An isosceles triangular frame with rotationally resistive joints under a tip load is studied. The large in-plane deformation elastica equations are formulated. Stability analysis shows the frame can buckle symmetrically or asymmetrically. Post-buckling behavior
showing limit load and hysteresis are obtained by shooting and homotopy numerical
algorithms. The behavior of a frame with rigid joints is studied in detail. The effects of
joint spring constant and base length are found
