Lateral force distribution based on inelastic state of Y-type high strength steel composite eccentrically braced frame during near-fault earthquakes
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摘要: 为研究近场地震作用下Y形高强钢组合偏心支撑框架结构（Y-HSS-EBF）的弹塑性侧向力分布，本文精细设计了4个不同层数的Y-HSS-EBF结构，通过弹塑性时程分析且考虑了结构层数、近场地震及其速度脉冲效应对结构的影响，获得了Y-HSS-EBF结构在罕遇水准近场地震下的侧向力分布，基于底部剪力法得到了Y-HSS-EBF结构弹塑性侧向力分布模式，并与已有侧向力分布模式进行了对比。结果表明：近场地震波的速度脉冲效应对Y-HSS-EBF结构的侧向力分布影响较大，应考虑其对结构侧向力分布的影响；本文建议的侧向力分布模式在精度上与时程分析结果平均值最为接近，能够为Y-HSS-EBF结构基于性能的塑性设计方法提供一定参考。Abstract: In order to investigate the lateral force distribution based on inelastic state of Y-type high strength steel composite eccentrically braced frame (Y-HSS-EBF) during the near-fault earthquakes, several Y-HSS-EBF models with different stories were established in this paper. Also, the effects of story number and velocity pulse of near-fault motions were considered. Nonlinear time history analyses were conducted to obtain the lateral force distribution of the structures during the rare near-fault earthquakes. The formula of lateral force distribution in inelastic state of Y-HSS-EBF was proposed based on equivalent base shear method in seismic design code, and it was compared with other lateral force distribution. Results indicate that near-fault earthquakes with velocity pulse had important effect to the lateral force distribution of Y-HSS-EBF, the lateral force distribution proposed in this paper was closest to the analysis results. The proposed lateral force distribution in this paper can be adopted for the performance-based plastic design (PBPD) method of Y-HSS-EBF.
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