Sensitivity Analysis of Factors Affecting down Deflection of Long-span Continuous Rigid Frame Bridge

Abstract

In order to deeply analyze the factors affecting the excessive mid-span deflection of the long-span continuous rigid frame bridge in service, this paper uses the Shaanxi A Bridge as the supporting project and uses the finite element analysis software Midas Civil to establish the bridge model. Put forward the factors that may affect the deflection, adopt a sensitivity analysis method that controls the value of a single factor while other factors remain unchanged, and repeatedly adjust the model parameters to obtain the deflection calculation results. According to the results, determine whether the factor is the main influencing factor of deflection. The research results show that structural stiffness, prestress loss, environmental temperature, and concrete shrinkage and creep are the main factors affecting the deflection of rigid frame bridges. The degree and direction of their influence on deflection are different. The research results can provide reference and guidance for actual engineering.