大型超高钢结构电视塔抗震性能分析

以388 m高河南省广播电视塔为例,研究了大型超高钢结构电视塔抗震性能的分析与评价方法.为评判河南电视塔可能出现的薄弱部位等抗震性能,利用时程分析法对该结构分别进行了多遇地震弹性时程响应分析与罕遇地震弹塑性时程响应分析.同时,为了解河南电视塔刚接模型与铰接模型抗震性能的区别,对该结构两种不同计算模型在弹性阶段的动力行为与弹塑性阶段的非线性动力特性进行了对比分析.研究结果表明:该结构两种分析假定的计算模型均满足小震不坏、中震可修、大震不倒的抗震设防要求,刚接模型整体抗震性能略优于铰接模型.

Earthquake Resistant Behavior of Super High-Rising Steel Tower

Based on a case study of the 388-meter-high Henan TV tower under construction,both conventional earthquake time-history response analysis and rare earthquake nonlinear time-history analysis of the structure are made to assess the seismic behaviour of this TV tower such as weak spot and weak degree.At the same time,a comparative study is conducted on the elastic stage dynamic behaviour and the nonlinear dynamic behaviour during elastic-plastic phrase on the basis of two different structural models to undertand different seismic behaviour of rigidly jointed model and hinged model.The results show that both the structural models can meet the requirements of no-damage under light earthquake,repairable under medium earthquake,and no-collapse under strong earthquake,and the whole earthquake resistant behaviour of rigidly jointed model is a little better than that of hinged model.