A 'simply supported' RC beam with UDL carries maximum bending moment at:
Choose the correct answer
At the supports
At midspan — M_max = wL²/8; supports have maximum shear but zero bending moment
At quarter-span
Uniformly throughout span
Correct Answer
B. At midspan — M_max = wL²/8; supports have maximum shear but zero bending moment
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For SS beam under UDL w per unit length, span L: BM at distance x from support = (wLx/2) − (wx²/2) = wx(L-x)/2. Maximum at x=L/2 (midspan): M_max = wL²/8. Critical section for design = midspan for bending. Shear: maximum at supports = wL/2 (critical for shear check at d from support). Deflection maximum at midspan = 5wL⁴/(384EI).
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