建筑物偏心结构对其抗震性能的影响

Effect of Eccentric Structures on the Seismic Performance of Buildings

偏心对建筑物的抗震效果有很大的影响。在对三种常见建筑物框架结构在偏心扭矩作用下的受震反应进行数值模拟时,采用6层建筑物模型,通过三维非线性模拟偏心结构对建筑物抗震性能影响的分析,采用最大层间位移作为衡量标准,绘制易损曲线来进行结果分析。结果显示:若忽略意外扭矩的影响,可能会高估钢结构体系的抗震性能,而影响安全评估结果;如果采用全层5%质量偏心来考虑意外偏心扭矩的话,会低估钢结构建筑物的抗震性能。

Eccentricity has a considerable influence on the seismic effect of buildings.In this study,the seismic responses of three common frame structures under the action of eccentric torque were numerically simulated.The influence of eccentric structures on the seismic performance of buildings was analyzed through three-dimensional nonlinear simulation of a six-story building model.Maximum inter-story displacement was used as the measurement standard,and fragility curves were drawn to analyze the results.The results show that if the influence of accidental eccentric torque is ignored,then the seismic performance of the steel-structure system will be overestimated,thus affecting the safety assessment results.Conversely,if the influence of accidental eccentric torque is considered using 5%mass eccentricity of the entire floor,then the seismic performance of the steel-structure system will be underestimated.