基于共同作用下巨型框架结构的动力特性分析

Study on Dynamic Characteristics of Mega-frame Structure Based on Cooperative Effect Theory

巨型框架结构由于其平面布置的灵活性和以空间整体受力为特征得到了建筑工程广泛的应用,而基于共同作用机理的巨型框架结构对于不同地基类型的动力响应研究并不深入。本论文对巨型框架结构力学机理进行分析,归纳其简化的力学计算模型,应用有限元对砂卵石土-筏基-巨型框架结构体系在地震作用下共同响应进行数值计算,并对巨型框架结构进行模态、谐响应以及地震反应谱分析,研究得出巨型框架结构考虑了共同作用后在频率较高时表现出一定的柔性,同时,巨型框架的层间剪力有所增加,最后,归纳了巨型框架结构在动荷载下的力学机理与响应,确定其动力特性。本文所得结论对工程实践具一定的指导意义。

The mega-frame structure has got more and more recognition because of its flexible layout and whole bearing capacity, but its dynamic response for different foundation based on cooperative effect theory is not fully studied. This paper analyzed the mechanical mechanism of mega-frame structure, and concluded simplified computation model. The finite element analysis soft was adopted to actually compute the corresponded response about cobble stone soil -raft foundation-mega frame structure under earthquake. All mechanical response of mega-frame structure was been analyzed, including mode analysis, harmonic excitation analysis, and reaction spectrum analysis. The results indicate that the mega-frame structure is more flexible under cooperative effect and its storey shear increase obviously. The conclusion of this present paper is employed as a reference for engineering design and analysis.