1. The problem statement, all variables and given/known data Solve for support reactions of a rigid, rectangular steel frame sitting on rubber pads at the four corners (See attached), when a shear force and a moment is applied at some point on the frame. All the known variables are shown in black while the unknown are in red. It is a two-dimensional problem. 2. Relevant equations Force balances : Sum of X = T & Sum of Y = 0 Moment balance about point 1 (upper left hand corner) : (X3+X4)W + (Y2+Y3)L - M = 0 3. The attempt at a solution There are eight unknown reaction forces and three equilibrium equations. It seems like a statically indeterminate structure to the degree of 5 (8 unknowns - 3 equations). Could anyone offer help on how to find the appropriate compatibility equations? Thank you!