白布河大桥结构静动力特性研究

发布时间：2019-01-14 17:01

【摘要】：连续刚构桥自问世以来，凭借其良好的受力性能、抗震能力、行车舒适度、施工方便、造型简洁美观等优点，被广泛应用于城市、高等级公路等桥梁。目前，随着国家西部大开发战略的深入，西部地区的交通事业发展迅速。由于部分地区受到环境限制，连续刚构桥在跨径或墩高的设置上采取了不对称布置。但是大多数不对称连续刚构桥的设计、施工仍然是参照对称连续刚构桥，而事实上，，桥梁的不对称性对结构还是有影响的，比如：主梁中、边跨比不理想，对桥梁的施工方案的确定、结构内力和变形控制等造成一定的难度；由于结构不对称，收缩徐变、温度变化等因素所引起的主梁内力、变形以及桥墩受力都会与对称结构有一定差异，并且结构不对称程度越大，这种差异就体现的越明显。本论文的依托工程——白布河大桥为跨径和墩高均不对称的连续刚构桥，在文中使用有限元软件Midas/Civil对桥梁进行了以下研究：（1）建立白布河大桥施工阶段模型，对大桥在施工阶段的最大拉、压应力作出分析；分别建立成桥及成桥后3年、10年的有限元模型，并研究其在成桥阶段结构的位移、应力，以及混凝土收缩徐变对结构位移、应力的影响。（2）以白布河大桥的原始模型为基础，分别建立1、2号墩高之比从0.17~1.00的16个有限元模型，分析各个模型中结构在成桥恒载、系统升（降温）、混凝土收缩徐变作用下的内力、位移，研究墩高的不对称性对于白布河大桥结构内力、位移的影响。（3）对白布河大桥做动力有限元分析，使用反应谱法对白布河大桥做地震响应分析，研究白布河大桥结构的不对称性对其动力特性及地震响应的影响。
[Abstract]:Continuous rigid frame bridge has been widely used in cities, high grade highways and other bridges because of its good mechanical performance, seismic resistance, driving comfort, convenient construction, simple and beautiful shape, etc. At present, with the development of the western region, the transportation industry in the western region is developing rapidly. Due to the environmental constraints in some areas, the continuous rigid frame bridges are arranged asymmetrically in the setting of span or pier height. However, the design and construction of most asymmetric continuous rigid frame bridges are still referred to the symmetrical continuous rigid frame bridges, but in fact, the asymmetry of the bridges still has an effect on the structure. For example, in the main girder, the ratio of side to span is not ideal. It is difficult to determine the construction scheme of the bridge, control the internal force and deformation of the structure. Due to the structural asymmetry, shrinkage and creep, temperature change and other factors caused by the main beam internal force, deformation and pier force will be different from the symmetrical structure, and the greater the degree of structural asymmetry, the more obvious this difference is. The supporting project of this thesis, Baibuhe Bridge, is a continuous rigid frame bridge with asymmetric span and pier height. In this paper, the bridge is studied by finite element software Midas/Civil: (1) the model of the construction stage of Baibuhe River Bridge is established. The maximum tensile and compressive stress of the bridge in the construction stage is analyzed. The finite element models of the bridge were established for 3 years and 10 years after the completion of the bridge, and the effects of the displacement, stress, shrinkage and creep of concrete on the displacement and stress of the structure were studied. (2) based on the original model of Baibuhe Bridge, 16 finite element models with the ratio of height of pier 1 and 2 from 0.17 to 1.00 are established respectively. The influence of the asymmetry of pier height on the internal force and displacement of Baibuhe Bridge is studied. (3) dynamic finite element analysis of Baibuhe River Bridge and seismic response analysis of Baibuhe Bridge using response spectrum method are carried out, and the influence of structural asymmetry of Baibuhe Bridge on its dynamic characteristics and seismic response is studied.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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