梁式桥抗震设计的近场地震弹塑性反应谱

发布时间：2018-11-02 20:41

【摘要】：依据国内外规范对近场地震动的定义,收集了215条近场地震动,进而对近场地震弹塑性反应谱(加速度谱、位移谱、残余位移谱、强度折减系数谱)进行参数影响研究,得到地震动特性(地震震级、场地土质、PGA)和恢复力模型动力参数(不同恢复力模型、屈服后刚度比、阻尼比、位移延性系数)等因素对近场地震弹塑性反应谱的影响规律。与中远场地震弹塑性反应谱相比较可知:(1)Ⅰ~Ⅲ类场地近场地震弹塑性加速度谱的下降段较缓,Ⅳ类场地弹塑性加速度谱的敏感区更宽;(2)Ⅰ~Ⅲ类场地近场地震弹塑性位移谱的谱值相比Ⅳ类场地的谱值更大。在此基础上,建立了与我国桥梁抗震设计规范场地类型相对应的近场地震弹塑性反应谱,可用于近场地震下的桥梁抗震设计,并可为后续的近场地震能力谱法的研究提供近场地震需求谱。
[Abstract]:According to the definition of near-field ground motion in codes at home and abroad, 215 near-field ground motions are collected, and the influence of parameters on the near field seismic elastic-plastic response spectrum (acceleration spectrum, displacement spectrum, residual displacement spectrum, intensity reduction coefficient spectrum) is studied. The effects of earthquake magnitude, site soil, PGA) and dynamic parameters of restoring force model (different restoring force model, yield stiffness ratio, damping ratio, displacement ductility coefficient) on the near field seismic elastoplastic response spectrum are obtained. Compared with the middle and far field seismic elastoplastic response spectra, it can be seen that: (1) the near field seismic elastoplastic acceleration spectra of type 鈪，

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