Find the support reactions acting on the given simply supported beam of length 6 m, which is subjected to a uniformly distributed load of intensity 20 kN/m on the left half span as shown in the diagram.

F7 Savita ENG 21-12-23 D1

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SSC JE Civil 10 Oct 2023 Shift 1 Official Paper-I
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  1. 45 kN (left), 15 kN (right)
  2. −20 kN (left), 80 kN (right)
  3. 15 kN (left), 45 kN (right)
  4. 30 kN (left), 30 kN (right)

Answer (Detailed Solution Below)

Option 1 : 45 kN (left), 15 kN (right)
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Detailed Solution

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Concept 

As the 2-D beam is in equilibrium, we can apply equilibrium equations to get the support reactions.

Given

Span = 6 m

udl = 20 KN/m at left half span

Calculation 

Equilibrium equations 

Ey = 0

Ra + Rb = 20 x 3

Ra + Rb = 60      -(1)

  • EMz = 0

taking moment about B and equating it to 0

Ra x 6 - 20 x 3 x (3 + 1.5) = 0

Ra = 45 KN (left)

substituting the value of RA in equation, one to get the value of RB,

40 + Rb = 60

Rb = 15 KN (right)

 

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