Space Structure Analysis Of Oblique And Curved Bridge

The beam grid analysis method is more practical and more effective than others in space structure which uses computer means to analyze top structure of bridge. Because it has the feature that its basic conception is legible and is easy to understand and to use, used widely in bridge structure analysis. The method simulates the structure with equivalent beam grid that is easy for the analysis of computer, and by the analysis of the equivalent beam grid the mechanical characteristics and internal stress can be obtained. The main way of the method of beam grid is to simulate the top structure with a equivalent beam grid, and concentrates the scattered bending rigid and tension rigid in slab or box beam into the close equivalent beam grid, and the longitudinal rigid of the real structure is concentrated in longitudinal beam rigid, and the lateral rigid is concentrated in lateral beam rigid.The thesis probes into space structure of oblique and curved bridge with beam grid method. It is discussed in the thesis about mechanics capability of top structure of oblique and curved bridge and how to divide grid and calculate its section attribution of shell, beam-shell, box beam's top structure, and calculates the total effect of pre-stressed bunch, considering all kinds of the lost of pre-stress. In the course of analysis, as a new attempt, the thesis uses MATLAB language to carry out finite element method of beam grid structure and calculate space pre-stress force. Because of the powerful function of matrix's calculation, the procedure utilizes normal signs and functions to plus, subtract, multiply, divide, transpose and inverse matrix, and can handle special matrix such as the sparse matrix, and is suitable for the programming of the large-scale numerical algorithm of finite element. So it advances efficiency of programming and precise of result extremely.