【摘要】：在遠(yuǎn)場(chǎng)地震動(dòng)作用下鉛芯橡膠支座(Lead Rubber Bearing,簡(jiǎn)稱(chēng)LRB)以其優(yōu)異的減震效果而備受世人關(guān)注,而近斷層地震具有諸如速度脈沖效應(yīng)、上盤(pán)效應(yīng)和破裂方向性效應(yīng)等明顯異于遠(yuǎn)場(chǎng)地震的運(yùn)動(dòng)特征,這些運(yùn)動(dòng)特征可能會(huì)影響到LRB隔震支座的減震效果,所以研究近斷層地震動(dòng)作用下LRB隔震橋梁的抗震性能具有一定現(xiàn)實(shí)意義。本文以鐵路連續(xù)梁橋?yàn)檠芯繉?duì)象,主要開(kāi)展了以下幾方面的研究:(1)在查閱大量國(guó)內(nèi)外文獻(xiàn)的基礎(chǔ)上,分析了鐵路橋梁的震害特征,評(píng)述了近斷層地震動(dòng)、橋梁減隔震技術(shù)、軌道約束作用和限位裝置等相關(guān)研究現(xiàn)狀;(2)針對(duì)連續(xù)梁橋制動(dòng)墩縱向地震內(nèi)力大的特點(diǎn),提出在主墩處安裝LRB隔震支座的減震方案。利用OpenSees軟件建立相關(guān)動(dòng)力計(jì)算模型,研究了LRB隔震支座的減震效果。結(jié)果表明,隔震后制動(dòng)墩的位移及內(nèi)力都大幅減小,最大減小幅度可達(dá)76.12%,LRB隔震支座表現(xiàn)出較好的減震效果。(3)通過(guò)比較發(fā)現(xiàn),速度脈沖效應(yīng)、上盤(pán)效應(yīng)和破裂方向性效應(yīng)等運(yùn)動(dòng)特征對(duì)LRB隔震連續(xù)梁橋縱向地震響應(yīng)都有一定放大作用,其中速度脈沖效應(yīng)的影響最大,方向性效應(yīng)次之,上盤(pán)效應(yīng)影響最小。(4)通過(guò)建立梁軌一體化動(dòng)力計(jì)算模型,分別研究了豎向無(wú)載和有載兩種工況下軌道對(duì)LRB隔震連續(xù)梁橋縱向地震響應(yīng)的影響。結(jié)果表明,軌道對(duì)LRB隔震連續(xù)梁橋縱向的地震響應(yīng)有一定減震作用,最大減小幅度可達(dá)25.50%,并且軌道在有載狀態(tài)下的減震作用比無(wú)載狀態(tài)下更顯著。(5)針對(duì)LRB隔震連續(xù)梁橋減震效果好但主梁位移較大的特點(diǎn),利用在邊墩的墩梁間安置粘滯阻尼器來(lái)控制主梁位移,并提出選取粘滯阻尼器參數(shù)的原則。研究結(jié)果表明,粘滯阻尼器可大幅減小主梁位移,輕微減小主墩內(nèi)力,同時(shí)還能保證邊墩處于彈性范圍內(nèi)。
[Abstract]:Under the action of far-field ground motion, (Lead Rubber Bearing, (LRB) has attracted much attention for its excellent damping effect, while near-fault ground earthquake has the effect of velocity pulse. The upper disk effect and rupture directional effect are obviously different from the motion characteristics of far field earthquake, which may affect the shock absorption effect of LRB isolation support. Therefore, it is of practical significance to study the seismic behavior of LRB isolated bridge under near-fault seismic action. In this paper, the railway continuous beam bridge is taken as the research object, and the following researches are carried out: (1) on the basis of consulting a large number of literatures at home and abroad, the earthquake damage characteristics of railway bridges are analyzed, and the near-fault ground earthquakes are reviewed. The status quo of bridge isolation technology, track restraint and location-limiting devices; (2) according to the characteristics of large longitudinal earthquake internal force of brake pier of continuous beam bridge, a shock absorption scheme of installing LRB isolation support at main pier is put forward. Using OpenSees software to establish the related dynamic calculation model, the damping effect of LRB isolation bearing is studied. The results show that the displacement and internal force of the brake pier are greatly reduced after isolation, and the maximum reduction range can reach 76.12%. (3) through comparison, the velocity pulse effect is found. The upper disk effect and rupture directional effect have some magnification effect on the longitudinal seismic response of LRB isolated continuous beam bridge, among which the velocity pulse effect is the most important, and the directional effect is the second. (4) the influence of track on longitudinal seismic response of LRB isolated continuous beam bridge is studied by establishing the integrated dynamic calculation model of beam and rail. The results show that the track has a certain damping effect on the longitudinal seismic response of LRB isolated continuous beam bridge, and the maximum reduction range can reach 25.50. Moreover, the seismic absorption of track is more significant than that of non-load state. (5) aiming at the characteristics of LRB isolated continuous beam bridge with good damping effect but large displacement of main beam, the displacement of main beam is controlled by installing viscous dampers between piers and beams of side piers. The principle of selecting the parameters of viscous dampers is put forward. The results show that the viscous damper can greatly reduce the displacement of the main beam, slightly reduce the internal force of the main pier, and ensure that the side pier is in the elastic range.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U442.55

【共引文獻(xiàn)】

相關(guān)期刊論文 前1條

1 宗周紅;夏堅(jiān);徐綽然;;橋梁高墩抗震研究現(xiàn)狀及展望[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年02期

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本文編號(hào)：2344672