Study On Additional Longitudinal Force Of CWR On Continuous Beam

The laying of Continuous Welded Rail(CWR) on the bridge can effectively reduces interactive motive power between girder and rail, improves operating condition of Continuous Welded Rail on the bridge, decreases obviously workload of track maintenance and repair, and be benificial to extend service life of bridge and rail. So laying Continuous Welded Rail(CWR) on the bridge gradually becomes a major issues widely studied at home and abroad. However, CWR as a main technical difficulty in high-speed rail construction, the study of its solid calculation model and theoretical calculation method will necessairly go through aprocess in which they will be explored continuously and improved gradually. At present, the calculation of the additional longitudinal force of CWR on bridge is very tedious and is short of universal. Meanwhile, in our country, the most study about the additional longitudinal force of CWR on bridge is concerned with simple-supported girder bridge. About long- span continuous girder bridge, its particular structure and construction brings new research topic for CWR on bridge, and further demands the technique of CWR on bridge to develop towards a higher level.The thesis, which is based on integrating a large number of theoretical research and the results of the test at home and abroad, system atacially analyze current status of research and the calculation principle of additional longitudinal force of CWR on continuous girder bridges. Meanwhile, on the basis of considering comprehensively interre action and mutually bound between girder and rail and loading effects of trains, the thesis combines Finite Element theory to found Finite Element solid calculation model in three-dimensional space of integration among girder, rail, and pire. And the thesis use Finite Element method and Newton’s method to program additional longitudinal force’s Fortran language calculation program of CWR on continuous girder bridges. Meantime, the thesis combines actual working point to calculate and analyze different construction forms of continuous girder bridges, adopts different resistance models to research additional flexural stress, additional temperature stress, breaking joint and the rupture forces, and analyzes and compares to abtain the distribution of relevant additional force. These can provide references for engineering application. Main content:① According to the reasons produced by various additional longitudinal force of CWR bridge and the basic principle of interaction between girder and rail and basic differential equation, the thesis raises that using Finite Element method and Newton’s method analyze theoretically calculation of various additional longitudinal forces produced by CWR on continuous girder bridges.② On the basis of considering comprehensively interreaction and mutually bound between girder and rail and loading effects of trains, the thesis combines ANSYS to found non-linear Finite Element solid calculation method in three-dimensional space of integration among girder, rail, and pier.③ According to the basic principle of interaction between girder and rail and basic differential equation, the thesis use Finite Element method Newton’s method to program additional longitudinal force’s Fortran language calculation program, and mutually combines with calculation results of ANSYS and mutually verifies with calculation results of ANSYS, thus we can calculate systematacially flexural stress, temperature stress and rupture forces on each section points in the CWR. And we can further compare and analyze and abtain the distribution of relevant additional force, maximum additional longitudinal pressure force and maximum additional longitudinal pulling force produced by rail and the maximum displacement of girder and rail and then we can analyze the distribution of the most unfavorable load.④ The thesis researches additional longitudinal force of CWR on various section continuous girder bridges to construct respectively calculation models of CWR on continuous,continuous channel-girder, and continuous box-girder to compare and study additional longitudinal forces and come to a conclusion.⑤ Being concerned with the condition that the number of bridge spans are increasing gradually and that the length of continuous girder becomes gradually longer, the thesis deeply studies the problem whether the flexural stress and temperature stress produced by CWR on continuous girder bridge changed and what their change regulations are, and finally draw a conclusion.⑥ In the program calculation language, we will choose basic parameters according to two conditions: on the one hand, according to the original specification The Interim Provisions to the Design of CWR on the New Constructive Railway Bridges; on the other hand, according to The Design Specification of CWR in Rails, which was enacted lately in 2012. In the program calculation language, we will choose two parameters to calculate respectively longitudinal resistance forces, and compare and analyze the additional longitudinal force from the calculation.