【摘要】 以4个不同层数的平面钢框架模型为例,选取14条满足场地条件的长持时地震波,以基于能量的损伤指标为参数进行易损性分析,并对比以层间位移角和顶点位移角为参数的分析结果,发现在长持时地震作用下,必须考虑累积损伤对结构抗震性能的影响。基于Park-Ang地震损伤模型,提出综合考虑最大层间位移角和能量损伤指标的双参数损伤模型。基于地震安全性分析,求出不同损伤指标的年均超越概率曲线,并对本文设计的平面钢框架模型的临界倒塌层间位移角进行折减修正。更多还原

【Abstract】 Take four plane steel frame models with different stories for example,14 seismic waves with long duration that met the site conditions were selected to conduct structural vulnerability analysis based on the damage index of energy.The results of the analyses were compared based on index of inter-story drift angle and roof story drift angle.It shows that the effect of cumulative damage on seismic performance of structures must be taken into consideration if the duration of earthquakes is long.Based on the Park-Ang seismic damage model,a two-parameter damage model that considering both inter-story drift angle and energy-based damage index was put forward.Based on seismic safety analysis,the mean annual rates of exceedance of different damage indexes were obtained and a reduction correction was conducted to critical collapse inter-story drift angle of the plane steel frame designed herein.更多还原