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Application of base isolation systems in seismic design of steel water storage tanks
Author(s)
Matar, Khaled I. H.
Date Issued
2026
Type
master thesis
Publisher
Cape Peninsula University of Technology
Abstract
This study examines the seismic behaviour of a modular steel water storage tank equipped with a base isolation system, focusing on the friction pendulum system (FPS) as the primary isolation mechanism. Analytical models were developed using the lumped mass analogy technique, where the masses are referred to as convective, impulsive, and base masses. Numerical simulations were performed using Abaqus software, considering fluid-structure interaction, to simulate the dynamic behaviour of an isolated tank under seismic excitation. A comparative analysis was undertaken between isolated and non-isolated tanks and those incorporating an FPS to assess the system’s efficiency. Moreover, the study was conducted to measure the effects of key system parameters on the base isolation of liquid storage tanks. Key parameters considered in this study include the tank’s aspect ratio, isolation period, and friction coefficient. The objective was to assess the performance of a tank supported by friction pendulum bearings (FPS). The application of base isolation in steel water storage tanks can produce different results, influenced by factors such as isolation system design, tank properties, seismic intensity, and overall structural stability. To achieve the desired results, conducting a comprehensive engineering analysis and considering design elements were crucial. The approach involved the application of simulation-based analysis to investigate how base isolation affected the seismic response of tanks during an earthquake. The research established the efficiency of the isolation system in alleviating fluid-induced forces by attaining potential stability, less hydrodynamic pressure, wall buckling risk reduction, better control of water behaviour, decrease and stable bearing shear impact in isolated tanks compared to non-isolated tanks.
Additional information
Thesis (MEng (Civil Engineering))--Cape Peninsula University of Technology, 2026
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Matar, K_219037175 (2).pdf
Size
3.33 MB
Format
Adobe PDF
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