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Step 1: Apply load P ( →) at B and solve for reactions
Step 1: Apply load P ( →) at B and solve for reactions



Step 2: Calculate internal forces in truss members in terms of P
Step 2: Calculate internal forces in truss members in terms of P



Step 3: Construct table for N, ∂N/∂P, N(P = 0), L and N(∂N/∂P)L
Step 3: Construct table for N, ∂N/∂P, N(P = 0), L and N(∂N/∂P)L



Step 4: Use Castigliano's formula to get Δ _{B} ( →)
Step 4: Use Castigliano's formula to get Δ _{B} ( →)



Useful formula:
Useful formula:



Now that you've mastered this question, you can try Question 1.