Analysis On Serviceability Of Existing Long-Span PC Continuous Rigid Frame Bridges

With special characteristics and advantages, the long-span PC continuous rigid frame bridge have been widely used in bridge engineering. But there are many kinds of damages in the existing long-span PC continuous rigid frame bridge, which existed regularly and had negatively influences on the bridge serviceability. These damages include cracks in box girder, too large deflection in the middle span, the effective prestressing forces losing, and low quality in construction processes.This paper analyzed the serviceability of the long-span PC continuous rigid frame bridge based on the structural analysis and construction processes. The following main factors have been considered including structural characteristics, arrangement of prestressing tendons, concrete creep and shrinkage, temperature, construction process, calculating method of deflection, cracks in box girder, etc.Dongpu bridge located in Guangzhou was used as an sample in the paper to analyze the damage degree to the existing long-span continuous rigid frame bridge. Based on the results of analysis, some suggestions have been given for the serviceability control to the long-span continuous rigid frame bridge in design and construction processes.