Comparative Study On Seismic Performance And Dynamic Analysis Of Elevated Water Tanks In Seismic Zone Iii Under Varying Soil Conditions Using Staad.Prov8i.
DOI:
https://doi.org/10.64882/ijrt.v14.i3.1625Keywords:
Intze-type elevated water tank, Seismic analysis, Soil-Structure Interaction (SSI), Winkler Spring Model, STAAD.PROV8i, Seismic Zone III, Structural resilienceAbstract
This paper presents a structural analysis and design optimization of an 80 KL Elevated Over Head Service Reservoir (OHSR) with a 14 m staging height, focusing on Soil-Structure Interaction (SSI) under seismic and hydrodynamic loads. Conventional designs assume a rigid, fixed-base condition, which often miscalculates dynamic responses. To address this, a comparative evaluation was conducted using STAAD.ProV8i to model both fixed-base and flexible-base (SSI-inclusive) parameters. Structural evaluations of hydrostatic and hydrodynamic forces were performed per IS 3370:2021 and IS 1893:2016. Serviceability limit states were strictly validated. The foundation, consisting of isolated pad footings, was optimized to a 450 mm thickness with ø 12 @ 140/150 mm c/c reinforcement. The calculated crack width (Wcr) was restricted to 0.02 mm, well within the 0.2 mm limit of IS 456:2000. Results show that fixed-base models underestimate structural displacement, whereas SSI-inclusive analysis provides a realistic, resilient response. The findings highlight that accounting for SSI and crack-width optimization is vital for the durability and integrity of water tanks in seismic zones.
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