楼板对钢筋混凝土框架结构连续倒塌的影响

为了研究楼板对结构的连续倒塌的影响,本文建立了一个五层框架结构模型,采用SAP2000（V14）对考虑楼板和不考虑楼板两种情况进行抗连续倒塌分析。文章分析了楼板对失效柱顶节点位移、节点加速度以及梁塑性铰的影响。结果表明：楼板对于框架结构抗连续倒塌有较大的贡献,失效柱上节点动力响应随失效柱位置的变化而变化。其中,长边中柱失效、角柱失效属于连续倒塌中较薄弱环节,尤其是角部柱顶层出现柱失效时。总体上,未考虑楼板模型的分析结果较为保守。因此,在今后重要建筑结构抗连续倒塌设计中,应考虑楼板对于结构的贡献,这样可以更加接近真实情况,并有助于提高结构经济性。除此之外,还应加强如长边中柱、角柱部位的构件强度。

The Influence of Floor Slab of Reinforced Concrete Frame Structures during Progressive Collapses

In order to study the influence of floor slab of Reinforced Concrete Frame Structures during progressive collapses,a five-layers frame structure was built and was used to analyze two conditions which consider floor slab or not in resisting progressive collapses.This paper analyzed the influences of floor slab on displacement,acceleration of top joint of failure column,and also the influence of plastic hings states.The analytical results show that floor slab has a great influence on the dynamic response of top joint of failure column,especially when the failure appeared in the long-side and the corner of the frame.In general,it＇s conservative without considering the influence of floor slab.In the end,reinforcing the component strengths of the long-side and the corner in the future is great way to improve the economy.