International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 03 | Mar 2024
p-ISSN: 2395-0072
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SEISMIC ANALYSIS AND DESIGN OF ELEVATED WATER TANK WITH COMPREHENSIVE SOIL-STRUCTURE INTERACTION ASSESSMENT Sangeetha1, Jayadeep K S2, L. Govindaraju3 1P.G Student, Department of Civil Engineering, U.V.C.E, Bangalore University, Bengaluru
2 Assistant Professor, Department of Civil Engineering, Raja Reddy Institute of technology, Bengaluru 3 Professor, Department of Civil Engineering, U.V.C.E, Bangalore University, Bengaluru
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Abstract -Elevated water tanks have irregular mass
their structural integrity, efficiency, and reliability. In many regions, the availability of flat land suitable for tank installation is limited, leading to the construction of water tanks on sloped ground. However, the unique challenges posed by sloped terrain necessitate careful consideration in the design and placement of water tanks to ensure optimal performance and longevity.
distribution, making them susceptible to amplified seismic forces during earthquakes, potentially leading to structural failure or damage. Proper reinforcement and seismic design are essential to mitigate these risks and ensure reliable water distribution. The seismic performance of elevated water tanks is crucial for ensuring public safety and water supply resilience, especially in earthquake-prone regions. Elevated tanks face significant lateral loads due to their height and mass distribution. Neglecting Soil-Structure Interaction (SSI) in seismic analyses can lead to inaccurate assessments of structural behavior. This study investigates the seismic behavior of elevated water tanks on both level and sloping ground, considering fixed and flexible bases using the Response Spectrum Method (RSM) in accordance with IS 1893(Part 1): 2016, for seismic zones II and III, Finite Element Analysis (FEA) software SAP2000 v22 is employed to evaluate the effects of SSI. Three soil types soft, medium, and hard are considered, accounting for full and empty tank conditions. The numerical analysis reveals variations in structural response under seismic loading, with different slope angles exposing vulnerabilities associated with sloping ground. Results underscore the importance of incorporating SSI effects in seismic analysis to obtain realistic assessments of water tank performance. The inclusion of SSI captures the dynamic interaction between the tank and underlying soil, providing a more comprehensive understanding of structural behavior during seismic events. This study highlights the necessity of considering SSI in the design and assessment of elevated water tanks, particularly in earthquake-prone areas. By accounting for SSI, engineers can better mitigate risks and enhance the seismic resilience of water supply infrastructure.
Water tanks positioned on sloped terrain introduce complexities that significantly impact their structural stability and seismic resilience. Unlike on level ground, the uneven foundation on a slope can lead to differential settlements, tilting, and rotation of the tank, posing risks to structural integrity. Additionally, gravitational forces acting on stored water increase lateral loads, heightening the potential for overturning moments and structural failure, especially during seismic events. Soil-Structure Interaction (SSI) effects become more pronounced, amplifying seismic forces, and exacerbating structural responses. The presence of a slope also raises the risk of sliding, particularly if foundations are inadequately anchored or soil conditions are unstable. Seismic events further intensify this hazard, potentially resulting in displacement or collapse. Understanding these complexities is crucial for engineering solutions that enhance the stability and resilience of water tanks on sloped ground, ensuring the safety and reliability of water supply infrastructure in challenging terrain conditions.
1.1 Soil-Structure Interaction (SSI) Soil-Structure Interaction (SSI) is a fundamental aspect of structural engineering that considers the dynamic interplay between a structure and the underlying soil. In seismic regions, this interaction becomes paramount due to the potential for ground motion to significantly affect the behavior of structures. Traditionally, structural analysis has often neglected the influence of soil on structural response, treating structures as isolated entities.
Key Words: Soil-Structure Interaction (SSI), Sloping Ground, Response Spectrum Method (RSM), Elevated water tank, Seismic zones.
1.INTRODUCTION
However, in reality, the characteristics of the soil play a crucial role in determining how a structure will behave during seismic events. Factors such as soil stiffness, damping properties, and soil-structure resonance can all impact the structural response.
Elevated water tanks are essential infrastructure components for various applications, including domestic, industrial, and agricultural purposes. The design and placement of these tanks are critical factors influencing
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