The Section Splicing And Error Analysis For Steel Box Girder In Unstressed State Control Method

The transfer matrix method is widely used in engineering practice for its clear and logical thinking, simple procedures, less storage and highly computational efficiency. Combined with the unstressed state method and transfer matrix method, the impact of spliced errors of the bridge segments on alignment and internal forces can be easily calculated in the beam bridge.Starting from the basic theory, the calculation principle of the transfer matrix method was described. Static determinate plane frame analysis program was compiled with MATLAB. Combined with engineering practice, according to the Pushing Construction Technology and Pushing Construction site monitoring, a program which can be used to computing simulation the Pushing Construction of Bridge was compiled with MATLAB and proved correct based on the transfer matrix method. Several key parameters were discussed in this thesis by the program of pushing construction in Shaoxing Binhai Bridge as engineering background. Thesis specific research work is as follows:The untressed state method and the research status of the steel box girder splice were introduced briefly.The development of the transfer matrix method and the research status of the transfer matrix method in the Pushing Construction of Bridge were introduced in this thesis.Based on the basic differential equations of beam element and nodal force equilibrium and displacement coordination, field transfer matrix and point matrix of one-dimensional beam elements and plane beam elements were derived. The basic idea for solving the transfer matrix was described, and calculation procedures which were verified by examples were programmed to solve continuous bridges and plane frame with MATLAB.In this thesis, the geometry relationship of each corner point of the steel box girder segment was derived; three forms of splicing errors of the section of the main beam were given. The transmission of displacement and coordinate of node during the construction process were analyzed in the transfer matrix method. Then the transfer matrix method was verified to calculate the unstressed splice angle error in the structure with examples of continuous beam and cantilever beam.The basic principles of Pushing Construction of Bridge and the type and function of the temporary structures of Pushing Construction of Bridge were described in this thesis. According to the basic principle of Walking Pushing Construction and practical experience, pushing process analysis procedures was compiled based on the transfer matrix method, and the basic assumptions and calculation principles of the procedure was discussed in detail.Taking Walking Pushing Construction of steel box girder of Shaoxing Binhai Bridge as the engineering background, the law of support reaction forces changes, main beam internal force and displacement of the front of the guide beams during pushing pier are summed up in this thesis. By changing the three parameters of the bearing stiffness, splice angle error between beam segment and support settlements during pushing pier, the impact of three parameters to the reaction forces changes and main beam internal force are analyzed.