A simply supported beam with a span length of 4 m carries a uniform load of intensity 5 N/m throughout its length. What will the value of the maximum bending moment (in N - m) in the beam be?

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RRB JE ME 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. 10
  2. 0
  3. 20
  4. 4

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Option 1 : 10
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Concept:

The maximum bending moment in a simply supported beam carrying a uniformly distributed load (UDL) occurs at the mid-span and is calculated using the formula:

\[ M_{\text{max}} = \frac{wL^2}{8} \]

where:
w = Load intensity per unit length (N/m)
L = Span length (m)

Given:

  • Span length ( L ) = 4 m
  • Uniform load intensity ( w ) = 5 N/m

Step 1: Calculate the maximum bending moment

\[ M_{\text{max}} = \frac{wL^2}{8} = \frac{5 \times (4)^2}{8} = \frac{5 \times 16}{8} = \frac{80}{8} = 10 \, \text{N·m} \]

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