【摘要】：依據(jù)國內(nèi)外規(guī)范對近場地震動的定義,收集了215條近場地震動,進而對近場地震彈塑性反應(yīng)譜(加速度譜、位移譜、殘余位移譜、強度折減系數(shù)譜)進行參數(shù)影響研究,得到地震動特性(地震震級、場地土質(zhì)、PGA)和恢復力模型動力參數(shù)(不同恢復力模型、屈服后剛度比、阻尼比、位移延性系數(shù))等因素對近場地震彈塑性反應(yīng)譜的影響規(guī)律。與中遠場地震彈塑性反應(yīng)譜相比較可知:(1)Ⅰ~Ⅲ類場地近場地震彈塑性加速度譜的下降段較緩,Ⅳ類場地彈塑性加速度譜的敏感區(qū)更寬;(2)Ⅰ~Ⅲ類場地近場地震彈塑性位移譜的譜值相比Ⅳ類場地的譜值更大。在此基礎(chǔ)上,建立了與我國橋梁抗震設(shè)計規(guī)范場地類型相對應(yīng)的近場地震彈塑性反應(yīng)譜,可用于近場地震下的橋梁抗震設(shè)計,并可為后續(xù)的近場地震能力譜法的研究提供近場地震需求譜。
[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，

本文編號：2306892