大跨度主-副桁架钢结构的地震反应探讨分析
Discussion and Analysis of Seismic Response of Large-span Main and Auxiliary Steel-truss Structures

桁架钢结构被广泛应用于大跨度建筑中，分析桁架钢结构的地震反应具有一定的现实意义。构建大跨度主-副桁架钢结构的有限元模型，以该模型作为研究对象，对其进行地震反应的探讨分析。采用自振特性分析方法在刚度和质量两个因素的基础上分析大跨度主-副桁架钢结构的自振特性；通过振型分解反应谱法分析大跨度主-副桁架钢结构的力学性能，利用桁架钢结构的力学性能分析其地震作用下的反应。模拟发现，大跨度主-副桁架钢结构刚度较好，其抗风柱柱脚连接处的受力最强且位移最大，为大跨度主-副桁架钢结构的地震反应研究提供参考，为其抗震设计提供初步依据。
The steel-truss structure is widely used in long-span buildings, so it is of practical significance to analyze its seismic response. In this paper, we describe our construction of finite element models of a long-span main and auxiliary steel-truss structures and discuss their seismic responses. Based on the two elements of stiffness and mass, we perform a natural vibration analysis of the natural vibration characteristics of the large-span main and auxiliary steel-truss structures. We then analyze the structural mechanical properties of the structures using the modal decomposition response spectrum method, and analyze the seismic response of the steel-truss structures with respect to their mechanical properties. The simulated results show that the structural stiffness of the steel structures is good. These study results provide a preliminary basis for the seismic design of large-span main and auxiliary steel-truss structures