带大跨度空心楼板的高层框架结构抗连续倒塌性能分析

Analysis on the Progressive Collapse Resistance of the High-rise Frame Structure with Long-span Hollow Floors

现浇空心楼板由于其自重轻、成本低、能够满足现代建筑对于建筑功能和使用空间的要求等优势,在大跨度楼盖中的应用越来越广泛。本文基于某带大跨度空心楼盖的高层框架结构,采用基于拆除构件法的Pushdown分析方法从结构极限承载力、失效点竖向位移以及关键构件受力机制等多个方面研究大跨度空心楼板对该结构抗连续倒塌性能的影响。结果表明,大跨度空心楼板可显著提高结构的抗连续倒塌性能,减轻结构倒塌破坏的程度。本文最后结合分析结果提出带大跨度空心楼板框架结构的抗连续倒塌设计建议,对类似工程的设计和研究具有一定的参考性。

Cast-in-situ hollow floors are more and more widely adopted in long-span floors due to the advantages including light weight,low cost,and the ability to meet the requirements of modern buildings for building functions and space.In this paper,based on a high-rise frame structure with large-span hollow floors,the Pushdown analysis method based on the alternative path method was used to study the influence of the long-span hollow floor on the resistance to progressive collapse from the aspects of the ultimate bearing capacity,the vertical displacement of failure points and the force mechanism of key components.The results show that long-span hollow floors significantly improve the resistance to progressive collapse and reduce the structural collapse.Finally,design suggestions for anti-collapse design of frame structures with large-span hollow floors are proposed based on the analysis results,which has certain reference value for the design and research of similar projects.