Analysis of Mechanical Performance of Tied Arch Bridge with Multiple Arch Ribs

The main bridge of Yiqian Bridge is a 2×83mtied arch bridge with three arch ribs.To verify the safety of the structural design of the bridge,the MIDAS Civil was used to build the beam element model of the bridge to analyze the static performance of the full bridge and the ANSYS was used to build the solid element model of the arch springings to analyze the local stress of the arch springings.The results of the calculation showed that the key nodes of the hangers had displacement in longitudinal and transverse directions of the bridge as well as the vertical direction,the mechanical behavior of the bridge showed the feature of spatial effect and it would be quite necessary to taking into account the displacement in three directions in the construction and monitoring of the bridge,so as to prevent the offsetting of the hangers.Pre-offset should be set for the bearings to prevent the occurrence of shear failure of the bearings.The local stress in the full bridge and the nodes of the arch springings could meet the code requirements,and the structure was safe.