长桥限位墩防落梁抗震性能初步研究
发布时间：2018-10-09 15:25
【摘要】：地震作为一种破坏力巨大的自然灾害,在历次大地震中都给人们生命财产带来了很大的危害。桥梁作为支持社会经济发展的基础设施,在灾后的救援与恢复建设中也将发挥举足轻重的作用。随着西部大开发的进行,大量的梁式桥蜿蜒分布在西部的大地上,而梁式桥最大震害莫过于落梁震害。西部地区也是我国主要的高烈度地震区之一,据汶川地震调查报告显示,处在高烈度地区中的桥梁大约一千四百多座,全桥失效的桥梁共有五十多座,占了总数的百分之四左右,其中百花大桥、庙子坪大桥、高树大桥等都发生了落梁破坏。主梁移位大造成的落梁几乎都是每次大地震桥梁最严重的破坏,许多研究人员对于防落梁措施进行了研究,鉴于桥台的限位作用,有研究者提出了一种刚度较大的抗震制动墩,设置在长桥中起到类似于桥台的作用,目前,对抗震制动墩的研究分析还较少,本文对限位墩应用在长桥中的抗震性能进行了初步探索,主要做了以下工作:(1)参阅了大量国内外关于防落梁方面的文献,对目前桥梁限位方法研究的现状做了较系统的阐述,并在历次震害的基础上总结了目前落梁震害发生的机理。(2)对于高烈度地区主梁表现出移位率和移位程度随桥梁长度的增加而增加的特点,在不同地震加速度峰值作用下对三种跨径不同的长桥做了动力响应分析,主要分析了长桥随着长度的增加墩梁相对位移变化的情况。(3)针对在地震荷载作用下对长桥墩梁相对位移有影响的参数(伸缩缝间隙,伸缩缝数量,墩高)进行了研究,以midas civil有限元分析软件为平台,通过非线性时程分析,分析长桥在不同参数作用下的地震响应,主要分析了各参数对墩梁相对位移的影响。(4)在对长桥抗震性能分析的基础上,考虑了限位墩的作用,选用了具有代表性的六联长桥,在El-centro地震波的作用下分析了限位墩的作用效果。之后对限位墩在不同桥长中的应用做了系统的分析。(5)限位墩作为一个接受主梁碰撞的限位装置,碰撞力引起较大的墩底弯矩。以限位墩刚度作为一个重要的分析参数,在不同刚度情况下对全桥的动力响应进行了分析,得到了墩梁相对位移随限位墩刚度变化的曲线。(6)限位墩作为一个有效的防落梁设施,对于其位置的确定尤为关键,本文以平原地形和坡地地形为例,简要分析了在两种地形下的限位墩布置的原则。(7)限位墩墩顶伸缩缝是影响主梁与限位墩挡墙发生碰撞的重要因素,本文以伸缩缝间隙大小为参数,分析了限位墩墩顶伸缩缝间隙大小不同时对整个桥梁抗震性能的影响。
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
【参考文献】
中国期刊全文数据库 前2条
1 王东升;孙治国;郭迅;李晓莉;霍q，
本文编号：2259825
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