本文選題：高架連續(xù)梁橋 + 近斷層地震　； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：近斷層地震動(dòng)近些年來開始引起工程界重視,因?yàn)槠湎鄬?duì)于遠(yuǎn)場(chǎng)地震動(dòng)來說有自身的特點(diǎn),如速度時(shí)程中包含的大脈沖和長(zhǎng)周期成分含量高等,以往的抗震設(shè)計(jì)經(jīng)驗(yàn)和抗震規(guī)范都沒有對(duì)其做到足夠的考慮,隨著很多地震中近斷層區(qū)域橋梁的嚴(yán)重破壞,對(duì)近斷層地震動(dòng)的專門考慮是十分必要的。高架橋橋墩比較高,柔度比較大,在近斷層地震作用下更能夠激發(fā)出長(zhǎng)周期大位移的振型,從而破壞比較嚴(yán)重。本文在已有的研究基礎(chǔ)上,總結(jié)了已有文獻(xiàn)對(duì)近斷層地震動(dòng)的研究和描述,然后以某一四跨高架連續(xù)梁橋作為研究對(duì)象,進(jìn)行了系統(tǒng)的地震激勵(lì)響應(yīng)分析,主要內(nèi)容如下:總結(jié)近斷層地震動(dòng)文獻(xiàn)的研究成果,歸納了近斷層地震動(dòng)加速度時(shí)程的特點(diǎn),選取了集集地震動(dòng)記錄中的典型的幾條地震動(dòng)加速度時(shí)程,和常用的El-Centro波以及人工合成波,區(qū)分近斷層和遠(yuǎn)場(chǎng)的區(qū)別作為輸入地震波。建立了一聯(lián)四跨連續(xù)梁橋空間有限元模型,比較了近斷層地震波激勵(lì)下高架橋結(jié)構(gòu)的動(dòng)力反應(yīng)和其他地震波激勵(lì)下的區(qū)別。在橋臺(tái)伸縮縫處加入了碰撞單元,進(jìn)一步分析在考慮碰撞的情況下近斷層地震激勵(lì)下高架連續(xù)梁橋的動(dòng)力反應(yīng)。并比較了不同橋墩高度情況下連續(xù)梁橋的碰撞響應(yīng)特點(diǎn),并對(duì)此進(jìn)行了總結(jié)。最后選取了幾種可靠性比較高的被動(dòng)減隔震裝置:Lockup裝置、粘滯阻尼器和鉛芯橡膠支座,安裝于滑動(dòng)墩以及橋臺(tái)上,區(qū)分近場(chǎng)和遠(yuǎn)場(chǎng)地震激勵(lì),計(jì)算分析了這三種減隔震裝置的減隔震效果,并對(duì)不同的地震波激勵(lì)做了減隔震效果的比較,并對(duì)高架連續(xù)梁橋的抗震設(shè)計(jì)給出了建議。
[Abstract]:In recent years, near-fault ground motion has attracted the attention of the engineering community, because it has its own characteristics relative to the far-field ground motion, such as the high content of large pulses and long-period components in the velocity process, etc. Previous seismic design experience and seismic code have not been considered enough. With the serious damage of bridge near fault area in many earthquakes, it is very necessary to consider the near-fault earthquake. The pier of viaduct is relatively high and the flexibility of viaduct is large. The vibration mode of long period and large displacement can be excited under the action of near-fault ground earthquake and the damage is more serious. On the basis of existing research, this paper summarizes the research and description of near-fault ground earthquake, and then takes a four-span viaduct continuous beam bridge as the research object, and makes a systematic analysis of seismic excitation response. The main contents are as follows: summarize the research results of near-fault seismic dynamic literature, sum up the characteristics of near-fault seismic acceleration time history, select several typical ground motion acceleration time history in collecting ground motion record, The difference between near fault and far field is used as input seismic wave with El-Centro wave and synthetic wave. The spatial finite element model of a four-span continuous beam bridge is established, and the difference between the dynamic response of viaduct structure under near-fault ground seismic wave excitation and that of other seismic waves is compared. A collision element is added to the bridge abutment expansion joint to further analyze the dynamic response of the elevated continuous beam bridge under near-fault earthquake excitation. The impact response characteristics of continuous beam bridges with different piers height are compared and summarized. In the end, several kinds of passive isolation devices with high reliability, namely, the structure of the passive isolation device, the viscous damper and the lead rubber bearing, are selected and installed on the sliding pier and abutment to distinguish the near-field and far-field seismic excitation. The effects of the three kinds of isolation devices are calculated and analyzed, and the seismic isolation effects of different seismic waves are compared, and some suggestions for seismic design of elevated continuous beam bridges are given.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55

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本文編號(hào)：1909613