加强层和楼层梁对框-筒结构侧移的影响

Effect of strengthened stories and floor beams on the sideway of frame-tube structure

为弥补设置加强层的高层框架-筒体结构简化的结构力学分析模型存在的不足,基于同时考虑普通楼层梁和加强层作用、由最小势能原理推导出顶部加强框架-筒体结构侧移曲线解析表达式.结合算例,分析了普通楼层梁、加强层对结构侧移的影响程度和规律;定量说明了普通楼层梁对结构侧移的影响是不容忽略的;探讨了设置加强层减小高层框架-筒体结构侧移的同时,尽量降低由此所带来的抗震不利因素影响的结构设计方法,并对加强层与内芯筒、普通楼层梁与内芯筒的相对线刚度取值提出建议,可供同类结构设计时参考.

implified structural mechanics model can analyze frame-tube the structure with strengthened stories partly. The analytic expression for the sideway curve of top-strengthened frame-tube structures, considering the influence of floor beams and strengthened stories on the sideway of the structure, was derived by using the minimum potential energy principle. It was analyzed that how floor beams and strengthened stories effect the sideway of the structure from some practical examples. The quantitative results show that the influence of floor beams on the sidesway can not be ignored in the designs. Some structural design methods were investigated to reduce unfavorable factors caused by the strengthened stories whose designs consider the precautions against earthquake. Recommended relative stiffness values of the strengthened story to core wall and the floor beam to core wall are given, giving reference to designers in their preliminary structure design.