基于性能的钢结构减震设计方法研究

Research on the Method of Damping Design of Steel Structure Based on Performance

【目的】为了满足社会发展需求,越来越多的钢结构建筑出现在人们的生活中,其中地震灾害是任何建筑物都要克服的困难。【方法】本研究通过介绍基于性能的抗震设计理论,并以现有的多层钢结构为模型,运用有限元分析软件Etabs对多层钢结构减震设计进行分析。【结果】通过建立三种减震结构模型,对其进行模拟分析。根据规范要求选取三条地震波,并对其进行多遇、罕遇地震下的动力时程分析,并对比三阶振型,均满足规范要求。【结论】通过对比结构的层间位移、顶点加速度,发现增加屈曲约束支撑后的钢结构的减震效果明显,能有效提升结构的性能。

[Purposes]In order to meet the needs of social development,more and more steel structure buildings appear in people′s life,among which earthquake disaster is a problem that any building must overcome.[Methods]With the introduction of the theory of performance-based seismic design,this study takes the existing multi-storey steel structure as the model and uses the finite element analysis software Etabs to carry on the design and analysis of multi-storey steel structure.[Findings]Three kinds of damping structure models are established and carried on the simulation analysis.By selecting three seismic waves according to the requirements of the code,the dynamic time history analysis is carried out for them under frequent and rare earthquakes and the third-order modes are compared,which all meet the requirements of the code.[Conclusions]By comparing the interlayer displacement and vertex accel⁃eration of the structure,it is found that the damping effect of the steel structure with buckling constraint support is obvious,which can improve the performance of the structure.