In the 'unit load method' (virtual work) for finding deflection of a truss, the formula used is:
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δ = M²L/(2EI)
δ = Σ(nNL/AE) for trusses — unit load method (virtual work)
δ = ΣN²L/(2AE)
δ = WL³/(3EI)
Correct Answer
B. δ = Σ(nNL/AE) for trusses — unit load method (virtual work)
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Unit load method: δ = Σ(nNL/AE) where n = member force due to UNIT virtual load at the desired deflection point, N = member force due to actual applied loads, L = member length, A = cross-sectional area, E = elastic modulus. Each member contributes to deflection. Very efficient for trusses (no integration needed).
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