【摘要】 为了更好地研究钢筋混凝土框架结构在地震作用下的损伤演化规律,采用理论分析的方法,改进了以往的基于变形及耗能的双参数损伤指数模型,应用按结构的重要程度所提出的"三水准"抗震设计地震损伤指标作为倒塌评定准则;采用非线性动力有限元法,模拟分析了某三层钢筋混凝土框架结构在地震作用下的倒塌破坏过程,计算了主要构件和整体结构的地震损伤指数,定量的描述了结构的整个倒塌破坏过程。结果表明:改进后的损伤指数计算模型既能够计算最大损伤指数,又能定量连续化计算结构损伤指数,描述结构的整个倒塌破坏过程。采用的单榀双跨结构为研究对象,不仅考虑了边柱而且考虑了中柱损伤,与实际结构破坏过程相符。更多还原

【Abstract】 In order to better study the damage evolution mechanism of reinforced concrete frame structure in earthquake,the two-parameter seismic damage factor model,which is based on deformation and dissipation,was improved using the theoretical analysis method in this study.Using the three-level earthquake-resistant design damage index based on the importance of structure as the collapse criteria for evaluation,the numerical simulation on the collapse of reinforced concrete of a three-tier frame structure was conducted with nonlinear dynamic finite element method.In addition,the dynamic response and damage index of each time step was calculated.The entire collapse process was quantitatively modeled.The result shows that the improved damage index calculation model can calculate both the maximum damage index and the structure damage index quantitatively and continuously,and describe the process of collapse damage of entire structure.Using a single item upper cross-structure as example enables to consider not only side column damage,but also stele damage,which is in confirm with the actual damage process.更多还原