重庆涪陵乌江大桥支座受力分析及辅助墩优化设计
发布时间：2018-08-31 17:16
【摘要】：虽然支座在桥梁建设的造价中所占比例很小,但是其重要性不言而喻。支座分为固定支座、单向活动支座及双向活动,支座重庆涪陵乌江大桥支座由过渡墩支座、辅助墩支座及主墩支座组成。支座反力大小由恒载、活载以及温度等其它附加因素决定。斜拉桥合理成桥状态有一组最优索力使主梁、主塔受力最佳,与之相对应的成桥状态支座反力共同平衡主梁重量,同时考虑支座反力影响线在最不利汽车活载作用下求出的反力最大值,加上温度、墩身沉降等因素最不利条件下的支座反力变化值,按照效应的标准值组合确定支座反力的设计值,并兼顾支座纵向位移值、横向位移值,从而进行支座的设计。本文对支座的受力以及辅助墩对斜拉桥受力性能的影响进行分析,以重庆涪陵乌江大桥为研究背景,主要工作内容如下：1)本文用分步算法确定重庆涪陵乌江大桥的合理成桥状态,研究合理成桥状态下以及活载作用下的支座受力,综合温度、支座沉降等附加因素造成的支座反力变化,按照效应的标准值组合确定支座反力的设计值,为以后支座的选用提供参考。2)阐述混凝土的温度效应理论,利用有限元分析软件Midas\Civil计算了温度效应(体系温差、索梁温差、索塔温差、温度梯度、支座安装温度以及合龙温度)对重庆涪丰石高速乌江大桥支座受力及纵桥向位移的影响,分析了影响乌江大桥拉压支座受力的最不利温度荷载组合,并对影响辅助墩、过渡墩支座受力大小的温度荷载进行排序,针对支座安装以及合龙温度提出了相关建议；3)分析混凝土容重、索力误差、活载、二期恒载、墩身沉降等因素对乌江大桥拉压支座的受力影响,并对过渡墩、辅助墩上压重横梁进行优化设计,确保支座处于合理的受力状态,针对支座受力及支座处主梁纵向位移寻找出其中规律并提出相关建议；4)探讨辅助墩对斜拉桥主梁应力、主梁竖向变形、索塔弯矩和拉索应力的影响,对辅助墩合理数量进行研究,通过比较不同的方案分析辅助墩的最优位置,得出相关结论,为今后斜拉桥辅助墩的设计、分析提供参考。
[Abstract]:Although the support in the cost of bridge construction accounts for a small proportion, but its importance is self-evident. The support is divided into fixed support, one-way active support and bidirectional support. The support of Fuling Wujiang Bridge in Chongqing consists of transitional pier support, auxiliary pier support and main pier support. The support reaction force is determined by other additional factors such as dead load, live load and temperature. There is a group of optimal cable forces to make the main girder and the main tower bear the best force in the reasonable state of the cable-stayed bridge. The corresponding state of the bridge supports counterforce balance the weight of the main beam together. At the same time, considering the maximum value of the reaction force under the most disadvantageous vehicle live load, the change value of the bearing reaction force under the most unfavorable conditions, such as temperature, pier settlement and so on, is taken into account. According to the standard value combination of the effect, the design value of the support reaction force is determined, and the support longitudinal displacement value and the transverse displacement value are taken into account in order to carry out the design of the support. This paper analyzes the bearing force and the influence of auxiliary piers on the mechanical performance of cable-stayed bridge, taking the Fuling Wujiang Bridge in Chongqing as the research background. The main work of this paper is as follows: (1) in this paper, we use the stepwise algorithm to determine the reasonable completion state of the Fuling Wujiang Bridge in Chongqing, and study the bearing force and the comprehensive temperature under the reasonable completion state and the live load. According to the standard value combination of the effect, the design value of the bearing reaction force is determined, which can provide reference for the later selection of the bearing. (2) the theory of temperature effect of concrete is expounded. The influence of temperature effect (system temperature difference, cable beam temperature difference, cable tower temperature difference, temperature gradient, support installation temperature and closure temperature) on the bearing force and longitudinal displacement of Wujiang Bridge at Fufeng High Speed in Chongqing is calculated by using the finite element analysis software Midas\ Civil. This paper analyzes the most unfavorable temperature load combination which affects the bearing force of the tension and compression bearing of Wujiang Bridge, and sorts the temperature load that affects the bearing size of the auxiliary pier and the transition pier, and puts forward some relevant suggestions for the installation of the bearing and the closing temperature. 3) analyzing the influence of concrete bulk density, cable force error, live load, second stage dead load, pier settlement and other factors on the tension and compression bearing of Wujiang Bridge, and optimizing the design of the transition pier and the compression beam on the auxiliary pier. To ensure that the bearing is in a reasonable state of stress, to find out the law of the bearing force and the longitudinal displacement of the main beam at the support, and to put forward some relevant suggestions (4) to probe into the stress and vertical deformation of the main beam of the auxiliary pier to the cable-stayed bridge, The influence of cable tower bending moment and cable stress on the reasonable number of auxiliary piers is studied. The optimum position of auxiliary piers is analyzed by comparing different schemes and relevant conclusions are drawn which can provide a reference for the design and analysis of auxiliary piers of cable-stayed bridges in the future.
