K型偏心支撑钢框架基于能量的性态设计方法

Energy-based seismic design method of K type steel eccentrically braced frame under near-fault earthquake

结构在近场地震作用下的损伤通常与强速度脉冲所携带的瞬时输入能量相关。因此,在基于能量的性态设计中,应以引起结构瞬间破坏的那部分能量作为设计依据。考虑近场地震动的强速度脉冲效应,基于最大有效滞回能(MECE)谱及能量平衡关系,提出了K型偏心支撑钢框架基于能量的性态设计方法,并采用此方法设计了一榀10层K型偏心支撑钢框架。通过对所设计结构进行Pushover分析和弹塑性时程分析评估了结构的抗震性能,验证了设计方法的可靠性。

The damage of buildings under near-fault earthquakes was related to the instantaneous input energy.The energy that caused the instant failure of structures should be picked up as a basis for the energy-based seismic design. Taking the velocity pulse effect of near-fault earthquake into account, this paper proposed an energy-based seismic design method of K type steel eccentrically braced frames based on the maximum effect cyclic energy spectrum and energy balance equation. Using the method mentioned above, a K type steel eccentrically braced frame of 10 story is designed, verifying the yield node of the structure by Pushover method and evaluating the seismic performance by the time history analysis. The method proves reasonable by the analysis of the seismic performance of the model.