远场地震下抗弯钢框架基于能量的性态设计方法

Performance-based seismic design of moment-resisting steel frame based on hysteretic energy spectrum under far-fault earthquakes

为合理考虑远场地震动的循环效应,结合能量平衡关系、标准化滞回耗能谱、累积延性比谱,提出了抗弯钢框架基于性态的抗震设计方法;给出了具体设计步骤,柱、梁累积滞回耗能计算公式及截面的设计方法;采用此方法设计了1榀5层3跨的抗弯钢框架,通过pushover及弹塑性时程分析评估了设计结构的抗震性能,证明了设计方法的可信性。

Taking into account the cyclic effect of ground motion acceleration＂ of the far-fault earthquake, a performance-based seismic design method of moment-resisting steel frame was proposed based on the accumulated hysteretic energy spectrum, the accumulated ductility ratio, and the hysteretic energy balance equation. In this paper, the calculating formulas of hysteric energy of the steel beam and column were constructed, and the determining method of the cross section of steel components was also proposed. A five-story, three-span steel frame was designed based on this new design method, and the seismic behavior was evaluated by the pushove analysis and the nonlinear time history method, and this method proved reliable.