Analysis and Design of Spine and Wing Type PSC-Box Girder

Abstract

In recent times, the use of PSC-Box Girder bridges has increased due to the possibility of longer span ranges. To increase the transverse length for wider sections struts or transverse ribs are provided to support large cantilevers. These large cantilevers provide space to accommodate for wider carriageway width, which intern allows ease in the flow of dense traffic. These bridges have significantly higher transverse stiffness and efficiency to resist moments caused by vertical loads acting at the root of the cantilever. Due to the increased benefit in economic, aesthetic and structural aspects of the spine and rib type PSC-box girders, it is preferred by both architects and structural engineers. However, due to a lack of research, there is limited information available for analysis and design. A real-time problem of a bridge was taken where spine and rib type of bridge is proposed to be designed. This work is carried out as per Indian Road Congress specifications. Span by Span construction method was adopted for its benefits. The Whole cross-section was divided into three segments. One segment of central spine and two segments of wing placed on either side of spine segment. For the analysis of spine and wing type PSC-box girder MIDAS Civil was used for its ease in modelling and analysis of static load, moving load and pre-stressing forces. In the study presented the design of spine and wing type PSC box girder is carried out. Whereas for transverse analysis of girder STAAD Pro was used. The cost analysis of the bridge has been carried out after estimating the superstructure.