底部宽肢异形柱框架结构弹塑性分析

Elastic-plastic analysis of hetero-column frame with bottom wide flange columns

对底部宽肢异形柱框架结构与纯异形柱框架结构进行弹塑性时程分析,并对比两种结构的分析结果。探讨2层采用带暗柱的异形柱对底部宽肢异形柱框架结构抗震性能的影响。分析结果表明,底部宽肢异形柱框架结构抗震性能优于纯异形柱框架结构,能有效地克服纯异形柱框架结构底层薄弱现象。2层设置暗柱后,使得各层刚度分布更加合理,且可以有效地避免底部宽肢异形柱框架结构薄弱层上移的不利现象。

Seismic responses of the hetero-column frame with bottom wide flange columns are analyzed by elastic-plastic time history method and are compared with the pure hetero-column frame. Effects of the second layer using the embedded columns of hetero-column frame with bottom wide flange columns on the seismic responses are discussed. It is proved that compared with the pure hetero-column frame, seismic behavior of the bottom wide flange frame is better, and bottom weak phenomenon of the former frame can be effectively overcome. When embedded column is arranged for the second layer, layers stiffness distribution is more reasonable, and the adverse phenomenon that weak story moves up of the bottom wide flange frame can be effectively avoided.