高层结构塔楼嵌固端问题研究

Study on the tall building partial fixing

带地下室高层结构的计算中,为简化常取带2~3跨地下室模型,并取其计算结果设计上部塔楼。此时,地下室顶板要满足规范关于嵌固端的要求。本文通过分析论证:当上部塔楼和地下室均建入模型准确计算时,地下室带两跨加四周土弹簧的模型和地下室全部建入模型加四周土弹簧的模型,两者的计算结果在上部无明显区别,均真实地模拟了结构的力学特性。此时,与结构力学行为的嵌固端不同,地下室顶板嵌固端为名义嵌固端,仅用于确定加强区配筋构造及设定抗震等级。

When analyzing the tall building,we always use the model which has two-span or three-span frame basement to calculate the building and use the calculation to design the building. In this case,the condition of partial fixing should accord with the technical specification for concrete structures of tall building( JGJ3—2010). When the model includes the basement,we demonstrate the model which includes the two-span frame basement which has the soil spring is the same in calculation result with the model which includes all basement which has the soil spring. Two modes have simulated the real structure mechanical properties as same. In this case,the partial fixing is the name partial fixing,which only serves for the constructional reinforcement,and it is different from the mechanical partial fixing。