with eccentrically-aligned openings and with diagonally-aligned openings. The specimens were subjected to static cyclic lateral loads induced by two horizontal jacks connected to two separated stubs at the height of 7/9H on both sides of the specimens. PC bars were provided between the stubs to prevent tensile failure at the stub-wall boundaries.<br> WN0 showed compression concrete failure at the base of a column (Fig. 12), and failed in shear. While WV1 and WD1 specimens with openings failed mainly with concrete crushing of the beams around openings, and showed compression failures at their bases as well, occurring differently under the positive and negative loads due to the unsymmetrical layout of the openings (Figs. 20 and 25). As a result, the seismic performance, especially the maximum strength of the specimens decreased due to the existence of door openings: 500kN for WN0, 183kN and -241kN for WV1, 365kN and -299kN for WD1, respectively. Therefore, the lateral strength estimated for WV1 with eccentrically-aligned openings based on the reduction factor r3 overestimated the maximum strength obtained from the test, while WD1 with diagonally-aligned openings based on the reduction factor r2 overestimated the maximum strength under the negative loads and underestimated the maximum strength under the positive loads.<br> As observed during the tests, the failure patterns that high compression was applied to the beams around openings (WD1 and WV1), and to the bottom of the wall with the tensile boundary column (WV1), should be taken into consideration in practical design for multi-story shear wall with door openings. Meanwhile, the experimental results obtained in this study, especially the different seismic performance of specimens under the positive/negative loads due to the unsymmetrical layout of the openings, can be set as a premise for future researches on the same subject and/or a base to improve the design code of AIJ standards.

リンク情報
DOI
https://doi.org/10.3130/aijs.82.579
CiNii Articles
http://ci.nii.ac.jp/naid/130005630293
ID情報
  • DOI : 10.3130/aijs.82.579
  • ISSN : 1881-8153
  • ISSN : 1340-4202
  • CiNii Articles ID : 130005630293
  • identifiers.cinii_nr_id : 9000350637147
  • SCOPUS ID : 85019479416

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