特大地震下超限高层结构破坏特点分析
- 摘 要
-
（广东省建筑设计研究院， 广州 510010）
［摘要］针对7度区7栋超高层框架-核心筒结构，加载8度罕遇地震作用进行计算分析。结果表明，结构的整体破坏主要原因是结构竖向刚度突变部位或底部加强部位发生较大范围的墙肢剪切破坏。同时，裙房顶和塔楼顶的部分框架柱发生拉弯破坏，而其他大部分外框架柱抗剪承载力有较大的富裕。结构发生剪切破坏时的楼层最大位移角在1/119～1/66之间。有限元分析表明，墙肢在小偏拉作用下抗剪强度显著下降，在特大地震作用下受拉墙肢的剪切破坏可能先于拉弯破坏。仅按规范剪压比限值0.15控制剪力墙的抗剪强度不能保证结构安全。［关键词］特大地震; 超限高层结构; 弹塑性时程分析; 剪切破坏中图分类号：TU318.2 文献标识码：A 文章编号：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
作者简介：焦柯，教授级高级工程师，Email：gscad@qq.com。
