部分柱顶滑移钢筋混凝土框剪结构的地震扭转反应分析

Analysis of torsional response of RC frame-shear wall structures with partial columns sliding at upper ends under earthquakes

通过大量算例分析,揭示了部分柱顶滑移框剪结构因偶然偏心引发的地震扭转效应,以及结构周期比和长宽比对该效应的影响规律,并与常规框剪结构进行了对比,提出了相应的设计建议。研究表明:(1)考虑偶然偏心时,部分柱顶滑移框剪结构的弹性扭转反应略小于常规框剪结构,且结构周期比和长宽比对前者的影响规律与后者几乎相同;(2)随着结构周期比的增加,大震作用下部分柱顶滑移框剪结构的顶层最大水平位移增大幅度总体呈现出上升的趋势,但多数情况下小于常规框剪结构,且上升幅度相比小震时减小;(3)随着结构长宽比的增加,大震作用下部分柱顶滑移框剪结构的顶层最大水平位移增大幅度总体呈现出而先增后降的趋势,且当长宽比在1~2之间变化时上升明显。

Based on extensive numerical analyses,torsional response of the frame-shear wall structures with partial columns sliding at upper ends(FSPCS),due to accidental eccentricity and induced by earthquakes,have been investigated.Influences of the structural period ratio and length-to-width ratio on such response have been revealed.A comparison between the torsional response of the FSPCS and that of the conventional frame-shear wall structure(CFSWS)was presented.It can be found that:①when the accidental eccentricity is taken into account,the elastic torsional response of the FSPCS is less than that of the CFSWS,and the influences of the structural period ratio and length-to-width ratio on the FSPCS are almost the same as those on the CFSWS;②with the increasing of the structural period ratio,the enhancing range of the top storey’s maximum horizontal displacement of the FSPCS under major earthquake generally increases,but in most cases is less than that of the CFSWS.Meanwhile the enhancing range related to the FSPCS under major earthquake is lower than that under minor earthquake;③with the increasing of the length-to-width ratio,the enhancing range of the top storey’s maximum horizontal displacement of the FSPCS under major earthquake generally exhibits a trend of increasing first and then decreasing later,and the enhancing is significant when the length-to-width ratio ranges from 1 to 2.