角部重叠框架结构的抗震分析及超限界定

通过某模型工程对抗震不利的平面之一--角部重叠框架结构高层建筑进行了分析.结果显示角部重叠面积越小,结构抗扭刚度越小,结构扭转效应会越来越大;地震作用下重叠处楼盖的应力集中越严重,楼板平面内容易产生的较大的变形和裂缝.但认为角部重叠平面做为组合平面的一种,宜在所列三项及三项以上不规则的高层建筑工程做为其中一项进行超限控制,单独做为一项进行超限控制有可能偏严.

Analysis and Extra-limit Determining of Corner-overlap Frame Structure

The analysis on the corner-overlap plane for frame structure tall building ,which is one of design not good for earthquake resistant, is maken. The result shows that the smaller the proportion of corner-overlap is, the less torsional rigidity of structure is, and the more torsional influence is. More stress concentrated on the corner-overlap floor in earthquake will cause serious deformation and fissures easily. In extra-limit determining, the corner-overlap plane should be considered as one of three or more extra-limit controling factors for unregular high building, but not be considered alone.