A simply supported beam carries a moving point load W. The maximum bending moment at a section x from left support occurs when:
Choose the correct answer
Load is at the other support
Load is placed at that section x — the maximum BM at section x occurs with load at x
Load is at midspan always
Load is at quarter-span
Correct Answer
B. Load is placed at that section x — the maximum BM at section x occurs with load at x
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Maximum BM at a section x under moving load: occurs when the load is placed AT the section (at x from A). Maximum BM(x) = W·x(L−x)/L. Maximum absolute moment occurs at midspan: M_max = WL/4. For a series of moving loads (influence line method): place loads where IL ordinates are highest — resultant of all loads and individual load straddle the midspan.
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