地震作用下非规则多跨连续梁桥横向碰撞效应研究
发布时间：2018-12-08 18:10
【摘要】：在工程实践中,进行桥梁结构地震反应分析时通常忽略挡块的影响。近年来学界逐渐关注桥梁横向碰撞问题,但现有研究所针对的结构形式都较为简单,而且对挡块特性的考虑也不完善,与挡块力学性能的研究间仍缺乏较好的衔接与结合。为了探究地震作用下非规则多跨连续梁桥的横向碰撞效应,对结构地震反应做出更切实的预测与判断,提高该类桥梁的防震减灾能力,本文进行了以下逐步深入的研究工作:(1)建立了考虑支座非线性与桩-土相互作用的桥梁横向碰撞分析模型,研究了横向碰撞特征及其对结构地震反应的影响,并对主要影响因素进行了参数分析。结构表明:横向碰撞限制梁体位移,但产生的碰撞力增大了桥墩内力与各墩受力分布的不均匀性;增大接触刚度可提高限位能力,但过大的接触刚度会使桥墩受力过大;初始间隙较小时,导致的碰撞力与墩底弯矩较大。(2)提出了综合考虑混凝土挡块性能以及梁体与挡块碰撞效应的模拟分析方法,考察了混凝土挡块特性对结构地震反应的影响,分析了主要性能参数的影响规律。结果表明:挡块强度对混凝土挡块抗震性能有重要影响,挡块强度越大,梁墩相对位移越小,但过大的挡块强度也会导致极大的桥墩内力;提高挡块变形能力可有效减小碰撞力与挡块损伤;初始间隙过小时限位效果并不理想。(3)建构了钢挡块力学性能模拟与分析模型,在桥梁横向碰撞效应分析中探究了钢挡块特性对结构地震反应的影响,并对其主要性能参数进行了分析。结果表明:钢挡块的抗震性能主要受屈服强度的影响,增大屈服强度可有效提高限位能力,但过大的屈服强度也会极大地增加桥墩受力;弹性刚度的影响类似,但程度远不及屈服强度;初始间隙过小并不利于预定限位目标的实现。(4)比较了不同类型挡块的作用效果,对其抗震性能进行了评价。结果表明:不考虑普通挡块的屈服或破坏,会高估其限位能力与桥墩受力;强度是挡块限位与传力机制的关键,取值过大,即如理想弹性挡块,限位佳而使桥墩受力大,取值过小,则挡块损害严重,限位作用难以发挥;钢挡块比混凝土挡块的限位能力更优。(5)采用在挡块前加设橡胶垫片的减碰措施,给出了各类型挡块前加设橡胶垫片后的力学分析模型,探讨了橡胶垫片在不同类型挡块上的减碰效果以及其主要设计参数的影响。结果表明:理想弹性挡块应当加设橡胶垫片,能够显著减小碰撞力与桥墩受力;混凝土挡块宜加设橡胶垫片,能进一步减小梁墩相对位移与碰撞力,减轻挡块损伤;钢挡块可加设橡胶垫片以提高限位能力;可适当增加橡胶垫片厚度,但不宜塞满初始间隙。
[Abstract]:In engineering practice, the influence of block is usually neglected in seismic response analysis of bridge structure. In recent years, scholars have paid more and more attention to the transverse impact of bridges, but the structural forms of the existing research are relatively simple, and the consideration of block characteristics is not perfect, and there is still a lack of good connection and integration between the research on the mechanical properties of the block and the research on the mechanical properties of the block. In order to investigate the transverse collision effect of irregular multi-span continuous beam bridges under earthquake action, the earthquake response of structures is predicted and judged more effectively, and the ability of earthquake prevention and mitigation is improved. In this paper, the following research works are carried out: (1) the transverse collision analysis model of bridge considering the nonlinear bearing and pile-soil interaction is established, and the characteristics of transverse collision and its influence on the seismic response of the structure are studied. The main influencing factors are analyzed. The structure shows that the transverse impact limits the beam displacement, but the impact force increases the inhomogeneity between the internal force of the pier and the force distribution of the pier, and increases the contact stiffness to increase the limit capacity, but the excessive contact stiffness will cause the pier to bear too much force. When the initial gap is small, the impact force and the bending moment at the bottom of the pier are larger. (2) A simulation analysis method considering the concrete blocking performance and the collision effect between beam and block is proposed. The influence of block retaining characteristics of concrete on the seismic response of structures is investigated and the influence law of main performance parameters is analyzed. The results show that block strength has an important effect on the seismic performance of concrete retaining block. The larger the block strength, the smaller the relative displacement of beam pier, but too large block strength will also lead to great internal force of bridge pier. The collision force and block damage can be effectively reduced by improving the deformation ability of the block. The limited effect of initial clearance is not ideal. (3) the simulation and analysis model of mechanical properties of steel retaining block is constructed, and the influence of steel block characteristics on structural seismic response is explored in the analysis of transverse impact effect of bridge. The main performance