某平面不规则结构弹塑性时程分析

Elasto-Plastic Time History Analysis of a Structure with Irregularity in Plan

某框架—剪力墙结构位于8度抗震设防区域,其平面投影形状为折带形,属于高烈度下的平面不规则结构。采用NosaCAD有限元程序建立整体结构分析模型,通过8度多遇和8度罕遇地震作用下的弹塑性时程分析,计算结构的变形和破坏,研究结构在大震作用下的塑性发展机理。计算结果表明,多遇地震下,结构构件未出现损坏;罕遇地震下,塑性铰首先出现在框架梁、柱上,极少数剪力墙底部出现压碎。结构最大层间位移角1/103满足规范的限值要求。构件破坏顺序及分布有利于耗散地震能量。结构可以满足"小震不坏、大震不倒"的设防要求。

With a fold line shape in projection, one frame-shear wall structure, is an located in 8 seismic intensity area, is an irregular structure in plan under the high seismic intensity. In this paper, a scale model is constructed with NosaCAD so as to investigate the deformation, damage, and plastic development of the structure under frequency and rare intensity of 8 degree earthquake by using elasto-plastic time history analysis method. The result indicates that there is no damaged elements under the frequent earthquakes. Under the rare earthquakes, yielding hinges firstly occur on some fame beams or columns and limited concrete has crushed at the bottom of wall elements. The maximum inter story drift of the structure, meet the seismic design requirement of Chinese code when it reaches 1/103. The order and distribution of damages on components are helpful to dissipate dynamic energy. The structure satisfies the code requirements of no damage under frequent earthquake and donor collapse under rare earthquake.