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Q: If the load on an RCC lintel due to the wall above it is in the form of a triangular portion, then the angle subtended by a triangle at either end of the lintel shall be:
  • A. 60 degrees each
  • B. 40 degrees each
  • C. 30 degrees each
  • D. 50 degrees each
Correct Answer: Option A - If the load on a RCC lintel due to the wall above it is the form of a triangular portion, then the angle subtended by a triangle at either end of the lintel shall be 60º each. • When any other load is coming between the lintel and horizontal plane is 25 cm above the apex of the equilateral triangle over the lintel, then lintel is designed for load. • When floor load is applied below the apex of the triangle or the height of masonry is up to 1.25 times the effective span, arch action is not possible.
A. If the load on a RCC lintel due to the wall above it is the form of a triangular portion, then the angle subtended by a triangle at either end of the lintel shall be 60º each. • When any other load is coming between the lintel and horizontal plane is 25 cm above the apex of the equilateral triangle over the lintel, then lintel is designed for load. • When floor load is applied below the apex of the triangle or the height of masonry is up to 1.25 times the effective span, arch action is not possible.

Explanations:

If the load on a RCC lintel due to the wall above it is the form of a triangular portion, then the angle subtended by a triangle at either end of the lintel shall be 60º each. • When any other load is coming between the lintel and horizontal plane is 25 cm above the apex of the equilateral triangle over the lintel, then lintel is designed for load. • When floor load is applied below the apex of the triangle or the height of masonry is up to 1.25 times the effective span, arch action is not possible.