Local Stress Analysis on Cable Tower of Single Tower and Double Cable Plane Cable-stayed Bridge Based on Submodel Method

The main bridge of the Gandong Bridge in Fuzhou is a irregular shaped cable-stayed bridge with a single pylon and double cable planes. The stress of interchanges of pylons of anchorage zone of the cable-stayed bridge is rather complicated. In order to investigate the mechanical characteristics of the complex structure area for single tower and double cable plane cable-stayed bridge,full scale structural model is simulated by MIDAS Civil software. After analyzed different load states,the most unfavorable stress state is selected. Submodeling method is used to refined finite element model of the bridge tower, and different parts of bridge tower are analyzed. The results indicate that the interchanges of pylons of anchorage zone can generally meet the stress requirement but the stress concentration is relatively severe and special attention is suggested to pay to design. Some reinforcement should be added at the area of stress concentration and make sure the local structure design is safe and rational. The results can be referenced to design and construction,which would have significance for design reference of similar bridge in a certain degree.