长周期地震动的非弹性反应谱  

Inelastic response spectra of long-period ground motions

作　　者：李宇[1] 王佳豪 范陆 殷东朔 李琛[2] LI Yu;WANG Jiahao;FAN Lu;YIN Dongshuo;LI Chen(School of Highway,Chang’an University,Xi’an 710064,China;School of Architecture,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学建筑学院,陕西西安710061

出　　处：《河海大学学报（自然科学版）》2023年第2期138-149,共12页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51408042);陕西省自然科学基础研究计划(2022JQ-507,2023-JC-YB-438);重庆市在渝院士牵头创新引导专项(2022YSZX-JSX0003CSTB)。

摘　　要：根据长周期地震动的特性,选取139条长周期地震动记录,以分析结构动力参数和长周期地震动特性对长周期地震动非弹性反应谱的影响规律。研究结果表明:与常规地震动相比,恢复力模型和屈服后刚度比(η)对地震动非弹性反应谱中长周期段的影响较大,且场地土对非弹性反应谱的放大效应更为显著;相反,阻尼比(ξ)和位移延性比(μ)对常规和长周期地震动非弹性反应谱的影响规律较为类似。提出在建立长周期地震动设计谱时,应选取合理的恢复力模型和η,参考已有ξ和μ对常规地震动反应谱的影响规律,并针对不同的场地类型建立相应的设计谱;可以先建立某标准设防烈度的长周期地震动的设计谱,其他设防烈度的设计谱可用PGA_(设防)与PGA_(标准)的比值调整得到。According to the characteristics of long-period ground motions(GMs),139 long-period GM records are selected to study the influence of structural dynamic parameters and long-period GM characteristics on the inelastic response spectra of long-period GMs.The following conclusions are obtained:compared with conventional GMs,the influence of the restoring force model and the post-yield stiffness ratio(η)on the spectral values of the medium-and long-periods of inelastic response spectra is larger,and the amplification effect of site soil on the inelastic response spectra is more significant;on the contrary,the effects of damping ratio(ξ)and displacement ductility ratio(μ)on the inelastic response spectra of conventional and long-period GMs are similar.Therefore,when establishing the design spectra of long-period GMs,it is necessary to select a reasonable restoring force model andη,while the existing influence law ofξandμon the conventional GM response spectra can be referred to,and the corresponding design spectra should be established according to different types of site soil;moreover,the design spectra of long-period GMs of a standard fortification intensity can be established first,and then the design spectra of other fortification intensities can be adjusted by the ratio of PGA_(fortification) and PGA_(standard).

关 键 词：长周期地震动 非弹性反应谱 地震峰值加速度 屈服后刚度比 阻尼比 位移延性比 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]