公轨复合交通部分斜拉桥合理受力体系研究

发布时间：2018-03-18 09:09

本文选题：索辅梁桥　切入点：敏感性参数　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：索辅梁桥是一种新兴的斜拉桥结构类型，这类桥梁结合了常规斜拉桥和梁桥的结构优点，并在其优点的基础上充分发挥自身优势，使得该类桥梁的应用前景变得愈来愈广阔。就其结构形式而言，主梁高度较大，索塔较高，拉索相对较多；就其结构受力特性而言，由于主梁高度较大，主梁承担很大一部分的内力，拉索作为辅助承重结构体系，也要承受很大的拉力。当该类桥型不再是单一用途，而是公轨两用时，主梁的高度就要增大，相应的主梁的刚度增大，具有较大的抗弯、抗扭能力，并且需要拉索将主梁的刚度进一步增强，因此，该类桥型能够将拉索和主梁有效的结合起来，使得此类桥的跨度更大，结构受力更加合理。本篇文章选取重庆市东水门长江大桥为依托项目，通过对其较为详尽的理论分析研究，得出该桥各项理论计算值；在此基础上，通过对其进一步的研究分析，最终得出该桥桥梁各项参数较为合理的设计值，用以支持该类桥梁的设计施工。东水门大桥主桥的用途为公轨两用，索面为单索面，因此在公路和轨道交通荷载作用下，对该类斜拉桥结构提出了更高的要求，结合该桥的结构特点，，从桥梁的各个结构参数出发研究其对桥梁合理受力体系的影响，通过对结构设计参数的研究分析，最终提取合理的结构设计参数。本文着重研究的参数主要有：主梁高度和主梁跨径之比、主塔高度和主梁跨径之比、无索区长度以及主梁与索塔的刚度之比等。从而总结出东水门长江大桥整体结构的受力特性与合理受力体系，为同类型桥梁的设计提供一定参考。本文选取的结构受力指标为主梁跨中正弯矩的最值、塔根支座处负弯矩的最值、主梁跨中的竖向挠度以及索塔底部的弯矩，这些内力指标对结构设计参数调整是非常敏感的，因此这类指标在结构分析研究的过程中必须加以进行必要的考虑。由于在总结分析过程中，指标的数据比较庞大，其内力及位移的单位也不尽相同，因此为使研究方便，本文选取的受力指标均转换为无量纲指标，通过对这些无量纲指标的研究分析，从而得出索辅梁桥的合理受力体系。
[Abstract]:Cable-assisted girder bridge is a new type of cable-stayed bridge, which combines the structural advantages of conventional cable-stayed bridge and beam bridge, and gives full play to its own advantages on the basis of its advantages. The application prospect of this kind of bridge becomes wider and wider. In terms of its structural form, the height of the main girder is larger, the cable tower is higher, the cable is relatively more, and in terms of the structural characteristics of the bridge, the height of the main beam is larger. The girder bears a large part of the internal force, and the cable, as an auxiliary load-bearing structure system, also has to bear a great amount of tension. When this type of bridge is no longer a single purpose, but a common rail, the height of the main beam will increase. The stiffness of the corresponding main beam is increased, which has the ability to resist bending and torsion, and the stiffness of the main beam needs to be further strengthened by the cable. Therefore, this kind of bridge type can effectively combine the cable with the main beam, and make the span of this kind of bridge larger. The force on the structure is more reasonable. This article selects the Dongshuimen Yangtze River Bridge in Chongqing as the project, through the detailed theoretical analysis and research, obtains the bridge each theoretical calculation value, on this basis, through the further research analysis, Finally, the reasonable design value of the bridge parameters is obtained to support the design and construction of this kind of bridge. The main bridge of Dongshuimen Bridge is used for both common rail and single cable plane, so under the action of highway and rail traffic load, Higher requirements are put forward for this kind of cable-stayed bridge structure. According to the structural characteristics of the bridge, the influence of each structural parameter of the bridge on the reasonable stress system of the bridge is studied, and the structural design parameters are studied and analyzed. The main parameters studied in this paper are the ratio of the height of the main beam to the span of the main beam, the ratio of the height of the main tower to the span of the main beam, the ratio of the height of the main tower to the span of the main beam. The length of the cable free zone and the ratio of the stiffness of the main girder to the cable tower are summarized. The stress characteristics and reasonable stress system of the whole structure of the Dongshuimen Yangtze River Bridge are summarized, which provides a certain reference for the design of the same type of bridge. The structural force index selected in this paper is the maximum value of the positive moment in the span of the main beam, the maximum value of the negative moment at the root support of the tower, the vertical deflection in the span of the main beam and the bending moment at the bottom of the cable tower. These internal force indexes are very sensitive to the adjustment of the structural design parameters. Therefore, the necessary consideration must be given to this kind of index in the process of structural analysis and research. Because the data of the index is quite large in the process of summing up and analyzing, the units of internal force and displacement are different, so it is convenient to study. The force indexes selected in this paper are all converted into dimensionless indexes. Through the research and analysis of these dimensionless indexes, the reasonable force system of cable-assisted girder bridges is obtained.
【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】：U448.27

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