(1 湖南大学土木工程学院钢结构研究所， 长沙 410082； 2 湖南城市学院土木工程学院， 益阳 413000)

［摘要］装配式桁架梁组合楼盖是一种新型楼盖结构体系，该楼盖的拼装连接采用高强螺栓连接。为了能采用备用荷载路径法（AP法）分析该新型楼盖基于连接失效的抗连续倒塌性能，对AP法中关键连接的判别、动力分析中连接失效的模拟以及静力分析中荷载动力放大系数的取值等问题进行了研究。结果表明：通过基于整体结构响应的敏感性分析，可以快速地找出新型楼盖中的关键连接；采用全动力等效荷载瞬时卸载法可以较准确地模拟关键连接的失效过程；荷载动力放大系数对于线性静力分析取2-0偏于保守，对于非线性静力分析取1-35是合理的。

［关键词］装配式组合楼盖； 备用荷载路径法； 抗连续倒塌； 敏感性分析； 动力放大系数

中图分类号：TU973-32文献标识码：A文章编号：1002-848X(2019)11-0038-05

Progressive collapse analysis of assembly truss beam composite floor based on connection failure

Shu Xingping1， Zhou Dingliang1， Zhang Zaihua2， Liu Zelong1

（1 Steel Structural Institute of Civil Engineering College， Hunan University， Changsha 410082， China；2 College of Civil Engineering， Hunan City University， Yiyang 413000， China）

Abstract:The assembly truss beam composite floor is a novel floor system, which is connected by high-strength bolts. In order to use the alternate load path method (AP method) to analyze the progressive collapse-resistance performance of the new type floor based on connection failure, the identification of key connections in AP method, the simulation of connection failure in dynamic analysis, the dynamic increase factor in static analysis and other issues were studied. The results show that sensitivity analysis based on the overall structural response can quickly find out the key connections of the new type floor system. Using full dynamic equivalent load transient unloading method can accurately simulate the failure process of key connection. The dynamic increase factor of 2-0 is conservative for the linear static analysis, and 1-35 is reasonable for the nonlinear static analysis.

Keywords:assembly composite floor; alternate load path method; progressive collapse-resistant; sensitivity analysis; dynamic increase factor