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地震作用下,钢筋混凝土结构的损伤程度可由刚度退化参数量化。基于纤维模型建立了3层钢筋混凝土框架结构有限元模型,分别进行了3种水平侧向加载模式的静力弹塑性分析和弹塑性动力时程分析。依据结构耗能分析,对比了作者提出的刚度退化性能指标D_(performance)与Kunnath和Jenne指标D_(KJ)评价结果的差异,并采用D_(performance)性能指标对结构楼层在不同地震水准下的破坏程度进行了定量评价。研究表明,D_(performance)性能指标对结构水平侧向加载模式不敏感,并能判别结构各楼层的损伤情况,从而确定结构薄弱层的位置,能合理、可靠地评估结构在地震作用下的性能水平。
Under the action of earthquake, the degree of damage to the reinforced concrete structure can be quantified by the stiffness degradation parameter. Based on the fiber model, a three-layer finite element model of reinforced concrete frame structure was established. Static elastic-plastic analysis and elasto-plastic dynamic time history analysis of three horizontal lateral loading modes were respectively carried out. According to the structural energy analysis, the difference between the D-performance index of the stiffness degradation and the K_ (KJ) evaluation index of the Kunnath and Jenne indexes is contrasted. Based on the D performance index, the performance of the structural floor under different seismic levels The extent of damage was quantitatively evaluated. The research shows that the performance index of D performance is insensitive to lateral loading mode of structure level and can determine the damage status of each floor of the structure so as to determine the position of the weak layer of structure and evaluate the performance of the structure under earthquake action reasonably and reliably Level.