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The IUP Journal of Mechanical Engineering

Seismic Assessment and Retrofitting of an Elevated Water Tank Using Active Tendon Control

Article Details

Pub. Date	: May, 2022
Product Name	: The IUP Journal of Marketing Management
Product Type	: Article
Product Code	: IJMM040522
Author Name	: Sarit Chanda
Availability	: YES
Subject/Domain	: Marketing
Download Format	: PDF Format
No. of Pages	: 08

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Abstract

The paper presents a seismic assessment and advanced retrofit study on a reinforced concrete elevated water storage tank. Retrofitting of old heritage water tanks like Tala Tank in Kolkata is very essential, otherwise these old structures may collapse any time. The dynamic behavior of the fluid is simulated using the classical convective and impulsive mass model, for which a discrete three-dimensional schematization is initially implemented in the finite element model. The timehistory assessment inquiry highlights excessive deformation of the water tank or even collapse of the frame structure. Based on these results, one retrofitting technique is proposed, namely, an active tendon system. The mechanical parameters, design criteria and technical implementation details are illustrated. The verification time-history analyses in protected conditions show that a substantial enhancement of the seismic response capacities of the structure is attained as compared to the original structure.

Introduction

Water storage tanks represent strategic lifelines, especially in earthquake-prone regions, for their essential role in fighting fires, as well as in mitigating the consequences of water shortage resulting from damage to municipal water storage and pipelines. Water tanks have been traditionally built in an elevated position over a supporting structure, to reach the pressurization required by the supply system simply by gravity, limiting the action of pumps to the refilling phase. As a consequence, elevated water tanks are usually rather tall and slender. This marks significant geometrical and structural differences with storage tanks for liquids of industrial use, such as oils, petroleum, nitrogen and liquefied natural gases, most of which are broad in plan and ground support.

The supporting structure of elevated tanks, mainly constituted by pre-normative R/C frames or R/C (or masonry) shaft-type shells, and in few cases by steel braced frames, is generally the weakest portion of the structural system, which determines