International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 02 | Feb 2024
p-ISSN: 2395-0072
www.irjet.net
The Seismic Behaviour of an Elevated Storage Reservoir Across Different Earthquake Regions Akash Devidas Bobade1, Dr. S. K. Patil 2, Dr. A. B. Pujari 3 1 Post Graduate Student, Department of Civil Engineering, KJCOEMR, Pune, India 2 Associate Professor, Department of Civil Engineering, KJCOEMR, Pune, India
3 Associate Professor, Department of Civil Engineering, KJCOEMR, Pune, India
------------------------------------------------------------------------***------------------------------------------------------------------------Abstract - Elevated water tanks play a crucial role in earthquake-prone regions, serving as vital structures that store liquids in containers situated at the top of supporting systems (staging). These structures are particularly susceptible to seismic forces during earthquakes, impacting essential functions such as water supply, fire-fighting systems, and industrial water storage. Damage to these tanks can lead to significant issues, including disruptions in drinking water supply and uncontrollable fires in industries dealing with flammable fluids. Maintaining the functionality of elevated water tanks post-earthquake is imperative. Consequently, extensive studies have been conducted to understand the seismic behaviour of these tanks under various conditions. In this investigation, we focus on analyzing tanks subjected to seismic forces, considering different seismic zones and container shapes (rectangular and circular) with a constant staging height. The analysis employs time history analysis, varying seismic zones, and tank shapes, specifically rectangular and circular. The study is conducted under empty tank conditions. Seismic forces acting on the tank are assessed using the Time history analysis method for earthquake zones 2 and 5, utilizing the ETABS software. Key seismic responses, including story displacement, story drift, time history analysis along the X-axis, and time history analysis along the Y-axis, are thoroughly evaluated and compared.
Key words: Seismic forces, tank shape, Time history analysis, Earthquake zones, ETABS. 1. INTRODUCTION The elevated water tank holds a crucial role in the water supply infrastructure, and its location significantly influences supply regulation. The topography also plays a vital role in the distribution system, with the elevated storage tank typically positioned at a higher point, often at the center of the distribution network. These tanks are supported by staging, typically consisting of RCC towers or columns with various bracing configurations. In this project, the focus is on studying the impact of different seismic zones on different shapes of elevated storage tanks. The objective is to determine which tank shape exhibits greater resistance to seismic activity. The examination of various H/D ratios aims to understand the tank's strength in resisting seismic waves. 1.1Performance of elevated water tank Geological and seismological discoveries during the 20thcentury have helped in initiating the development of seismic building codes and earthquake resistant buildings and structures. The improvement in seismic design requirements has led to more robust, safe and reliable buildings. Due to the earthquake many buildings collapsed killing thousands of people. Therefore, to protect the earthquake effects/earthquake damages to the buildings and to protect the life of people, it’s important to use seismic control techniques. 1.2 Various analysis systems 1.2.1 Linear Static Analysis: Linear analysis methods give a good indication of the elastic capacity of the structures and indicate where first yielding will occur. The linear static method of analysis is limited to small, regular buildings. 1.2.2 Linear Response Spectrum Analysis: Linear response spectrum analysis is the most common types of analysis used. This is sufficient for almost all isolation system based on LRB and / or HDR bearings. 1.2.3 Non-Linear Static Analysis: In a nonlinear static analysis procedure, the building model incorporates directly the nonlinear force-deformation characteristics of individual’s components and elements due to inelastic material response. The nonlinear force-deformation characteristics of the building are represented by a Pushover curve.
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