Bearing Stress Under a Masonry Lintel
Mediummasonrylintelbearing
A simply supported masonry lintel has an analysis span of 2.4 m and carries a total factored uniform load of 12 kN/m including self-weight. Each end bears on a patch 150 mm along the span by 190 mm across the wall. Assuming no arching and uniform pressure, what is the average bearing pressure at one support?
- A0.253 MPa
- B0.505 MPa
- C1.01 MPa
- D5.05 MPa
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Answer: B. 0.505 MPa
Total load = 12 × 2.4 = 28.8 kN; each support takes half: R = 14.4 kN. Contact area = 150 × 190 = 28,500 mm². Pressure = 14,400 N / 28,500 mm² = 0.505 MPa (505 kPa). 1.01 MPa puts the whole 28.8 kN on one end. 0.253 MPa uses wL/4 = 7.2 kN, as if arching or load sharing reduced the reaction, which the stated model does not include. 5.05 MPa has a factor-of-10 slip in the area (2,850 mm²).
kN MPa
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