Seismic Behavior Assessment of Two Different Models of Reinforced Concrete Elevated Water Tanks

Abstract

Elevated water tanks are considered critical infrastructure that must remain operational after earthquakes to ensure the continued supply of drinking water and firefighting services.

This study presents an analytical investigation of reinforced concrete elevated water tanks with the objective of evaluating their structural behavior under seismic loading and identifying potential weak zones.

The analysis was carried out using the ABAQUS program through linear modal dynamic analysis, and nonlinear dynamic implicit analysis. Two models of reinforced concrete elevated water tanks with circular tank basins were analyzed. The first model is supported on a frame stage, while the second is supported on a cylindrical shaft stage. The storage capacity of the tanks is , and several water filling levels were examined.

The results provided response parameters including vibration modes, natural periodes, maximum top displacement, and stresses in concrete and reinforced steel. The findings showed behavior consistent with the expected seismic performance of reinforced concrete elevated tanks. Moreover, the results showed similar vibration modes, natural periodes, and relative displacements for both models, while the cylindrical (shaft –supported) model exhibited higher base shear.