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For the beam loaded as shown in figure, Calculate the support reactions.[Figure: cantilever AB, 3 m long, fixed at A (left wall). A UDL of 10 kN/m acts over the first 2 m from A. At 2 m from A, a 20 kN force acts downward to the left, inclined at 60°…

Q.6 (A) For the beam loaded as shown in figure, Calculate the support reactions.

[Figure: cantilever AB, 3 m long, fixed at A (left wall). A UDL of 10 kN/m acts over the first 2 m from A. At 2 m from A, a 20 kN force acts downward to the left, inclined at 60° to the beam (angle measured on the right side, between the force and the beam). A vertical load of 15 kN acts downward at the free end B (3 m from A).]

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Loads: UDL resultant = 10 × 2 = 20 kN at 1 m from A. Inclined 20 kN: vertical component \(20\sin60^\circ = 17.32\) kN (↓), horizontal component \(20\cos60^\circ = 10\) kN (← towards A).

\(\sum F_x = 0:\ H_A - 10 = 0 \Rightarrow H_A = 10\) kN (→)

\(\sum F_y = 0:\ V_A = 20 + 17.32 + 15 = 52.32\) kN (↑)

\(\sum M_A = 0:\ M_A = 20(1) + 17.32(2) + 15(3) = 20 + 34.64 + 45 = 99.64\) kN·m (anticlockwise fixing moment at A)

Resultant reaction \(R_A = \sqrt{10^2 + 52.32^2} = 53.27\) kN at \(\tan^{-1}(52.32/10) = 79.18^\circ\) to the horizontal.

Answer: \(H_A = 10\) kN →, \(V_A = 52.32\) kN ↑ (R = 53.27 kN at 79.18°), fixing moment \(M_A = 99.64\) kN·m anticlockwise.

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report
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