INVESTIGATING MULTI-DIRECTIONAL SEISMIC EFFECTS ON ELEVATED WATER TANKS: METHODOLOGY AND RESULTS

Water towers play a Key role in supporting urban infrastructure, particularly in seismic regions where their collapse can endanger the safety of the public. In this work, A seismic analysis of elevated water tank is carried out (full, half, and empty) using Newmark-Beta time integration procedure with Summation square root of sum of squares (SRSS) method for multi directional analysis. The analysis uses the Newmark-Beta time integration scheme to interpret the dynamic response of the tank under bi-directional seismic loading. The natural period of the tank goes from 0.412 s (empty) 0.856 s (full), whereas the maximum Lateral displacement is 0.28 mm and Base shear forces of 215.4KN under full condition. Structural calculations verify that drift ratios are below 0.5% (IBC,2021) with uniform stress distribution in the columns. The results highlight the need for factoring of fluid-structure interaction and multi-directional analysis in seismic design codes