Continuous Girder Bridge Luanching Construction Procedure Design And Carrying Capability Optimization Research

The paperutilize the 6×90m Steel racks beam incremental launching construction of Hankou side in Wuhan erqi Yangtze river bridge as the Engineering Background. In the paper, the whole simulated calculation program of continuous girder bridge incremental launching is formed while centreing on the mechanical characteristics during the process of launching construction in the continuous curved bridge of vertical curve with changing curvature , as well as the needs of the actual construction monitoring. The local stress analysis of the cantilever root is performed detailedly, which can not be reflected by the whole simulated program. Besides, the different handing methods of the conditions in local boundary are also compared. To ensure the steal beam bridge is launching favoring, the top slide elevation on temporary piers is simulated and optimized, and to confirm the power transmission path of the main steel girders section by introducing the topology optimization method is put forward. The main research contents are as follows:(1)The analytic method of incremental launching construction in the continuous curved bridge of vertical curve with changing curvature , using the force theory, is discussed.(2)According to the needs of actual construction, the calculator program, which fast and accurately simulates the overall process of pushing construction of the steel beam bridge and includes the APDL language of ANSYS and C language programming, is preliminary compiled. In addition, the reliability of the programme is tested by the calculated results of midas2006 and the test programme of the real bridge in the paper.(3)Considering the inhomogeneity of distribution of reaction force and the impact of support place corner displacement on steel tank beam, local stress analysis is performed under the condition of maximum cantilever, and the different handing methods of local boundary conditions is discussed as well.(4)On the basis of pushing simulation calculation, with a view to exceeding standard on carrying capability of the launching nose and temporary pier, prioritization proposel on temporary piers and slideway elevation, which is confirmed by the APDL language of ANSYS and C language programming compiled in this paper, is proposed.(5)As there are disadvantages in the design of steel bridge by incremental launching construction, introducing the topology optimization is the way to confirm the power transmission path of the main steel girders sections, which provides reference for the design of the same kind.