钢筋混凝土框架结构抗地震倒塌破坏的研究现状与对策分析

Present Research Status and Countermeasure Analysis of Earthquake Collapse Damage of RC Frame Structures

总结了罕遇地震作用下结构倒塌破坏的研究现状,重点分析了建筑物倒塌破坏的系统性和不确定性,对比了不同的倒塌破坏准则和倒塌破坏分析方法,给出了建筑物倒塌的临界状态定义。研究结果表明:现有的倒塌破坏准则无法准确定义结构的倒塌破坏;时程分析法更为精确,且较少地引入了地震动随机性影响,更适于结构倒塌研究;建议的倒塌破坏区间能够更好地反映倒塌破坏特性;塑性变形集中是框架倒塌的主要原因,应重视柱端塑性铰发育导致的结构整体性能退化;相关研究成果可为定量研究建筑结构的倒塌破坏提供理论基础。

The present research status of structural collapse damage under rare earthquake was summarized, and the systematicness and uncertainty of structural collapse damage were emphatically analyzed. Meanwhile, the contrastive researches on the different failure criteria and analysis methods were made, and the precise definition of the critical state on structural collapse damage was given. The research results show that the existing failure criteria cannot be used to define the collapse of reinforced concrete （RC） structure precisely. Time history analysis method is more accurate and suitable for collapse research owing to the introduction of a small amount of ground motion randomness. The recommended interval of collapse damage can better reflect the characteristics of collapse damage. The concentration of plastic deformation is the principal factor affecting the structural frame collapse, the overall structure performance degradation caused by the development of plastic hinge in the column ends should be noted. The relevant research results can provide a theoretical basis for quantitative research on the collapse damage of building structure.