多点地震下大跨展览馆动力弹塑性分析

Dynamic elastic-plasticity analysis of long-span exhibition hall under multi-support seismic excitations

摘要:

为研究大跨空间展览馆在多点地震激励下的弹塑性反应和抗震性能，利用SAP2000软件建立结构的有限元模型，采用TJU.SAP2ABAQUS接口程序转化为相应的ABAQUS模型，经模态分析验证了转化前后模型的一致性.分别考虑单向和三向地震输入，对该结构进行了地震一致和多点激励下的动力弹塑性分析.结果表明：单向多点地震激励下，柱底内力、剪力墙应力以及结构顶部位移均较一致激励时增大；三向多点激励下，结构柱底内力和剪力墙的应力较单向多点激励时有增有减，结构顶部位移增大；多点激励对结构两侧柱底内力的影响显著，对中部柱底内力的影响较小.

Abstract:

To investigate the elastic-plastic responses and seismic resistance performance of the long-span spatial exhibition hall under multi-support excitations, the finite element model was established by SAP2000 software, and this model was converted into ABAQUS model by TJU.SAP2ABAQUS interface program. The consistency was verified by modal analysis. Considering unidirectional and three-directional earthquake inputs, the dynamic elastic-plasticity analysis under uniform and multi-support seismic excitations were investigated, respectively. The results indicate that the column-bottom internal forces, shear wall stresses and top displacements under unidirectional multi-support excitations are larger than those under uniform excitation. In contrast to unidirectional multi-support excitations, the column-bottom internal forces and shear wall stresses are larger or less than those under three-directional multi-support excitations, and the top displacements of the structure are amplified. In both sides of structure the effects on column-bottom internal forces are significant under multi-support excitations, and in the middle of structure the effects are small.