混凝土结构抗连续倒塌研究综述

连续倒塌是整体结构系统的复杂力学行为,涉及极端荷载的不确定性、结构行为的强动力非线性和承载机制的超大变形特征。为了更好地应用已有抗连续倒塌研究成果,分别对国内外影响较大的混凝土结构抗连续倒塌的试验、数值和理论研究结果进行了梳理。结果表明:已有试验研究主要集中于框架结构和板柱结构,对剪力墙结构、框剪结构等其他类型结构研究明显偏少,主要抗力机制的理论计算模型过于复杂,不利于工程应用,已有数值研究不能准确考虑大变形下钢筋黏结滑移失效、钢筋断裂和混凝土软化、破碎,准确性有待提高; 现有研究基本没有考虑多灾害耦合作用的不利影响,导致研究结论不准确,不利于指导设计; 未来需要进一步研究动力倒塌失效规律、不同类型结构的连续倒塌、整体结构系统连续倒塌规律、灾害相关的连续倒塌机理、面向多灾害防御的抗连续倒塌体系、面向工程的抗连续倒塌设计方法、高效连续倒塌数值分析模型等。

Review of Study on Progressive Collapse Resistance of RC Structures

Progressive collapse is a complex mechanical behavior of the whole structural system, involving the uncertainty of extreme load, the strong dynamic nonlinearity of structural behavior and the super large deformation characteristics of bearing mechanism. In order to better apply the existing research results of progressive collapse resistance, the experimental, numerical and theoretical research results of concrete structures with great influence at home and abroad were combed. The results show that the existing experimental research mainly focus on frame structure and plate column structure, and there is obviously less research on other types of structures such as shear wall structure and frame shear structure. The theoretical calculation model of main resistance mechanism is too complex, which is not conducive to engineering application. The existing numerical studies can not accurately consider the bond slip failure of reinforcement, fracture of reinforcement and softening and crushing of concrete under large deformation, and the accuracy need to be improved. The existing research basically does not consider the adverse effects of multi disaster coupling, which leads to inaccurate research conclusions and is not conducive to guiding the design. In the future, it is necessary to further study the failure law of dynamic collapse, the continuous collapse of different types of structures, the progressive collapse law of overall structural system, the progressive collapse mechanism related to disasters, the anti-progressive collapse system for multi disaster defense, the anti-progressive collapse design method for engineering, and the efficient numerical analysis model of progressive collapse.