ANALYSIS AND DESIGN OF PRESTRESSED CONCRETE BRIDGES SUBJECTED TO DYNAMIC LOADS- A REVIEW

Abstract

Due to efficient dissemination of congested traffic, economic considerations, and aesthetic desirability
horizontally box girder bridges have become increasingly popular nowadays in modern highway systems, including
urban interchanges. A general description of the finite element approach is presented using the finite element
program SAP 2000N and STAAD PRO that was utilized. The prestressed concrete box girder bridge superstructure
analysed in the base case consists of box girders with varying span. The superstructure is loaded by different IRC
class like 70 R loads and the loads are incremented until the bridge superstructure system fails. A sensitivity analysis
is performed to study how variations in the bridge geometry, damage scenarios, member properties and bridge
continuity affect the redundancy of the superstructure. The results are presented in the form of prestressing force,
moment, shear and deflection. The deflected shape of the bridge model shows that there is a marginal increase in the
value of deflection according to the various loading and increased different various time period intervals too. A
comparative study was carried out between I girder and Box girder. By extracting result it has been concluded that
box girder is costlier than I girder. It has also seen that losses is more in I girder as compared to Box girder. The
analysis and design of Box girder bridges for any span can be obtained from the mathematical models without doing
lengthy calculations.