PARAMETRIC STUDY OF COMPOSITE PLATE GIRDER ROAD BRIDGE

Mechanics

Design of structural members with maximum efficiency and minimum cost has always been a challenge for engineers. Steel concrete composite construction has become increasingly popular in advanced countries and is also fast catching up in developing countries. Steel concrete composite construction is an ideal example wherein there is most effective utilization of materials i.e. compression capacity of concrete and tensile capacity of steel. In this paper, analysis and design of composite plate girder for four-lane Highway Bridge is considered. The bridge consists of reinforced concrete deck and steel girders. In steel concrete composite bridge, various alternatives have been considered for analysis and design. The alternatives consist of variation in span, span to depth ratio and designs as per IS 800:1984, by which superstructure design is mainly affected. Analysis is carried out using MIDAS civil software for various vehicular load combination specified in IRC-22. A total 15 alternatives were taken considering spans of 15m, 20m, and 25m with various span to depth ratios. Parametric study was done for calculation of most economical L/D ratio for above mentioned spans. For all the alternatives, cost estimation was carried out with prevailing market rates. From this study, it was found that most economical L/D ratio with minimum cost was 9.9, 13.08 & 13.34 for span of 15m, 20m & 25m respectively. Hence this work provides a direct & simple method for optimal economical design of steel concrete composite road bridge superstructure.

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