基于复模态反应谱法的MSCSS控制特性研究

Research on control characteristics of mega-sub controlled structure system(MSCSS) based on complex modal response spectrum method

巨子型结构体系(Mega-sub Controlled Structure System,即MSCSS)作为一种新型超高层建筑结构体系,由于其特殊的构造特性使得结构体系的阻尼矩阵呈现出非经典阻尼的分布特征。为准确高效地研究MSCSS的控制特性,避免强迫解耦和时程分析法所带来的误差与不足,文中基于复模态理论对非经典阻尼系统进行解耦,验证了基于复模态的CCQC法(Complex Complete Quadratic Combination)对MSCSS的适用性,采用CCQC法对MSCSS进行抗震分析。结果显示出MSCSS优于MFS(Mega Frame Structure)的抗震特性,并且MSCSS的控制特性主要体现在含有调频子结构的巨层。

As a new type of high rise building, the mega-sub controlled structure system(MSCSS) shows the characteristics of non-classical damping distribution. In order to grasp accurately and efficiently the control characteristics of MSCSS and avoid the errors of the forced uncoupling method and the deficiency of the time-history method, in this paper, the complex modal theory is used to decouple the non-classical damping system, and then the suitability of the CCQC method(Complex Complete Quadratic Combination) for MSCSS is approved. After that, the seismic analysis of MSCSS is carried out. Finally, the results clearly show that the seismic features of MSCSS are superior to the MFS. Furthermore, the control characteristic of MSCSS is mainly reflected on substructure which adjusts the frequency.