基于固有模态的单层球面网壳减震控制

Seismic Vibration Control Analysis of Single Layer Spherical Reticulated Shell Based on the Natural Modes

摘要:

简要介绍并总结了目前大跨度空间结构多重调频质量阻尼器（MTMD）减震控制的发展过程及研究现状.建立了网壳结构MTMD减震控制系统动力学基本方程并进行解耦分析，进而提出了基于控制特定的固有模态的单层球面网壳结构分布多重调频质量阻尼器(DMTMD)减震设计方法与步骤.建立了一个单层球面网壳数值模型，分别考虑水平、竖向地震输入两类工况，对不同震动控制方案的网壳采用El Centro波进行时程分析，并对计算结果进行分析对比.计算结果表明，该减震控制方法可以有效减小结构地震响应.同时，根据数值计算结果，总结提出了一些关于减震控制效果优化的建议.

Abstract:

The developments and research status of seismic vibration control of longspan spatial structures using multiple tuned mass damper (MTMD) are introduced in this paper. The dynamic equation of reticulated shell with MTMD vibration control system is derived and solved. Based on controlling selected natural modes, the design procedure of distributed multiple tuned mass damper (DMTMD) seismic control method of the single layer spherical reticulated shell is proposed. A numerical model of single layer reticulated shell is built. By the method of timehistory analysis with “El Centro seismic waves”, the dynamic responses of the reticulated shell structure equipped with different seismic vibration control schemes are computed, analysed and compared under horizontal and vertical seismic excitations. The numerical results show that the proposed seismic vibration control method is efficient in reducing dynamic response of reticulated shell structures. Beyond that, some suggestions for seismic vibration control optimization design are summarized.