【摘要】：依據(jù)國(guó)內(nèi)外規(guī)范對(duì)近場(chǎng)地震動(dòng)的定義,收集了215條近場(chǎng)地震動(dòng),進(jìn)而對(duì)近場(chǎng)地震彈塑性反應(yīng)譜(加速度譜、位移譜、殘余位移譜、強(qiáng)度折減系數(shù)譜)進(jìn)行參數(shù)影響研究,得到地震動(dòng)特性(地震震級(jí)、場(chǎng)地土質(zhì)、PGA)和恢復(fù)力模型動(dòng)力參數(shù)(不同恢復(fù)力模型、屈服后剛度比、阻尼比、位移延性系數(shù))等因素對(duì)近場(chǎng)地震彈塑性反應(yīng)譜的影響規(guī)律。與中遠(yuǎn)場(chǎng)地震彈塑性反應(yīng)譜相比較可知:(1)Ⅰ~Ⅲ類場(chǎng)地近場(chǎng)地震彈塑性加速度譜的下降段較緩,Ⅳ類場(chǎng)地彈塑性加速度譜的敏感區(qū)更寬;(2)Ⅰ~Ⅲ類場(chǎng)地近場(chǎng)地震彈塑性位移譜的譜值相比Ⅳ類場(chǎng)地的譜值更大。在此基礎(chǔ)上,建立了與我國(guó)橋梁抗震設(shè)計(jì)規(guī)范場(chǎng)地類型相對(duì)應(yīng)的近場(chǎng)地震彈塑性反應(yīng)譜,可用于近場(chǎng)地震下的橋梁抗震設(shè)計(jì),并可為后續(xù)的近場(chǎng)地震能力譜法的研究提供近場(chǎng)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(hào)：2306892