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为了准确评估结构地震损伤,首先对能力谱法进行改进,考虑高阶模态及动力特性改变对结构地震反应的影响,采用基于能量准则的能力谱和弹塑性需求谱计算结构最大顶点位移。其次,推导多自由度体系(MDOF)与等效单自由度(ESDOF)体系的滞回耗能转化关系,利用多模态ESDOF体系的概念评估结构滞回耗能需求。在此基础上,同时引入结构地震变形与滞回耗能,改进模态往复pushover分析方法(MMCP),采用隐式双参数模型评估结构地震损伤。将该方法应用于两个三层钢筋混凝土框架,结果表明:MMCP分析在一定程度上模拟了地震作用,在精确的结构地震位移和滞洄耗能评估基础上,能够准确地预测结构整体和层间损伤。MMCP法还可以与设计反应谱相联系,使评估结果具有一定的普遍性和安全度。
In order to evaluate the seismic damage of structure accurately, firstly, the power spectrum method is improved. The influence of high-order mode and dynamic characteristics on the seismic response of the structure is considered. The maximum vertex displacement of the structure is calculated by the energy spectrum based on the energy criterion and elastoplastic demand spectrum. Secondly, the hysteretic energy conversion relationship between multi-degree of freedom (MDOF) and equivalent single-degree-of-freedom (ESDOF) system is deduced. The concept of multi-mode ESDOF system is used to evaluate the energy demand of hysteretic structure. On this basis, both structural deformation and hysteretic energy dissipation, modal push-pushover analysis (MMCP) method, and implicit two-parameter model are used to evaluate structural seismic damage. The method is applied to two three-story RC frames. The results show that the MMCP analysis simulates the seismic effect to a certain extent. Based on the accurate seismic displacement and stagnant energy estimation, the structure and the layer can be accurately predicted Between the injury. The MMCP method can also be linked to the design response spectrum to make the assessment of a certain degree of universality and safety.