Analysis of precast box section of a bridge for different span lengths

In the present scenario, Minor bridges over small rivers have become necessary for the nation’s development to connect the country’s most remote corners. In this paper initially, 30 m of Minor Multi-cell Box type Bridge with different number of precast sections along with the different types of load such as Dead Load, Live Load, Super Imposed Dead Load, Earth pressure, and vehicle load such as Class “A” vehicle, 70R bogie vehicle, 70R Wheeled vehicle, 70R Tracked vehicle, as per IRC is analyzed. Also, various Load Combinations are applied to bridge structure such as limit state of collapse and limit state of serviceability, for accurate results of Bending Moment and Shear Force critical sections are marked. The aim and objective of the work are to analyze and design the different span lengths 3.43, 4, 4.8,6,8 m of box sections for the Indian Road Congress Code (i.e. IRC 6-2017 and IRC 112-2011). This has been done by analyzing the structure using software STADD PRO V8i. And design validating with manual results by developing the Microsoft Excel Sheet. From analysis and discussion, it is concluded that 5 sections of 4.8 m span which give better results and minimum cost compared to other section.

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