Dynamic analysis of a coupled steel-concrete composite box girder bridge-train system considering slip and shear-lag

摘要

A model considering slip and shear-lag for the dynamic analysis of a coupled steel-concrete composite bridge-train system is proposed in this paper, based on the finite element method and Euler-Bernoulli theory. The stiffness matrix, damping matrix, mass matrix, wheel-rail contact force matrix and the equations of motion of the coupled system considering slip and shear-lag are derived based on energy theory. In addition, a solver for dynamic analysis of the coupled system considering slip and shear-lag is compiled by using the Newmark-beta method. To verify the rationality of the dynamic analysis model, field-test data for this type of coupled system from literature is compared with the data calculated by the improved model, and good agreement is found. The influence of slip and shear-lag on the dynamic response of the coupled system is studied in detail through a case study. The analysis proves that these factors (slip and shear-lag) substantially affect the dynamic response of the coupled system. This model proposed in this paper provides an efficient tool to analyze of the influence of slip and shear-lag on the dynamic response of coupled steel-concrete composite bridge-train systems.