【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】：U448.27
，
本文编号：2215642
[Abstract]:Although the support in the cost of bridge construction accounts for a small proportion, but its importance is self-evident. The support is divided into fixed support, one-way active support and bidirectional support. The support of Fuling Wujiang Bridge in Chongqing consists of transitional pier support, auxiliary pier support and main pier support. The support reaction force is determined by other additional factors such as dead load, live load and temperature. There is a group of optimal cable forces to make the main girder and the main tower bear the best force in the reasonable state of the cable-stayed bridge. The corresponding state of the bridge supports counterforce balance the weight of the main beam together. At the same time, considering the maximum value of the reaction force under the most disadvantageous vehicle live load, the change value of the bearing reaction force under the most unfavorable conditions, such as temperature, pier settlement and so on, is taken into account. According to the standard value combination of the effect, the design value of the support reaction force is determined, and the support longitudinal displacement value and the transverse displacement value are taken into account in order to carry out the design of the support. This paper analyzes the bearing force and the influence of auxiliary piers on the mechanical performance of cable-stayed bridge, taking the Fuling Wujiang Bridge in Chongqing as the research background. The main work of this paper is as follows: (1) in this paper, we use the stepwise algorithm to determine the reasonable completion state of the Fuling Wujiang Bridge in Chongqing, and study the bearing force and the comprehensive temperature under the reasonable completion state and the live load. According to the standard value combination of the effect, the design value of the bearing reaction force is determined, which can provide reference for the later selection of the bearing. (2) the theory of temperature effect of concrete is expounded. The influence of temperature effect (system temperature difference, cable beam temperature difference, cable tower temperature difference, temperature gradient, support installation temperature and closure temperature) on the bearing force and longitudinal displacement of Wujiang Bridge at Fufeng High Speed in Chongqing is calculated by using the finite element analysis software Midas\ Civil. This paper analyzes the most unfavorable temperature load combination which affects the bearing force of the tension and compression bearing of Wujiang Bridge, and sorts the temperature load that affects the bearing size of the auxiliary pier and the transition pier, and puts forward some relevant suggestions for the installation of the bearing and the closing temperature. 3) analyzing the influence of concrete bulk density, cable force error, live load, second stage dead load, pier settlement and other factors on the tension and compression bearing of Wujiang Bridge, and optimizing the design of the transition pier and the compression beam on the auxiliary pier. To ensure that the bearing is in a reasonable state of stress, to find out the law of the bearing force and the longitudinal displacement of the main beam at the support, and to put forward some relevant suggestions (4) to probe into the stress and vertical deformation of the main beam of the auxiliary pier to the cable-stayed bridge, The influence of cable tower bending moment and cable stress on the reasonable number of auxiliary piers is studied. The optimum position of auxiliary piers is analyzed by comparing different schemes and relevant conclusions are drawn which can provide a reference for the design and analysis of auxiliary piers of cable-stayed bridges in the future.
【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】：U448.27
，
本文编号：2215642
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