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Step 1: Calculate internal forces in truss members due to real external load
Step 1: Calculate internal forces in truss members due to real external load



Step 2: Calculate internal forces in truss members due to virtual load
Step 2: Calculate internal forces in truss members due to virtual load



Step 3: Construct table of n, N, L and nNL for all members
Step 3: Construct table of n, N, L and nNL for all members



Step 4: U_{e} = U_{i} to calculate Δ _{B} ( →)
Step 4: U_{e} = U_{i} to calculate Δ _{B} ( →)



Useful formula:
Useful formula:



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