長(zhǎng)橋限位墩防落梁抗震性能初步研究
發(fā)布時(shí)間：2018-10-09 15:25
【摘要】：地震作為一種破壞力巨大的自然災(zāi)害,在歷次大地震中都給人們生命財(cái)產(chǎn)帶來了很大的危害。橋梁作為支持社會(huì)經(jīng)濟(jì)發(fā)展的基礎(chǔ)設(shè)施,在災(zāi)后的救援與恢復(fù)建設(shè)中也將發(fā)揮舉足輕重的作用。隨著西部大開發(fā)的進(jìn)行,大量的梁式橋蜿蜒分布在西部的大地上,而梁式橋最大震害莫過于落梁震害。西部地區(qū)也是我國(guó)主要的高烈度地震區(qū)之一,據(jù)汶川地震調(diào)查報(bào)告顯示,處在高烈度地區(qū)中的橋梁大約一千四百多座,全橋失效的橋梁共有五十多座,占了總數(shù)的百分之四左右,其中百花大橋、廟子坪大橋、高樹大橋等都發(fā)生了落梁破壞。主梁移位大造成的落梁幾乎都是每次大地震橋梁最嚴(yán)重的破壞,許多研究人員對(duì)于防落梁措施進(jìn)行了研究,鑒于橋臺(tái)的限位作用,有研究者提出了一種剛度較大的抗震制動(dòng)墩,設(shè)置在長(zhǎng)橋中起到類似于橋臺(tái)的作用,目前,對(duì)抗震制動(dòng)墩的研究分析還較少,本文對(duì)限位墩應(yīng)用在長(zhǎng)橋中的抗震性能進(jìn)行了初步探索,主要做了以下工作:(1)參閱了大量國(guó)內(nèi)外關(guān)于防落梁方面的文獻(xiàn),對(duì)目前橋梁限位方法研究的現(xiàn)狀做了較系統(tǒng)的闡述,并在歷次震害的基礎(chǔ)上總結(jié)了目前落梁震害發(fā)生的機(jī)理。(2)對(duì)于高烈度地區(qū)主梁表現(xiàn)出移位率和移位程度隨橋梁長(zhǎng)度的增加而增加的特點(diǎn),在不同地震加速度峰值作用下對(duì)三種跨徑不同的長(zhǎng)橋做了動(dòng)力響應(yīng)分析,主要分析了長(zhǎng)橋隨著長(zhǎng)度的增加墩梁相對(duì)位移變化的情況。(3)針對(duì)在地震荷載作用下對(duì)長(zhǎng)橋墩梁相對(duì)位移有影響的參數(shù)(伸縮縫間隙,伸縮縫數(shù)量,墩高)進(jìn)行了研究,以midas civil有限元分析軟件為平臺(tái),通過非線性時(shí)程分析,分析長(zhǎng)橋在不同參數(shù)作用下的地震響應(yīng),主要分析了各參數(shù)對(duì)墩梁相對(duì)位移的影響。(4)在對(duì)長(zhǎng)橋抗震性能分析的基礎(chǔ)上,考慮了限位墩的作用,選用了具有代表性的六聯(lián)長(zhǎng)橋,在El-centro地震波的作用下分析了限位墩的作用效果。之后對(duì)限位墩在不同橋長(zhǎng)中的應(yīng)用做了系統(tǒng)的分析。(5)限位墩作為一個(gè)接受主梁碰撞的限位裝置,碰撞力引起較大的墩底彎矩。以限位墩剛度作為一個(gè)重要的分析參數(shù),在不同剛度情況下對(duì)全橋的動(dòng)力響應(yīng)進(jìn)行了分析,得到了墩梁相對(duì)位移隨限位墩剛度變化的曲線。(6)限位墩作為一個(gè)有效的防落梁設(shè)施,對(duì)于其位置的確定尤為關(guān)鍵,本文以平原地形和坡地地形為例,簡(jiǎn)要分析了在兩種地形下的限位墩布置的原則。(7)限位墩墩頂伸縮縫是影響主梁與限位墩擋墻發(fā)生碰撞的重要因素,本文以伸縮縫間隙大小為參數(shù),分析了限位墩墩頂伸縮縫間隙大小不同時(shí)對(duì)整個(gè)橋梁抗震性能的影響。
[Abstract]:As a destructive natural disaster, earthquake has brought great harm to people's life and property. As the infrastructure to support social and economic development, bridge will also play an important role in disaster relief and recovery construction. With the development of the western region, a large number of beam bridges are distributed in the western land, and the greatest earthquake damage of the beam bridges is the falling beam damage. The western region is also one of the main high-intensity earthquake areas in China. According to the Wenchuan earthquake survey report, there are about 1400 bridges in high-intensity areas, and more than 50 bridges have failed in the whole bridge. About 4% of the total, including Baihua Bridge, Miaoziping Bridge, Gaoshu Bridge, etc. The falling beam caused by the large displacement of the main beam is almost the most serious damage of the bridge caused by every big earthquake. Many researchers have studied the measures of preventing the falling beam. In view of the limit effect of abutment, some researchers have proposed a kind of seismic brake pier with high stiffness. Setting in the long bridge plays a similar role to the abutment. At present, the research and analysis of seismic brake pier is still relatively few. This paper makes a preliminary exploration on the seismic performance of the limited pier applied in the long bridge. The main works are as follows: (1) reference to a large number of domestic and foreign literature on anti-drop beam, the current research status of bridge limit method has been systematically expounded. On the basis of the previous earthquake damage, the mechanism of the earthquake damage of the beam drop is summarized. (2) for the high intensity area, the displacement rate and the displacement degree of the main beam increase with the increase of the bridge length. The dynamic responses of three long-span bridges with different spans are analyzed under the action of different acceleration peaks. The variation of relative displacement of pier beam with the increase of length of long bridge is analyzed. (3) the parameters (space of expansion joint, number of joints, height of pier) that influence the relative displacement of pier beam under earthquake load are studied. On the platform of midas civil finite element analysis software, the seismic response of long bridge under different parameters is analyzed by nonlinear time history analysis, and the influence of each parameter on the relative displacement of pier beam is mainly analyzed. (4) based on the analysis of seismic behavior of long bridge, Considering the role of the limited pier, the effect of the limited pier is analyzed under the action of El-centro seismic wave. Then the application of limited pier in different bridge length is systematically analyzed. (5) as a limit device to accept the impact of main beam, the impact force causes a large bending moment of pier bottom. Taking the stiffness of the limited pier as an important analysis parameter, the dynamic response of the whole bridge is analyzed under different stiffness conditions, and the curve of