大底盘L型钢结构的抗震性能分析

Study on Seismic Performance of L-Shaped Irregular Steel Structure with Large Chassis

针对不规则钢结构的抗震性能问题,运用SAP2000有限元软件,建立大底盘L型的不设支撑、增设单斜杆支撑和增设X型支撑的钢结构模型,进行模态分析、反应谱分析和时程分析。结果表明,增加单斜杆支撑或X型支撑之后,结构的自振周期、层间位移及层间位移角均有明显改善,增强了结构的抗震性能。与单斜杆支撑相比,X型支撑对结构抗震性能的改善作用更明显。

In order to study the seismic performance of irregular steel structure,SAP2000 finite element software is used in this paper to establish the L-shaped steel structure model of large chassis. And non-support,single-inclined bar support and X-shaped support are added to the original structure respectively to carry out modal analysis,response spectrum analysis and time history analysis. It can be seen from the analysis results that the natural vibration period,inter-layer displacement and inter-layer displacement angle of the structure are significantly reduced after the addition of single-inclined bar support and X-type support. The addition of supports greatly improves the seismic performance of the structure. Compared with the single-diagonal bracing,X-type bracing has a more obvious effect on seismic performance improvement.