Comparative Seismic Analysis Between Elevated Circular Water Tanks Using Equivalent Static Method and Response Spectrum Method

Municipalities and industries use the liquid storage tanks widely for water storage, storing inflammable liquids and various chemicals. There are primarily three types of tanks to store liquids namely underground tanks, ground supported tanks and elevated tanks. In this paper, the prime focus is on elevated water storage tanks. Water tanks are important strategic structures because they provide water to the mass of people and hence their behaviour during earthquakes must be studied in detail so that they do not undergo any huge damage due to the action of horizontal forces during an earthquake causing loss of life and property. Indian standard code IS 1893 (Part 2) helps to determine the dynamic behaviour of water tank by considering the movement of water in reference to the tank and the movement of the tank in reference to the ground. In this paper, a comparison has been made between three types of circular elevated water tanks under high seismic zone. These tanks are designed and seismically analysed using manual calculations as per IS 1893:2014 (Part 2) as well as STAAD Pro analysis using equivalent static method and response spectrum method. The tanks taken for comparison have the same capacity and parameters. This study focusses on determining the impact of geometry on water tank’s behaviour and response during an earthquake.