the relative displacement of the pier beam with the stiffness of the limited pier is obtained. (6) the limited pier is an effective anti-falling beam facility. For the determination of its location, this paper takes plain terrain and slope terrain as examples. The principle of layout of limited pier under two kinds of terrain is briefly analyzed. (7) the expansion joint at the top of limited pier is an important factor affecting the collision between the main beam and the retaining wall of the limited pier. In this paper, the size of the expansion joint clearance is taken as the parameter. The influence of the clearance on the seismic behavior of the bridge is analyzed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55
[Abstract]:As a destructive natural disaster, earthquake has brought great harm to people's life and property. As the infrastructure to support social and economic development, bridge will also play an important role in disaster relief and recovery construction. With the development of the western region, a large number of beam bridges are distributed in the western land, and the greatest earthquake damage of the beam bridges is the falling beam damage. The western region is also one of the main high-intensity earthquake areas in China. According to the Wenchuan earthquake survey report, there are about 1400 bridges in high-intensity areas, and more than 50 bridges have failed in the whole bridge. About 4% of the total, including Baihua Bridge, Miaoziping Bridge, Gaoshu Bridge, etc. The falling beam caused by the large displacement of the main beam is almost the most serious damage of the bridge caused by every big earthquake. Many researchers have studied the measures of preventing the falling beam. In view of the limit effect of abutment, some researchers have proposed a kind of seismic brake pier with high stiffness. Setting in the long bridge plays a similar role to the abutment. At present, the research and analysis of seismic brake pier is still relatively few. This paper makes a preliminary exploration on the seismic performance of the limited pier applied in the long bridge. The main works are as follows: (1) reference to a large number of domestic and foreign literature on anti-drop beam, the current research status of bridge limit method has been systematically expounded. On the basis of the previous earthquake damage, the mechanism of the earthquake damage of the beam drop is summarized. (2) for the high intensity area, the displacement rate and the displacement degree of the main beam increase with the increase of the bridge length. The dynamic responses of three long-span bridges with different spans are analyzed under the action of different acceleration peaks. The variation of relative displacement of pier beam with the increase of length of long bridge is analyzed. (3) the parameters (space of expansion joint, number of joints, height of pier) that influence the relative displacement of pier beam under earthquake load are studied. On the platform of midas civil finite element analysis software, the seismic response of long bridge under different parameters is analyzed by nonlinear time history analysis, and the influence of each parameter on the relative displacement of pier beam is mainly analyzed. (4) based on the analysis of seismic behavior of long bridge, Considering the role of the limited pier, the effect of the limited pier is analyzed under the action of El-centro seismic wave. Then the application of limited pier in different bridge length is systematically analyzed. (5) as a limit device to accept the impact of main beam, the impact force causes a large bending moment of pier bottom. Taking the stiffness of the limited pier as an important analysis parameter, the dynamic response of the whole bridge is analyzed under different stiffness conditions, and the curve of the relative displacement of the pier beam with the stiffness of the limited pier is obtained. (6) the limited pier is an effective anti-falling beam facility. For the determination of its location, this paper takes plain terrain and slope terrain as examples. The principle of layout of limited pier under two kinds of terrain is briefly analyzed. (7) the expansion joint at the top of limited pier is an important factor affecting the collision between the main beam and the retaining wall of the limited pier. In this paper, the size of the expansion joint clearance is taken as the parameter. The influence of the clearance on the seismic behavior of the bridge is analyzed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55
【參考文獻(xiàn)】
中國(guó)期刊全文數(shù)據(jù)庫 前2條
1 王東升;孫治國(guó);郭迅;李曉莉;霍q，
本文編號(hào)：2259825
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