Design of Circular Tanks
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Design of Circular Tanks

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Questions and Answers

What should be the approach to analyze shear forces in the design of circular tanks?

  • Analyze shear distribution only at the base of the tank.
  • Analyze shear distribution in both the tank walls and base. (correct)
  • Ignore shear distribution in the tank walls for simplicity.
  • Assume uniform shear distribution throughout the tank.
  • Which parameter is NOT considered in the calculation of the factored load for circular tanks?

  • Live load
  • Dead load
  • Wind load (correct)
  • Snow load
  • During the design for shear strength, what must be checked against applied shear forces?

  • The reinforcement area only.
  • The bending moments.
  • The moment capacity.
  • The shear capacity. (correct)
  • What is a key difference between the working stress method and the limit state method in tank design?

    <p>Limit state method accounts for various load factors.</p> Signup and view all the answers

    How should deflections and crack widths be handled during design?

    <p>They must be within permissible limits as per the serviceability limit state.</p> Signup and view all the answers

    Which of the following does not form part of the design checks for concrete reinforcement according to IS 456?

    <p>Soil bearing capacity.</p> Signup and view all the answers

    When designing a flexible base tank, what assumption is made regarding the base under load?

    <p>The base will deform under load.</p> Signup and view all the answers

    What should be included in the quality control aspects during construction of circular tanks?

    <p>Inspection of materials used based on IS codes.</p> Signup and view all the answers

    In the context of calculating hydrostatic pressure in circular tanks, which formula is used?

    <p>P = γ * h</p> Signup and view all the answers

    What aspect is emphasized by both the working stress method and the limit state method in circular tank design?

    <p>Safety and serviceability.</p> Signup and view all the answers

    Study Notes

    Design of Circular Tanks

    • Two main methods are used to design circular tanks: Working Stress Method and Limit State Method
    • Site Investigation is crucial for both methods and includes determining soil properties like bearing capacity
    • Tank Geometry includes diameter, height and capacity

    Working Stress Method

    • The Working Stress Method assumes the base acts as a rigid plate
    • Load considerations include hydrostatic pressure, dead load, and live load
    • Hydrostatic pressure is calculated using the formula P = γ * h (γ = unit weight of liquid, h = height of liquid)
    • Design Steps involve calculating bending moments, shear forces in the tank walls and base, and selecting concrete grades as per IS 456
    • Stress analysis ensures stresses are within allowable limits and reinforcement is designed based on moment and shear calculations
    • Serviceability check: ensures deflections are within acceptable limits

    Limit State Method

    • The Limit State Method is considered more comprehensive than the Working Stress Method
    • Load Combinations are used as per IS 3370-2021
    • Ultimate Limit State (ULS) Analysis calculates maximum bending moments and shear forces at ULS
    • Ultimate Load Calculation is based on factored loads: Factored Load = 1.5 × Dead Load + 1.5 × Live Load
    • Bending Moment and Shear Force Analysis use structural analysis techniques
    • Design For Flexural Strength involves calculating the required depth of the section and reinforcement area
    • Design for Shear Strength compares shear capacity to applied shear forces
    • Serviceability Limit State Check ensures deflections and crack widths are within permissible limits

    General Considerations

    • Reinforcement Detailing follows guidelines from IS codes
    • Quality Control is essential during construction to ensure compliance with standards
    • Regular Maintenance includes inspection and maintenance for long-term integrity

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    Description

    This quiz covers the design principles for circular tanks using both the Working Stress Method and Limit State Method. Key concepts such as soil investigation, tank geometry, load considerations, and stress analysis are explored. It also includes calculations for bending moments and shear forces critical for safe and efficient tank design.

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