Analysis on drop of arch axis of a concrete-filled steel tubular arch bridge in north China

Aimed at the problem of a concrete-filled steel tubular (CFST) arch bridge in north China which the jointing heights of east and west arch rib is 0.30 and 0.44 meters lower than the design elevation, respectively, the software ANSYS is adopted to establish the finite element model of the structure and used to analyze the structural internal force under live load. Based on the contrastive analysis of the bridge, some major conclusions are summarized as follows: There is a little influence on support reaction and deflection, axial force, moment, stress of every reference sections owing to the drop of arch axis, and it is ignorable. By analyzing the drop of arch axis of the bridge, the influences of arch axis dropping on the structure are found, and the bridge is considered to be safe. The results obtained are available to the detection and evaluation of the structure in practice.