基于组合楼板影响的空间钢框架连续倒塌分析

Progressive Collapse Analysis of Space Steel Frames Considering the Influence of Composite Floor Slab

建筑结构在意外事件情况下的连续倒塌问题,已成为国内外土木工程学科的研究热点。钢与混凝土组合楼板作为目前钢结构常用的楼板形式,对结构的抗连续倒塌能力影响较大。采用拆除构件法对不带楼板、带钢筋混凝土楼板和带组合楼板的9层空间钢框架进行了连续倒塌仿真计算,分析比较了不同框架的自振周期、破坏模式、相邻构件内力变化与失效机制等,研究了组合楼板对结构抗连续倒塌能力的影响。研究表明,考虑组合楼板后空间钢框架结构的抗连续倒塌能力得到显著提高,且提高程度大于钢筋混凝土楼板。

The problem of progressive collapse of building structures in accidental situation has become a research focus in the civil engineering field at home and abroad. Steel-concrete composite floor slabs are commonly used in steel structure frames. The composite slabs served as the main structural components play a major role in resisting the continuous collapse. The progressive collapse simulation calculation was conducted using alternate path method on the nine-space frames without floor slab, with reinforced concrete floor slabs and composite floor slabs. The natu- ral cycle of the different frameworks, failure mode,adjacent components internal force and mechanism of failure were made contrastive study. The result shows that composite floor slabs can significantly improve the progressive col- lapse resistance of the steel frame structures and the degree of improvements is greater than that in the reinforced concrete floor slabs.