大跨度曲线连续刚构桥受力与变形分析

发布时间：2018-06-19 06:47

  本文选题：曲线梁桥 + 弯扭耦合　； 参考：《长沙理工大学》2014年硕士论文

【摘要】：随着我国城市化建设和交通基础建设的迅速发展,预应力混凝土曲线连续刚构桥得到了空前的发展。与直桥相比,就整条路线而言,曲线连续刚构桥行车舒适、线型流畅、造型美观、克服了直角接线,降低了拐弯处的交通事故,由此带来的社会整体效益是很大的。预应力混凝土曲线梁桥由于结构弯扭耦合的相互作用,使整个桥跨结构受力特性与变形特性呈复杂的空间特点,同时曲率半径对结构弯扭耦合程度影响很大。随着高速公路深入山区,高墩大跨度曲线连续刚构桥修建的越来越多,同时,此类桥型的研究在国内并不是很完善。因此,对高墩大跨度预应力混凝士曲线连续刚构桥的空间受力和变形特性研究具有十分重要的工程现实意义,有助于人们对曲线梁桥的空间特性更深入的了解,并为大跨度曲线梁桥的的设计与安全施工提供参考。首先：介绍了预应力混凝土曲线梁桥的研究背景、研究现状、求解的基本方法以及以往研究的不足。其次：建立了全桥MIDAS有限元模型,分析了自重、预应力荷载、恒荷载作用下大跨度曲线连续刚构桥的受力特点和变形特点,讨论了曲率半径对结构受力与变形的影响规律。分析了活荷载对大跨度曲线连续刚构桥运营阶段变形的影响,同时分析了活荷载作用下,曲率半径对桥跨结构变形的影响。最后：对本文研究的工作进行总结,得出了大跨度曲线连续刚构桥在自重、预应力、恒荷载、活荷载下的变形和内力变化规律,同时得出了曲率半径对曲线梁桥的影响规律。
[Abstract]:With the rapid development of urbanization and transportation infrastructure construction in China, the continuous rigid frame bridge of prestressed concrete curve has been developed unprecedentedly. Compared with the straight bridge, the curve continuous rigid frame bridge is comfortable, smooth and beautiful, and has overcome the right angle connection and reduced the traffic accidents at the turning corner. The overall benefit of the society is great. The prestressed concrete curved girder bridge, due to the interaction of the bending and torsion coupling of the structure, makes the whole bridge cross structure a complex spatial characteristic of the stress and deformation characteristics, and the curvature radius has a great influence on the bending and torsion coupling degree of the structure. With the expressway deep in the mountainous area, the high pier and large span curved continuous rigid frame bridge More and more construction is made, and the study of this type of bridge type is not perfect at home. Therefore, it is of great practical significance to study the spatial stress and deformation characteristics of the high pier and large span prestressed concrete curved continuous rigid frame bridge. It is helpful for people to know more deeply about the spatial characteristics of Qu Xianliang bridge and to be a large span. The design and safety construction of the curved girder bridge will provide reference. First, the research background of the prestressed concrete curved bridge is introduced, the research status, the basic method and the shortage of the previous research. Secondly, the finite element model of the full bridge MIDAS is established, and the self weight, the prestress load and the continuous stiffness of the long span curve under the constant load are analyzed. The influence of the curvature radius on the stress and deformation of the structure is discussed. The influence of the live load on the deformation of the long span curved continuous rigid frame bridge is analyzed, and the effect of the curvature radius on the deformation of the bridge structure is analyzed. Finally, the work of this paper is summarized. The law of deformation and internal force change of the long span curved continuous rigid frame bridge under the weight, prestress, constant load and live load is obtained, and the influence of curvature radius on the curved beam bridge is obtained.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.23
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本文编号：2038982