多遇地震作用下高层钢结构支撑形式设计分析

Analysis of Bracing System for High-rise Steel Structures under Frequent Seismic Action

支撑体系是钢框架结构的重要组成部分,尤其在高层结构中,支撑对提高侧向刚度作用显著。针对高层钢结构中普遍采用的几类支撑形式,分别对其进行多遇地震作用下的承载力极限状态和正常使用极限状态分析。采用的主要分析方法是有限元模型在天津波作用下的时程响应数值模拟,并对杆件应力、层间位移等重要控制变量进行对比分析。研究表明采用合适的支撑形式可有效地提高高层结构侧向刚度。在相同用钢量前提下,十字支撑和人字支撑的作用最为显著。

Bracing system plays an important role in steel frame structures, which could contributes to dramatically increase lateral stiffness of high-rise structures. In this paper, frequent seismic analysis for a high-rise steel flame structure with different bracing systems is carded out. A finite element model of a high-rise steel structure is built and time-history response of the model impacted by Tianjin seismic wave is analyzed. According to the comparison with respect of member stress and story-drift, it is obvious that the implementation of bracing system can improve lateral robustness efficiently. Numerical results reflect it is comparatively efficient and economic to design crossing bracing system and V-shaped bracing system in high-rise steel frame structures.