某平面不规则结构抗震性能研究

Study on Seismic Performance of an Irregular Plane Structure

某框架—剪力墙结构位于8度抗震设防区域,其平面投影形状为不对称哑铃型,属于高烈度下的平面不规则结构。采用NosaCAD结构分析软件对该结构进行弹塑性时程分析,研究该结构在8度多遇和罕遇地震作用下的抗震性能。分析结果表明:多遇地震下,结构构件未出现损坏;罕遇地震下,塑性铰首先出现在剪力墙连梁上,部分柱子出现压碎,剪力墙仅出现受拉裂缝。结构最大层间位移角满足规范限值的1/100的要求。构件破坏顺序和分布能够在一定程度上耗散地震能量。计算结果表明,结构可以满足"大震不倒"的抗震设防要求。

With an asymmetrical dumbbell shape in projection,A frame-shear wall structure,which is located in 8 seismic intensity area,is an irregular plane frame-shear wall building structure under the high seismic intensity area.In this paper,in order to study the seismic behavior of the structure in frequent and rare intensity of 8 degree earthquakes,NosaCAD was used to perform elasto-plastic time history analysis.The results indicate that there is no damage elements under frequent earthquakes.Under rare frequency earthquakes,the yielding hinges firstly occur on some coupling beams.Some columns have been crushed and the shear-wall is only damaged with some tensile cracks.The maximum inter-story drift of the structure can meet the requirement of Chinese code.The order and distribution are reasonable,which can dissipate the earthquake energy on some degree.The structure satisfies the code requirements of no collapse under rare earthquakes.