parameters are analyzed. The results show that the seismic behavior of steel block is mainly affected by yield strength. Increasing yield strength can effectively improve the limit capacity, but too much yield strength will greatly increase the force of pier. The effect of elastic stiffness is similar, but the degree is far less than yield strength, and the small initial clearance is not conducive to the realization of predetermined limit target. (4) the effect of different types of block is compared and its seismic performance is evaluated. The results show that the limit capacity and pier force will be overestimated without considering the yield or failure of common block. The strength is the key of the blocking block limit and force transfer mechanism, the value is too large, that is, if the ideal elastic block, the limit is good to make the bridge pier force large, too small, the block damage is serious, the limit function is difficult to play; The limit capacity of steel block is better than that of concrete block. (5) the mechanical analysis model of rubber gasket in front of each type of block is given by means of anti-collision measure of adding rubber gasket in front of retaining block. The impact reduction effect of rubber gasket on different types of block and the influence of its main design parameters are discussed. The results show that the ideal elastic block should be equipped with rubber gasket, which can significantly reduce the impact force and the force of the bridge pier, and the concrete block should be equipped with rubber gasket, which can further reduce the relative displacement and impact force of the beam pier and reduce the damage of the block. Rubber gasket can be added to the steel block to improve the limit capacity, and the thickness of rubber gasket can be increased appropriately, but the initial clearance should not be filled.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55
本文编号：2368782
[Abstract]:In engineering practice, the influence of block is usually neglected in seismic response analysis of bridge structure. In recent years, scholars have paid more and more attention to the transverse impact of bridges, but the structural forms of the existing research are relatively simple, and the consideration of block characteristics is not perfect, and there is still a lack of good connection and integration between the research on the mechanical properties of the block and the research on the mechanical properties of the block. In order to investigate the transverse collision effect of irregular multi-span continuous beam bridges under earthquake action, the earthquake response of structures is predicted and judged more effectively, and the ability of earthquake prevention and mitigation is improved. In this paper, the following research works are carried out: (1) the transverse collision analysis model of bridge considering the nonlinear bearing and pile-soil interaction is established, and the characteristics of transverse collision and its influence on the seismic response of the structure are studied. The main influencing factors are analyzed. The structure shows that the transverse impact limits the beam displacement, but the impact force increases the inhomogeneity between the internal force of the pier and the force distribution of the pier, and increases the contact stiffness to increase the limit capacity, but the excessive contact stiffness will cause the pier to bear too much force. When the initial gap is small, the impact force and the bending moment at the bottom of the pier are larger. (2) A simulation analysis method considering the concrete blocking performance and the collision effect between beam and block is proposed. The influence