基于MPA方法的结构滞回耗能计算

在能量反应分析中，滞回耗能是最具明确工程意义的而又便于工程应用的能量指标，可用以衡量结构的塑性累积损伤。然而，以往研究中，在计算多自由度体系的滞回耗能时，通常采用时程分析法，计算比较烦杂，不利于工程实际的应用。因此，本文提出了一种采用模态pushover分析（MPA）计算多层结构滞回耗能的简便方法，并通过两个高层结构算例，验证了该方法的精度。结果表明：基于模态pushover分析的结构滞回耗能计算方法精度良好，结果可靠；对于框架结构，可以直接采用第一阶模态（倒三角）加载模式对结构进行pushover分析计算，对于高层框架剪力墙结构，必须组合高阶模态的滞回耗能计算结果。

Computation of structural hysteretic energy based on MPA procedure

In the seismic analysis based on the energy concept,the hysteretic energy is one of the important parameters for estimating the plastic cumulative damage to structures under strong ground motion.However,the hysteretic energy of MDOF system is usually computed by non-linear response history analysis(RHA) procedure,which requires great computational effort.To overcome this limitation,a simple procedure is presented in this paper for estimating the hysteretic energy demand of MDOF systems based on the modal pu...