特大地震下超限高層結(jié)構(gòu)破壞特點(diǎn)分析
焦柯，吳桂廣，賈蘇，歐旻韜，陳星
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（廣東省建筑設(shè)計(jì)研究院， 廣州 510010）
［摘要］針對(duì)7度區(qū)7棟超高層框架-核心筒結(jié)構(gòu)，加載8度罕遇地震作用進(jìn)行計(jì)算分析。結(jié)果表明，結(jié)構(gòu)的整體破壞主要原因是結(jié)構(gòu)豎向剛度突變部位或底部加強(qiáng)部位發(fā)生較大范圍的墻肢剪切破壞。同時(shí)，裙房頂和塔樓頂?shù)牟糠挚蚣苤l(fā)生拉彎破壞，而其他大部分外框架柱抗剪承載力有較大的富裕。結(jié)構(gòu)發(fā)生剪切破壞時(shí)的樓層最大位移角在1/119～1/66之間。有限元分析表明，墻肢在小偏拉作用下抗剪強(qiáng)度顯著下降，在特大地震作用下受拉墻肢的剪切破壞可能先于拉彎破壞。僅按規(guī)范剪壓比限值0.15控制剪力墻的抗剪強(qiáng)度不能保證結(jié)構(gòu)安全。［關(guān)鍵詞］特大地震; 超限高層結(jié)構(gòu); 彈塑性時(shí)程分析; 剪切破壞中圖分類號(hào)：TU318.2 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)23-0021-07
Failure characteristics analysis on out-of-code high-rise structure under extremely rare earthquakeJiao Ke, Wu Guiguang, Jia Su, Ou Mintao, Chen Xing(Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, China)Abstract: Seven super high-rise frame-corewall structures in area of 7 degree seismic intensity were loaded with rare earthquake action of 8 degree seismic intensity, and the structures were calculated and analyzed. The results illustrate that it is the wide-range wall-pier shear failure occurs in the positions with vertical stiffness mutation or in bottom strengthening areas that mainly causes overall failure of the structure. Meanwhile, tensile-bending failure occurs in some of frame columns located on the podium top and tower top. However, most other outer frame columns have enough shear capacities. The maximum interlayer displacement angle is between 1/119 and 1/66 when the structure occurs shear failure. The FEM analysis illustrates that the shear strength of wall-pier descends significantly under small eccentric tension load, and shear failure may occur earlier than tensile-bending failure in the tensile wall-pier under extremely rare earthquake. Controlling the shear strength of shear wall according to limited value of shear-compression ratio as 0.15 in the code cannot assure the structural safety.Keywords:extremely rare earthquake; out-of-code high-rise structure; elasto-plastic time-history analysis; shear failure
作者簡(jiǎn)介：焦柯，教授級(jí)高級(jí)工程師，Email：gscad@qq.com。
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