POST-TENSIONED HIGHWAY BRIDGE'S SUPERSTRUCTURE IN RELATION TO THE SPAN TO DEPTH RATIO

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Mr Sukant Verma1, Mr Akshit Lamba2

Vol 18, No 3 ( 2023 )   |  Licensing: CC 4.0   |   Pg no: 109-116   |   Published on: 30-03-2023

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Abstract
The slenderness ratio, or span-to-depth ratio, is a crucial design parameter for bridges that has an impact on structural behavior, construction costs, and aesthetics. According to a study of 86 constant-depth girders, conventional ratios have not changed much since 1958. Because recently developed high-strength concrete has improved mechanical properties that permit for thinner sections, these conventional ratios are now in question.[6,7] The paper finds the best ratios for a high-strength concrete 7-span highway viaduct by comparing material consumption, cost, and aesthetics. Two kinds of bridges are looked into: cast-in-situ solid slabs are cast on a false work box-girder. The results show that the span-to-depth ratio has little effect on total construction costs in the following ratio ranges:10-35 and 30-45, respectively, for the two types of bridges. As a result of this finding, higher ranges of ratios can now be selected without significant cost premiums, compared to conventional values (i.e., 18-23 and 22-39). This gives aesthetic expressions more freedom.[8,9]

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