Structural Steel Properties and Design Standards
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Questions and Answers

Which designation is used for mild steel in structural work?

  • St 32.0
  • St 44-S (correct)
  • St 44-SC
  • St 44.0

    • Steel designated as St 44.0 is suitable for welding.

    False

    What is the Young’s modulus of elasticity for structural steel ranges?

    2.04 to 2.18 x 10^5 N/mm²

    The coefficient of thermal expansion for steel is α= _______ /°C.

    <p>12 x 10^-6</p> Signup and view all the answers

    What is the physical property of steel that indicates its resistance to deformation?

    <p>Modulus of rigidity</p> Signup and view all the answers

    Match the following standards with their corresponding types of steel:

    <p>IS : 226-1975 = Structural steel (standard quality) IS : 1977-1975 = Structural steel (ordinary quality) IS : 8500-1977 = Weldable structural steel (medium and high strength) IS : 2062-1984 = Weldable structural steel</p> Signup and view all the answers

    What is the maximum thickness for welding IS : 226 structural steel without special precautions?

    <p>20 mm</p> Signup and view all the answers

    Steel designated as St 44.0 is suitable for structures subjected to high seismic forces.

    <p>False</p> Signup and view all the answers

    What is the additional advantage of IS:961 regarding steel's mechanical properties?

    <p>Lower weight without loss of strength</p> Signup and view all the answers

    Weldable qualities of steel designated as St 42-W are not developed for composite construction.

    <p>False</p> Signup and view all the answers

    What type of load refers to the permanent weight of the structure and its components?

    <p>Dead loads</p> Signup and view all the answers

    Temperature effects are considered a type of load in structural design.

    <p>True</p> Signup and view all the answers

    What are rolled structural steel sections manufactured in?

    <p>Rolling mills</p> Signup and view all the answers

    Name one factor that must be considered in the functional aspect of a structure's design.

    <p>Occupancy</p> Signup and view all the answers

    The various types of rolled structural steel sections include rolled steel _____ sections.

    <p>I-sections</p> Signup and view all the answers

    Match the following rolled structural steel section types with their corresponding description:

    <p>I-sections = Beam sections used for construction Channel sections = Used in framing and construction Tee sections = L-shaped sections for various applications Angles sections = L-shaped sections used for supports</p> Signup and view all the answers

    The loads a structure must be designed to accommodate include dead loads, live loads, wind loads, and __________.

    <p>snow loads</p> Signup and view all the answers

    How are regular steel sections defined?

    <p>Steel sections that are readily available in the market</p> Signup and view all the answers

    Match the following types of loads with their descriptions:

    <p>Dead loads = Weight of structural components Live loads = Variable loads due to occupancy Wind loads = Forces exerted by wind Seismic loads = Loads due to geological activities</p> Signup and view all the answers

    Which of the following types of loads would be the most variable and change over time?

    <p>Live loads</p> Signup and view all the answers

    Special sections are produced in rolling mills and have frequent market demand.

    <p>False</p> Signup and view all the answers

    Fatigue is not a significant factor in structural design.

    <p>False</p> Signup and view all the answers

    The rolled steel beams are classified into four series as per BIS: IS: _____ for Indian Standard Joint Beams.

    <p>808-1989</p> Signup and view all the answers

    What is the purpose of estimating the loads when designing a structure?

    <p>To ensure safety and stability of the structure.</p> Signup and view all the answers

    What designation is given to structural steel used for dynamic loading where welding is involved?

    <p>St 42-W</p> Signup and view all the answers

    Copper bearing quality of structural steel is denoted as St 42-WC.

    <p>True</p> Signup and view all the answers

    What factor is used to account for the dynamic effects caused by moving loads?

    <p>Impact factor</p> Signup and view all the answers

    What is the maximum carbon content allowed for welding elements of thickness less than 28 mm?

    <p>0.22 per cent</p> Signup and view all the answers

    All structural members are exempt from temperature effects.

    <p>False</p> Signup and view all the answers

    The high tensile steel classes include St 58-HT, St 55-HTW, and their corresponding ______ quality.

    <p>copper bearing</p> Signup and view all the answers

    What is defined as the resistance to deformation in a structural member?

    <p>Stress</p> Signup and view all the answers

    Match the following structural steel grades with their characteristics:

    <p>St 58-HT = Welding prohibited St 55-HTW = Welding allowed Fe 540 = Medium strength quality Fe 440 = Medium strength quality</p> Signup and view all the answers

    Which of the following designates high tensile steel intended for use where welding is employed?

    <p>St 55-HTW</p> Signup and view all the answers

    The impact load is determined by the product of the impact factor and the __________.

    <p>live load</p> Signup and view all the answers

    Which of the following combinations produces maximum stresses for design purposes?

    <p>Dead load + Imposed load + wind or earthquake loads</p> Signup and view all the answers

    Steel is produced in the form of ______ and converted to different shapes.

    <p>ingots</p> Signup and view all the answers

    The IS: 8500-1977 standard pertains to low strength weldable structural steel only.

    <p>False</p> Signup and view all the answers

    Match the types of loads with their definition:

    <p>Axial stress = Stress along the length of the member Tensile stress = Stress that attempts to elongate a member Compressive stress = Stress that attempts to shorten a member Shear stress = Stress that causes sliding between layers</p> Signup and view all the answers

    The allowable stress must be exceeded to account for design loads and temperature effects.

    <p>False</p> Signup and view all the answers

    What occurs to structural materials as a result of temperature variation?

    <p>Expansion and contraction</p> Signup and view all the answers

    What is the minimum pitch distance for rivets?

    <p>2.5 times the gross diameter of the rivet</p> Signup and view all the answers

    In diamond riveting, efficiency is lower compared to other types of riveting.

    <p>False</p> Signup and view all the answers

    What is the purpose of ensuring that the centroidal axes of members meeting at a joint intersect at one point?

    <p>To provide adequate resistance in the connection and ensure structural stability.</p> Signup and view all the answers

    The maximum pitch for tension members should not exceed ________.

    <p>16t or 200 mm</p> Signup and view all the answers

    Match the following specifications with their respective details:

    <p>Minimum Edge Distance = 1.5 times the gross diameter of the rivet Maximum Compression Member Pitch = 12t or 200 mm Maximum Tension Member Pitch = 16t or 200 mm Rivet Centroid Requirement = On the line of action of load</p> Signup and view all the answers

    Which of the following statements is true regarding the center of gravity of a group of rivets?

    <p>It should be on the line of action of load whenever practicable.</p> Signup and view all the answers

    The design strength of riveted joints is calculated based on the actual strength of the area being joined.

    <p>True</p> Signup and view all the answers

    What should be provided if there is any eccentricity in a joint?

    <p>Adequate resistance in the connection.</p> Signup and view all the answers

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