Retrofitting and Rehabilitation of Existing Elevated Water Tank

Elevated water tanks are one of the most important lifeline structures in earthquake prone regions. In major cities and also in rural areas elevated water tanks forms an integral part of water supply scheme. These structures has large mass concentrated at the top of slender supporting structure hence these structures are especially vulnerable to horizontal forces due to earthquake. Analysis is done according to IS 1893 Part I & II, Wind analysis is done according to IS 875-1987 (Part III) & IS 875 draft (Part III). In this paper ESR of staging height 12m is considered with capacity varying from 20 m3 to 100 m3. Analysis has been done using SAP-2000.The Rehabilitation of the existing damaged Elevated storage reservoir with pile foundation is used in this work to evaluate the effectiveness of retrofitting techniques, called Concrete Jacketing. Economic aspects are studied for different innovative water tanks staging systems with reference to conventional frame type and shaft type staging of ESR.Reinforced concrete elevated water tanks are critical structures that are expected to remain functional after severe earthquake in order to serve water system network. During earthquake activity the liquid exerts impulsive and convective pressures (sloshing) on the walls and bottom of tank.