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

Raihana M.  Ejam; Hatem Hadi  Obeid; Hussein Talab  Nhabih

doi:10.30572/2018/KJE/170129

Authors

Raihana M. Ejam MSC. Student, Department of Mechanical Engineering, University of Babylon, Iraq
Dr. Hatem Hadi Professor, Department of Mechanical Engineering, University of Babylon, Iraq
Dr. Hussein Talab Nhabih Assistant Professor, Department of Civil Engineering, University of Babylon, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/170129

Keywords:

Seismic Damage, Structural Resilience, Earthquake Mitigation, Passive Energy Dissipation, Base Isolation Techniques, Seismic Analysis Methods, Structural Retrofitting

Abstract

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

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