钢桁架结构体系的防连续倒塌性能分析

Analysis for Capability of Preventing Structural Progressive Collapse to Steel Truss Structural System

以实际项目为例,对某钢桁架结构体系采用拆除构件法和局部加强法进行了防连续倒塌性能分析(软件采用Midas GEN),结果表明此钢桁架结构体系的防连续倒塌性能较好,但对于钢桁架结构体系中的关键构件仍需在施工图阶段通过加大构件截面,使其应力比不大于1.0,总体来说此钢桁架结构体系的防连续倒塌设计能够满足规范要求。

This paper takes the actual project as an example,analysis for capability of preventing structural progressive collapse to steel truss structural system has been made by demolition of bar method and local strengthening method(software Midas GEN has been used),the result shows that capability of preventing structural progressive collapse is acceptable. But some key components of steel truss must be enlarge their sections to ensure that corresponding stress ratio is less than 1.0. In general,preventing structural progressive collapse to this steel truss structural system is viable according to Code.