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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。
A frame-shear wall structure is located in the 8-degree seismic fortification area, and its plane projection shape is an asymmetrical dumbbell type, which belongs to the plane irregular structure under high intensity. NosaCAD structural analysis software was used to analyze the elasto-plastic time-history of the structure, and the seismic performance of the structure under 8-degree and rarely-occurred earthquakes was studied. The results show that under the earthquake, no damage occurs to the structural members. In rare earthquakes, the plastic hinges first appear on the shear-wall beams, some of the columns are crushed, and only the tensile cracks occur on the shear wall. The maximum layer displacement angle of the structure meets the requirement of 1/100 of the specification limit. The failure sequence and distribution of components can dissipate the seismic energy to some extent. The calculation results show that the structure can meet the seismic fortification requirements of “big earthquake does not fall”.