【摘要】 不等高接地框架结构具有先天竖向不规则性和上接地层柱底部约束存在差异的特点,其扭转效应更显著。通过理论和算例,分析了层间位移比、位移比、周期比三个扭转控制指标在不等高接地框架结构中的适用性。位移比适用于不等高接地框架结构的扭转效应判别,但可能出现位移比不起控制的情况,应与周期比限制相结合;由于耦联周期比随着相对偏心距的增大而减小,可能使不等高接地框架结构扭转效应判别失真,宜按非耦联周期比进行控制;上接地层的层间位移比的计算值可能失真,将导致对不等高接地框架结构扭转的误判。更多还原

【Abstract】 Frame structure with uneven height grounding column ends has vertical irregularity,the constraints at the bottom of the columns in upper ground plane exist differences,so the torsional response should be more significant. Based on theory method and examples analyses,feasibility of storey drift displacement ratio,displacement ratio and period ratio for judged the torsional effect of frame structure with uneven height grounding column ends are analyzed. Displacement ratio can be used to judge torsional effect in frame structure with uneven height grounding column ends,but in some case displacement ratio should be used with period ratio. Because coupled period ratio decreases with increase of eccentricity of the structure,in some case it’s easy to have a mistake in evaluated the torsional response of frame structure with uneven height grounding column ends,uncoupled period ratio is better than coupled period ratio. The value of storey drift displacement ratio of upper ground plane may be distorted,which may result in misjudgment of torsional response in frame structure with uneven height grounding column ends.更多还原