远场地震作用下累积延性比谱的建立  

Establishment of Accumulated Ductility Ratio SpectrumUnder Far-field Earthquake

作　　者：马翠玲[1] 黄镜渟 MA Cuiling;HUANG Jingting(School of Urban Construction and Transportation,Hefei University,Hefei 230601)

机构地区：[1]合肥学院城市建设与交通学院,安徽合肥230601

出　　处：《常州工学院学报》2023年第5期13-20,34,共9页Journal of Changzhou Institute of Technology

基　　金：安徽省教育厅省级质量工程项目(2020kfkc455,2020jyxm1605);高校优秀拔尖人才培育资助项目(gxyq2020068);合肥学院人才科研基金项目(21-22RC39,21-22RC38)。

摘　　要：现行的建筑抗震设计规范采用基于强度的弹性设计方法,用非直接方式考虑结构强震下的弹塑性能。而基于能量的性态设计方法既兼顾力和位移两个因素,又能有效地考虑强震持时对结构造成的累积损伤。为研究结构的累积滞回耗能需求与结构单调推覆耗能之间的关系,引入累积延性比谱。通过分析地震波幅值、结构周期、阻尼比等因素对累积延性比谱的影响规律,建立了符合中国场地分类的累积延性比谱。结果显示:累积延性比谱与地震波幅值无关,与结构周期关系不大,可以忽略;当阻尼比和延性系数分别增大时,累积延性比呈增大趋势。另外,结构后期刚度、场地类别、设计地震分组对累积延性比谱均有不同程度的影响。The elastic design method based on strength,adopted in the current building seismic design code,estimates the elastic-plastic performance of the structure indirectly.The energy-based seismic design is known for the consideration of structural strength and displacement,and the cumulative damage caused by the ground motion.In order to clarify the relationship between accumulated hysteretic energy and one-way pushover energy,an accumulated ductility ratio spectrum is introduced.By analyzing the effects of some parameters,including the acceleration amplitude,the period,the damping ratio and so on,the mathematical expressions for an accumulated ductility ratio spectrum in accordance with the classification of Chinese soil sites can be obtained.The results show that the spectrum is independent of the acceleration amplitude and has little relation with the structure period,which can be neglected.With the respertive increase of damping ratio and ductility coefficient of structure,the cumulative ductility ratio increases.Furthermore,the post-yielding stiffness ratio,the soil type and the site group all have different effects on the accumulated ductility ratio spectrum1.

关 键 词：远场地震 累积延性比谱 基于能量抗震设计方法 

分 类 号：TU318[建筑科学—结构工程]