基于能量分析的抗震设计与工程应用研究

基于工程实例进行了结构大震弹塑性时程分析,并对地震输入结构的总能量、结构构件滞回耗能、阻尼器耗能以及系统阻尼耗能进行分析。三个工程实例为无减震设计的某超高层建筑、采用防屈曲支撑设计的某大跨钢结构和采用粘滞阻尼器减震设计的某复杂连体结构。该研究方法不同于以往研究仅针对单自由度或简单多自由度系统的理论分析。分析结果表明,地震输入结构的总能量受地震波特性影响非常显著,要合理估计总输入能量是困难的,但各部分耗散能量占总输入能量的比值具有稳定性。

Energy-based seismic design and engineering application research

Nonlinear time-history analyses were carried out for three engineering applications,and energy analyses were presented for total input energy due to earthquake,energy dissipation by structural components,damper devices and system damping.The engineering applications include one ultra-high-rise building without energy dissipation design,one large-span steel structure using buckling-resistant braces,and one complicated connected structure using viscous dampers.This research is different from previous theoretical analysis based on single or multiple degree of freedom system.The analysis results show that total input energy due to earthquake is sensitive to the characteristics of ground motion and it is difficult to accurately evaluate the total input energy,however,the ratio of energy dissipation by components or devices to total energy is stable.