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Q: Which of the following statements is true ? A. A roller is provided at end of a bridge truss to allow thermal expansion. B. A roller provides freedom of deformation in horizontal plane in case of thermal expansion.
  • A. Only A
  • B. Only B
  • C. Both A and B
  • D. None of these
Correct Answer: Option C - The roller support doesn't have any horizontal reaction so when the expansion due to increase in temperature occurs, the roller moves from its position thus the buckling due to expansion is avoided.
C. The roller support doesn't have any horizontal reaction so when the expansion due to increase in temperature occurs, the roller moves from its position thus the buckling due to expansion is avoided.

Explanations:

The roller support doesn't have any horizontal reaction so when the expansion due to increase in temperature occurs, the roller moves from its position thus the buckling due to expansion is avoided.