In the Figure, the negative bending moment at point A of the cantilever is_______kNm

Q. In the Figure, the negative bending moment at point A of the cantilever is___________kNm.

Ans: 224 to 226

Sol:

For a contilever beam lengt h ‘L’ carrying a concentrated load ‘W’ at its fixend, B. M._max = – (WL)
Here, due to point load B. M._max = (– WL) = (– 20 × 5) = – 100 kN.m.
For a contilever beam of length ‘L’ carrying on UDL ‘w’ over its entire spar B. M._max at fixed end = (WL²/2)
Here, due to UDLB, M._max = (WL²/2)

Thus, total B.M. moment at point A (fixed end) = – 100 + (– 125) = – 225 kN.m.