基于简化模型的Y型偏心支撑钢框架滞回性能分析

Analysis of hysteretic behavior of Y-shaped eccentrically braced steel frame based on simplified model

基于钢板剪力墙统一等代模型对剪切型耗能梁的腹板等效简化为交叉杆件单元,提出Y型偏心支撑钢框架结构的全杆件单元模型.采用SeismoStruct有限元软件建立1∶2缩尺Y型高强钢组合偏心支撑框架结构的等代简化模型,并对结构进行低周往复加载分析.将Y型偏心支撑钢框架结构简化模型结果与试验值进行比较,考察滞回曲线、骨架曲线、刚度退化曲线、强度退化曲线及耗能能力等方面的差异.研究表明,基于简化模型得到的有限元模拟结果与试验结果吻合良好,充分验证了采用提出的等代模型进行偏心支撑结构抗震性能研究的可靠性,为后续采用全杆件模型进行复杂模型的分析奠定基础.

Based on the uniform equivalent model of steel sheet-shear wall,the web of shear energy-dissipating beam was equivalent simplified to cross bar element.A full bar element model of Y-type eccentrically braced steel frame structure was proposed.Using the SeismoStruct finite element software,the equivalent simplified model of the 1∶2 scale Y-shaped composite eccentrically braced frame structure with high strength steel was established,and the low-cycle reciprocating loading analysis of the structure was conducted.The simplified model results of Y-type eccentrically braced steel frame structures were compared with the experimental values,and the differences in hysteresis curves,skeleton curves,stiffness degradation curves,strength degradation curves and energy dissipation capacity were investigated.The results show that the finite element simulation results based on the simplified model are in good agreement with the experimental results,which fully verifies the reliability of the seismic performance research of eccentric braced structures using the proposed equivalent model and lays a foundation for the analysis of complex model by using full bar model in the future.