of block retaining characteristics of concrete on the seismic response of structures is investigated and the influence law of main performance parameters is analyzed. The results show that block strength has an important effect on the seismic performance of concrete retaining block. The larger the block strength, the smaller the relative displacement of beam pier, but too large block strength will also lead to great internal force of bridge pier. The collision force and block damage can be effectively reduced by improving the deformation ability of the block. The limited effect of initial clearance is not ideal. (3) the simulation and analysis model of mechanical properties of steel retaining block is constructed, and the influence of steel block characteristics on structural seismic response is explored in the analysis of transverse impact effect of bridge. The main performance parameters are analyzed. The results show that the seismic behavior of steel block is mainly affected by yield strength. Increasing yield strength can effectively improve the limit capacity, but too much yield strength will greatly increase the force of pier. The effect of elastic stiffness is similar, but the degree is far less than yield strength, and the small initial clearance is not conducive to the realization of predetermined limit target. (4) the effect of different types of block is compared and its seismic performance is evaluated. The results show that the limit capacity and pier force will be overestimated without considering the yield or failure of common block. The strength is the key of the blocking block limit and force transfer mechanism, the value is too large, that is, if the ideal elastic block, the limit is good to make the bridge pier force large, too small, the block damage is serious, the limit function is difficult to play; The limit capacity of steel block is better than that of concrete block. (5) the mechanical analysis model of rubber gasket in front of each type of block is given by means of anti-collision measure of adding rubber gasket in front of retaining block. The impact reduction effect of rubber gasket on different types of block and the influence of its main design parameters are discussed. The results show that the ideal elastic block should be equipped with rubber gasket, which can significantly reduce the impact force and the force of the bridge pier, and the concrete block should be equipped with rubber gasket, which can further reduce the relative displacement and impact force of the beam pier and reduce the damage of the block. Rubber gasket can be added to the steel block to improve the limit capacity, and the thickness of rubber gasket can be increased appropriately, but the initial clearance should not be filled.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55
【相似文献】
相关期刊论文 前10条
1 刘殳,崔绍祥,徐钧;保证射野挡块制作质量的探讨[J];上海医学;2004年08期
2 林发生,潘建基,吴君心,陈传本;个体挡块制作的体会和质量保证[J];中华放射肿瘤学杂志;2003年04期
3 王旭芳;;定位挡块[J];铁道机车车辆工人;2007年10期
4 齐勇;欧阳水根;王小虎;高力英;;自制放疗适形挡块浇铸模具及其治疗中心质量控制[J];中国医学装备;2011年11期
5 黄小国;;挡块间隙对桥墩横桥向抗震性能的影响[J];地下工程与隧道;2011年04期
6 许祥;刘伟庆;徐秀丽;;新型抗震挡块的抗震性能[J];东南大学学报(自然科学版);2009年S2期
7 李志华;;浅谈侧向挡块施工的控制要点[J];科技创新导报;2012年17期
8 魏绪国;姜文;;介绍一种新型X线放疗适形挡块浇铸模具[J];医疗设备信息;2007年02期
9 王顺金;艾春红;罗晓东;;可快速脱模的X线挡块模具的制作[J];实用癌症杂志;2009年01期
10 贺相 ,刘利;定位挡块位置简易调整机构[J];组合机床与自动化加工技术;1990年08期
相关会议论文 前1条
1 王捷;郑富强;;三维放疗射野挡块数据转换及传输的研究[A];2008年中华临床医学工程及数字医学大会暨中华医学会医学工程学分会第九次学术年会论文集[C];2008年
相关重要报纸文章 前1条
1 本报记者 胡彦殊;彻底关大桥有望明日通车[N];四川日报;2009年
相关博士学位论文 前1条
1 刘鹏;地震作用下桥梁梁体与横向挡块动态碰撞研究[D];西南交通大学;2011年
相关硕士学位论文 前3条
1 汤振辉;桥梁抗震钢挡块计算方法与实验研究[D];重庆交通大学;2015年
2 夏人杰;地震作用下非规则多跨连续梁桥横向碰撞效应研究[D];西南交通大学;2017年
3 李蓓;地震作用下连续桥梁的横向碰撞及横向挡块的破坏机理研究[D];广西大学;2013年
，本文编号：2368782
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2368782.html
