Abstract
Abstract: Bridge is the structure that provide passage over an obstacle. The prestressed concrete bridges have excellent riding characteristics that minimize traffic vibrations, torsional rigidity, less likely to crack prematurely continuous span, strength and the most noteworthy characteristic is natural frequency of vibration hardly matches with vehicle frequency therefore attained spacious acceptance in freeway, highway flyovers, and in modern metro rail systems. As bridges are the important structures should be capable to withstand static as well as dynamic loads specially, earthquakeinduced load to achieve a structure that behave at the level of life safety under enormous earthquakes. There are different types of bridge structure base on material & geometric parameters, from which prestress concrete precast I girder bridge and box girder bridge are widely used for medium to long span rang. Box girder bridge are the bridge where the main beam consists of girder in hollow shape, where as in I girder bridge main beam consist of I-shape girder are used as main girder beam.
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