橋墩沉降對輕軌軌道平順度影響的研究.pdf

1、華中科技大學(xué)碩士學(xué)位論文橋墩沉降對輕軌軌道平順度影響的研究姓名：汪建平申請學(xué)位級別：碩士專業(yè)：系統(tǒng)分析與集成指導(dǎo)教師：王乘2011-02-27華 中 科 技 大 學(xué) 碩 士 學(xué) 位 論 文 華 中 科 技 大 學(xué) 碩 士 學(xué) 位 論 文 IIAbstract Light rail transit as a basilic component of urban traffic, the safety of its operations

2、is extremely important. Subject to restrictions on urban land, inevitably there will be underground works through the existing situation in transportation planning. Near the piers, rock excavation would make the pier sin

3、king, which led track irregularity to exceed the limit, then endangers the traffic. Therefore, a finite element model was created to analysis the changes of track irregularity which the settlements of the piers caused. T

4、he main research contents are as follows: 1. Studied the light-rail bridge and rail line features, a three-dimensional finite element model of ABAQUS was established for the settlement problem. In the ABAQUS model, the c

5、oncrete-reinforcement separate method was used to model the concrete bridge, in which the concrete, reinforcement, prestressed reinforcement elements would be established separately. Linear Spring was used to simulate th

6、e functions of rail fastener and support in the bridge-rail system. The model of railway bridge can act as a follow-up general model for the settlement question of the railway bridge. 2. On a two-span bridge model，the ch

7、anges of track irregularity was analyzed under five different boundary conditions. Moreover, the impact of concrete strength, Reinforcement ratio, Prestress and Fastener stiffness on the track irregularity was also studi

8、ed under the boundary condition of UY. The law of changes of the track irregularity which the five different boundary conditions cause was proposed. 3. In order to solve the problems encountered during the construction a

9、t the Xunlimen Station in Wuhan, this paper mainly presents the impact of three combinations of multiple-displacement boundary conditions on the track irregularity. At the same time, the value and type of the displacemen