Analysis Of Simulation Calculation On The Construction Process Of Long-span CFST Arch Bridge

The construction of concrete filled steel-tube (CFST) arch bridge with long span is always divided into many working procedures, which are completed step by step. The construction process is long and complex. So, the simulation analysis on the construction of long span CFST arch bridge is essential. Based on the research subject of "Research on the Key Technique for Construction Control of Long-span CFST Arch Bridge" funded by Hubei communication department and Jingyan River Bridge in Hubei province, this paper studied on the analysis of simulation calculation on the steel-tube-rib-hoisting process and the entire process of pumping liquid concrete in the steel-tube.1. The technique of "birth and death element" is applied to the analysis of simulation on the construction process of CFST arch bridge, which makes modeling job very simple in orderly-erecting and inversely-erecting analysis, and data transferring very easy between them. What's more, the order flows about the simulation analysis is programmed based on ANSYS software, which makes simulation analysis rule and simple.2. The most optimizing theory is introduced to the calculation of the stayed-buckle-cable forces in the process of segment hosting construction of the steel-tube arch. Based on the space finite element calculation of the structure, the best optimum cable forces are got by setting up objective function, design variable and state variable. Comparing with the result of conventional method and the test, it can be seen that the calculated optimum cable forces with high precision not only guarantee the inner forces and the structure distortion in safe state, but also ensure the line shape of the arch according with design objective.3. Based on the real construction craft and pumping order, simulate and study on the entire process of pumping liquid concrete in the steel-tube to find the state of the stress and deformation of the structure. By using the geometrical nonlinearity theory and material nonlinearity theory, the stability of long span CFST arch bridge has been studied in this paper. The results indicate the in-plane stiffness of the bridge structure is far greater than the out-plane stiffness. The stability coefficients of every construction step of pumping liquid concrete in the steel-tube are all larger than 10, which prove the possibility of wholly losing-stability is very small. The influence of geometrical nonlinearity is small. Considering the geometrical nonlinearity, the coefficient of stability will decrease approximate 10% of the elastic stability coefficient. The influence of material nonlinearity is evident. Considering the geometrical nonlinearity and material nonlinearity at the same time, the stability coefficient is approximate 40% of the elastic stability coefficient. So, for stability analysis of the long span CFST arch bridge, the influence of geometrical nonlinearity and material nonlinearity must be considered at the same time.