Research On Adaptive Stress-Free Configuration Control Method Of Hybrid Beam Cable-Stayed Bridge

Because of the asymmetry of the main tower and the main girder,the construction of the asymmetric super long span hybrid girder cable-stayed bridge is more difficult and the structure is more complex.Taking the Jiujiang Yangtze River Highway Bridge as the engi-neering background,the adaptive stress free configuration control method of hybrid beam ca-ble-stayed bridge is studied in this paper,and the research has achieved the following results.(1)Based onVirtual work increment equation of Three-dimensional continuous defor-mation,increment equation of virtual work is proposed.On the basis of this,the finite element method is put forward under the coupling of nonlinear and shrinkage creep.According to the method of drag coordinate,an example is given to verify the theoretical calculation of the un-balance force,which verifies that the method is correct and accurate.(2)Through the optimization of Steel Box Girder Cantilever construction process,to ob-tain a quasi-optimized process,compared with the original assembly process,the stress state of the assembling process is good,but the frequency of the cable tension and adjustment of the whole process of the cantilever erection is less than that of post-assemblyprocess,and at the same time whichalso reduced beam section complete welding inspection time.(3)This paper expounds the principle of the single slit method by using the method of adaptive stress free configuration,and determines the length of the main beam installed at various temperatures by several temperature measurements,and calculated the length of sec-tion steel box beam in the design of closure temperature values.The calculated temperature of closure jacking force,to ensure the different temperature conditions could carry out the clo-sure construction according to construction process...