1. The problem statement, all variables and given/known data No specific problem. 2. Relevant equations 1/ρ=M(x)/EI Internal Work = External Work δ = ∂U/∂P 3. The attempt at a solution N/A ----------------- So I have a question about solving for deflections in various structural members, frames and trusses. So far, I find myself utilizing Virtual Work method to solve for displacements exclusively. I keep trying to discover situations where I would have to use the Euler-Bernoulli Beam Equation or Castigliano's method because Virtual Work is inapplicable but I have yet to do so. Is there a situation where Virtual Work can not be utilized to solve for displacements but the others can be? Or can I safely stick to my most comfortable method in every case?