“马蹄莲”形高层组合结构的动力特性及地震响应分析

Dynamic Characteristics and Seismic Response Analysis of Calla-shaped High-rise Composite Structure

为分析"马蹄莲"形高层组合结构的动力特性及地震响应,以武汉未来科技城为例,建立了"马蹄莲"形主塔楼高层组合结构的三维有限元模型,分析了结构的动力特性,得到结构的固有频率及自振周期,给出结构前四阶振型,并采用时程分析法研究了塔楼整体的三维地震响应及组合结构的薄弱部位。结果表明,塔架结构为组合结构整体的薄弱部位;x方向为组合结构体系抗震弱方向;人工波作用于结构抗震弱方向的楼层间最大侧移与层高之比(Δu/H)小于规范限值,为复杂组合结构的设计和施工提供了可靠保证。

Three-dimensional finite element model of the calla-shaped high-rise composite structure of Wuhan Future City was established and the dynamic characteristics were analyzed.The natural frequencies and vibration period were obtained.Then the first four-order vibration modes of the structure were given.Three-dimensional seismic response and the weak part of the whole composite structure of the whole main building were studied by using time history analysis method.Conclusions drawn from calculation results were as follows：the high-rise tower is the weak part of the whole composite structure;xdirection of the composite structure system is its the seismic weak direction;the specific value of the maximum lateral displacement between layers and stories height are all less than the standard limit value.Therefore,it provides reliable guarantee for the design and construction of the composite structure.