基于能量反应谱的抗弯钢框架结构能量计算

摘要

Total input energy and hysteretic energy of structures need to be evaluated reasonably in energy-based seismic design. A total of 12 near-fauh and far-fault ground motion records are selected to construct input energy spectrum and hysteretic spectrum, and a simple procedure is presented in this paper for estimating the total input energy and hysteretic energy demand of MDOF systems based on energy spectrums. The energy of three moment-resisting steel frames of different stories is evaluated using nonlinear time history method. The results indicate that the simplified procedure based on energy spectrums has high accuracy, and the contributions of higher modes can be taken into consideration for high- rise structures, especially when subjected to earthquake waves sensitive to high modes.%基于能量的抗震性态设计方法需要合理估计实际结构的地震动输入能量及滞回耗能，以近场、远场地震动记录各6条作为输入，建立两组地震动总输入能及滞回耗能的等效速度谱，提出根据能量反应谱估计多自由度体系能量的计算方法。采用弹塑性时程分析法对3个不同层数的钢框架算例评估能量计算方法的合理性。结果表明：基于能量反应谱计算多自由度体系总输入能及滞回耗能的方法精度良好，结果可靠。对高层结构或结构遭受对高阶振型敏感的地震波，建议按该方法考虑高阶振型所携带能量。