Analysis of Spatial Mechanical Properties of an Irregular-Shape Tied Arch Bridge

To study the spatial mechanical properties of irregular-shape tied arch bridges with inclined hangers,a tied arch bridge of the same type was taken as the research object,the MIDAS Civil was used to set up the spatial finite element model for the bridge,the static,dynamic properties and structural stability of the bridge at construction and service stages were analyzed.The results of the analysis indicate that the impact of additional stress of the inclined hangers on the arch ribs is great.The global rigidity of the stringer and cross beam frame system of the whole bridge is considerable.The deflection of the arch ribs is sensitive to temperature fall.The stress amplitude of the hangers at service stage is uniform and is about 50 MPa.The lateral inclination rigidity of the arch ribs is little,the contribution of the rigidity of the arch ribs to the rigidity of the whole bridge is great and the stability factors of various stages are high.The adjustment of the hanger cables has considerable impact on the stress levels of the whole bridge,to which attention should be paid in the process of construction.