桥台高度和桥梁跨径对肋板式桥台受力的影响
发布时间：2019-05-23 23:09
【摘要】：肋板式桥台是一种常见的桥台形式，在桥台高度较大时常被使用。通过对已经投入运营的肋板式桥台的调查表明，高度在8m以下的桥台运营状况良好，而台后填土高度大于8m的桥台，一些桥梁台帽跨中底部、台帽与肋板接触处的台帽顶面和承台底部出现了不同程度的开裂，破坏了桥台的整体性。高桥台病害，己经不是一个个别设计和施工那么简单的问题了，这必须引起的高度重视，这是目前公路桥梁设计修建过程中急需解决的技术问题之一。 本文在不同桥梁跨径、不同桥台高度和不同汽车荷载作用位置下，对钢筋混凝土肋板式桥台的顺桥向最大位移和桥台最大主拉应力进行了分析。本文结合工程实例，运用桥梁有限元软件Midas/Civil分别对40m跨径和50m跨径在汽车中载、偏载、人群荷载、温度荷载、混凝土收缩徐变作用下对桥梁上部结构进行受力分析，得出各支座的支反力。然后再运用桥梁有限元软件Midas/FEA分别在桥台高度为8m、10m、12m和14m下建立空间实体模型，，在上部结构所产生的支反力、土压力、汽车荷载、汽车制动力和汽车冲击力作用下分别对各模型进行计算分析，从而得到肋板式桥台顺桥向的最大位移和最大主拉应力随着各影响因素的变化规律。望本文所得出的结论对钢筋混凝土肋板式桥台的设计施工具有一定的参考价值。
[Abstract]:Ribbed plate bridge is a common form of bridge, which is often used in the height of bridge. Through the investigation of the ribbed plate bridge which has been put into operation, it is shown that the bridge with a height of less than 8m is in good condition, while when the backfill height is more than 8m, some bridge caps are at the middle and bottom of the span. The top surface of the cap and the bottom of the cap at the contact between the cap and the ribbed plate have cracked in varying degrees, which destroys the integrity of the bridge. The disease of high bridge deck is not a simple problem in individual design and construction, which must be attached great importance to, which is one of the technical problems that need to be solved urgently in the process of highway bridge design and construction at present. In this paper, the maximum bridge displacement and the maximum principal tensile stress of reinforced concrete ribbed slab bridge are analyzed under different bridge span, different bridge height and different vehicle load positions. In this paper, the bridge superstructure is analyzed under the action of 40m span, partial load, crowd load, temperature load and concrete shrinkage and creep by using the finite element software Midas/Civil of the bridge under the action of 40m span, partial load, crowd load, temperature load and concrete shrinkage and creep, respectively. The support force of each support is obtained. Then the bridge finite element software Midas/FEA is used to establish the spatial solid model at the height of 8m, 10m, 12m and 14m, respectively, and the support force, earth pressure and automobile load produced by the superstructure are established. Under the action of automobile braking force and automobile impact force, each model is calculated and analyzed respectively, and the maximum displacement and maximum principal tensile stress of ribbed deck along the bridge direction are obtained. It is hoped that the conclusions obtained in this paper have certain reference value for the design and construction of reinforced concrete ribbed slab bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.21
本文编号：2484320
[Abstract]:Ribbed plate bridge is a common form of bridge, which is often used in the height of bridge. Through the investigation of the ribbed plate bridge which has been put into operation, it is shown that the bridge with a height of less than 8m is in good condition, while when the backfill height is more than 8m, some bridge caps are at the middle and bottom of the span. The top surface of the cap and the bottom of the cap at the contact between the cap and the ribbed plate have cracked in varying degrees, which destroys the integrity of the bridge. The disease of high bridge deck is not a simple problem in individual design and construction, which must be attached great importance to, which is one of the technical problems that need to be solved urgently in the process of highway bridge design and construction at present. In this paper, the maximum bridge displacement and the maximum principal tensile stress of reinforced concrete ribbed slab bridge are analyzed under different bridge span, different bridge height and different vehicle load positions. In this paper, the bridge superstructure is analyzed under the action of 40m span, partial load, crowd load, temperature load and concrete shrinkage and creep by using the finite element software Midas/Civil of the bridge under the action of 40m span, partial load, crowd load, temperature load and concrete shrinkage and creep, respectively. The support force of each support is obtained. Then the bridge finite element software Midas/FEA is used to establish the spatial solid model at the height of 8m, 10m, 12m and 14m, respectively, and the support force, earth pressure and automobile load produced by the superstructure are established. Under the action of automobile braking force and automobile impact force, each model is calculated and analyzed respectively, and the maximum displacement and maximum principal tensile stress of ribbed deck along the bridge direction are obtained. It is hoped that the conclusions obtained in this paper have certain reference value for the design and construction of reinforced concrete ribbed slab bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.21
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