局域大空间复杂体型高层结构整体模型振动台试验研究

本文采用模拟地震振动台试验方法对局域大空间复杂体型高层结构的动力特性、地震反应规律和开裂破坏模式等进行了系统研究,重点分析了地震作用下结构的扭转振动反应及其空间分布规律。研究结果表明:局域大空间对结构的动力学特性具有显著的影响,扭转振型可能成为结构一阶振型;在地震作用下,结构动力反应较大,且具有明显的局域及整体扭转振动,结构局域大空间部位的局部扭转反应可能大于结构顶部的总体扭转反应,易造成大空间部位主要抗侧构件发生扭转破坏。对于此类复杂体型结构,必须采取有效措施增加结构局域大空间部位的抗侧抗扭刚度,以确保结构满足抗震设防要求。

Shake table experimental study of complex high-rise building with large local space

In this paper,a 1/20 scale model of a complex high-rise building structure with large local space was designed and constructed,and a series of white noise tests and earthquake simulation tests were carried out on the shake table to study the dynamic characteristics,the earthquake resistance behaviors and the cracking pattern of the structure.The test results indicate that the dynamic characteristics of high-rise building with large local space are quite complex and the torsional mode could become the basic vibration mode of the structure.It's also found that the torsional dynamic responses at the large local space of the complex model structure are quite large and numerous cracks are occurred in the structural elements that are connected to the large local space.At the end of this paper,some suggestions are given for the seismic design of the complex high-rise building with large local space.