超高墩连续刚构桥桥墩构造与主梁长期效应分析研究
发布时间：2019-04-20 14:18
【摘要】：随着国民经济的持续快速发展,中国交通事业尤其是西部交通建设得到前所未有的发展。受到山区特殊地形条件的限制,预应力混凝土连续刚构桥在山区公路中得到广泛运用。由于超高墩连续刚构桥结构构造需要具有一定的特殊性与针对性,对其结构构造也需要进行技术设计。为此,针对超高墩连续刚构桥构造设计与长期效应进行研究,具有一定的现实意义。 为了对超高墩连续刚构桥构造设计与长期效应进行研究,分析了连续刚构桥的构造形式及桥墩截面形式的研究方法,采用对比分析法及ANSYS有限元建模,就不同墩高条件下最大悬臂阶段与静风荷载下的弹性稳定性与工程数量进行了对比分析。同时,依托赫章特大桥,基于Midas/Civil有限元模型,探讨了连续刚构混凝土的收缩徐变、长期作用下预应力损失、主梁的变形。 研究表明： 1)当桥墩高度在150m以内时,采用双薄壁桥墩或组合式桥墩无论从经济上还是抗风稳定性方面都是合理的,当桥墩高度150m-175m时,宜采用组合式桥墩；当桥墩高度达到195m时,独墩构造形式具有明显的技术优势,不仅稳定性良好,而且工程用量最小。 2)由于高强度混凝土大量用于连续刚构桥的建设,特别是桥梁主要承重结构,考虑高强度混凝土的收缩、徐变所引起的预应力损失偏大。 3)预应力钢筋束的预应力损失、混凝土容重系数对主梁竖向挠度有显著的影响。
[Abstract]:With the sustained and rapid development of the national economy, China's transportation industry, especially in the western region, has been developed unprecedented. The prestressed concrete continuous rigid frame bridge is widely used in mountain highway because of the limitation of special terrain condition in mountain area. Because the structure of super-high pier continuous rigid frame bridge needs to have some particularity and pertinence, the technical design is also needed for the structure of super-high pier continuous rigid frame bridge. Therefore, it is of practical significance to study the structural design and long-term effect of ultra-high pier continuous rigid frame bridge. In order to study the structural design and long-term effect of continuous rigid frame bridge with ultra-high piers, the research methods of structure form and pier section form of continuous rigid frame bridge are analyzed. The comparative analysis method and ANSYS finite element model are used to build the model of continuous rigid frame bridge. The elastic stability and engineering quantity of maximum cantilever stage under different pier height and static wind load are compared and analyzed. At the same time, based on the Midas/Civil finite element model, the shrinkage and creep of continuous rigid frame concrete, the loss of prestress and the deformation of main beam under long-term action are discussed. The results show that: 1) when the pier height is within 150m, it is reasonable to adopt double thin-walled pier or composite pier in terms of economic and wind-resistant stability. When the pier height is 150m-175m, the composite pier should be adopted. When the pier height reaches 195m, the single pier structure has obvious technical advantages, not only the stability is good, but also the engineering usage is minimum. 2) because of the large amount of high strength concrete used in the construction of continuous rigid frame bridge, especially the main bearing structure of the bridge, considering the shrinkage of high strength concrete, the loss of prestress caused by creep is too large. 3) the loss of prestress and the coefficient of concrete bulk density have a significant effect on the vertical deflection of the main beam.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.23
本文编号：2461680
[Abstract]:With the sustained and rapid development of the national economy, China's transportation industry, especially in the western region, has been developed unprecedented. The prestressed concrete continuous rigid frame bridge is widely used in mountain highway because of the limitation of special terrain condition in mountain area. Because the structure of super-high pier continuous rigid frame bridge needs to have some particularity and pertinence, the technical design is also needed for the structure of super-high pier continuous rigid frame bridge. Therefore, it is of practical significance to study the structural design and long-term effect of ultra-high pier continuous rigid frame bridge. In order to study the structural design and long-term effect of continuous rigid frame bridge with ultra-high piers, the research methods of structure form and pier section form of continuous rigid frame bridge are analyzed. The comparative analysis method and ANSYS finite element model are used to build the model of continuous rigid frame bridge. The elastic stability and engineering quantity of maximum cantilever stage under different pier height and static wind load are compared and analyzed. At the same time, based on the Midas/Civil finite element model, the shrinkage and creep of continuous rigid frame concrete, the loss of prestress and the deformation of main beam under long-term action are discussed. The results show that: 1) when the pier height is within 150m, it is reasonable to adopt double thin-walled pier or composite pier in terms of economic and wind-resistant stability. When the pier height is 150m-175m, the composite pier should be adopted. When the pier height reaches 195m, the single pier structure has obvious technical advantages, not only the stability is good, but also the engineering usage is minimum. 2) because of the large amount of high strength concrete used in the construction of continuous rigid frame bridge, especially the main bearing structure of the bridge, considering the shrinkage of high strength concrete, the loss of prestress caused by creep is too large. 3) the loss of prestress and the coefficient of concrete bulk density have a significant effect on the vertical deflection of the main beam.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.23
【参考文献】
相关期刊论文 前10条
1 潘立本,陈蓓;用分段逼近法计算混凝土收缩与徐变引起的构件预应力损失[J];工程力学;1998年04期
2 杨高中,杨征宇,周军生,李强,宋贵峰;连续刚构桥在我国的应用和发展[J];公路;1998年06期
3 王银辉,吴剑敏,刘东;变截面空心薄壁墩的稳定计算[J];公路;2004年01期
4 潘志炎,史方华;高桥墩稳定性分析[J];公路;2004年09期
5 廖萍,李黎,彭元诚,陈宏伟;薄壁高墩连续刚构桥的线性稳定分析[J];公路;2005年04期
6 李准华;刘钊;;大跨度预应力混凝土梁桥预应力损失及敏感性分析[J];世界桥梁;2009年01期
7 姚强;柯亮亮;;连续刚构桥箱梁应力和跨中挠度与预应力损失的关系研究[J];交通世界(建养.机械);2011年09期
8 白山云;付克俭;李宗长;;超长预应力束初张力及持荷时间试验研究[J];桥梁建设;2009年03期
9 王鹏;楼普增;范厚彬;;悬臂浇筑施工中连续箱梁预应力管道摩阻测试研究[J];铁道建筑;2006年11期
10 郭梅;高墩大跨连续刚构桥稳定性分析[J];西安公路交通大学学报;1999年03期
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