长沙某超高层结构整体稳定性设计研究

《高层建筑混凝土结构技术规程》(JGJ 3—2010)对整体稳定性计算做出了水平荷载按照倒三角形分布、考虑结构顶点位移相等而将结构折算为竖向悬臂受弯构件等假定,但这些假定和简化降低了计算精度。通过实际工程案例,对影响刚重比的各种因素进行了分析,研究了地下室层数、地下室侧向土的水平抗力系数、地下室嵌固端楼层刚度比、不同嵌固部位以及屋顶构架等影响因素,分析不同计算程序假定的合理性,确保结构整体稳定性安全可靠。

Study on overall stability design of a super high-rise structure in Changsha

In the Technical specification for concrete structures of tall buildings(JGJ 3-2010),the assumptions of calculation of overall stability include inverted triangle distribution of horizontal load,converting the structure into vertical cantilever flexural member considering equivalent displacement of structure vertex.However,these assumptions and simplifications reduce the accuracy of calculation.Through practical engineering cases,various factors affecting rigidity-weight ratio were analyzed,such as the number of basement stories,horizontal resistance coefficient of basement lateral soil,stiffness ratio of embedded end floor of basement,different embedded parts and roof framework,etc.The rationality of different calculation program assumptions was analyzed to ensure the safety and reliability of the overall stability of the structure.