Which of the following is NOT true with respect to structural cracks?

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RRB JE CE 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. Pose significant risk to the stability of the building. 
  2. Generally the damage is difficult to rectify or repair.
  3. Caused by changes in moisture, etc. on building materials. 
  4. Caused by overloading of the structural components.

Answer (Detailed Solution Below)

Option 3 : Caused by changes in moisture, etc. on building materials. 
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Detailed Solution

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Explanation:

  1. Structural cracks are caused by structural issues (e.g., overloading, poor foundation support, design flaws), not typically by moisture changes.

  2. Moisture changes affect non-structural cracks, not usually those that impact the building's structural integrity.

Additional InformationStructural Cracks

Causes:

  • Overloading of structural components (beams, columns, foundations).

  • Foundation settlement or movement due to soil shifts, shrinkage, or expansion.

  • Design or construction defects such as poor material selection, incorrect load calculations, or improper construction techniques.

  • Thermal effects (expansion and contraction due to temperature changes).

  • Seismic or wind forces that exceed the design limits.

Types of Structural Cracks:

  • Vertical Cracks: Often caused by foundation settlement or differential movement.

  • Horizontal Cracks: Typically a result of overloading or bending stresses in beams and slabs.

  • Diagonal Cracks: Can indicate shear failure or settlement issues.

  • Step Cracks: Common in masonry walls due to foundation movement.

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