Structural Stability Analysis for Truss Bridge

In order to analyze truss bridge's stability, Linear buckling analysis and nonlinear stability analysis have been done by ANSYS. Impact factor and nonlinearity are taken over, such as geometric nonlinearity, material nonlinearity and initial geometric defects. Then, the influence of the Lead Rubber Bearing (LRB) on structural stability was studied. The buckling modals and critical buckling load of truss bridge have been obtained. It shows that overall instability appears earlier than local instability; the critical bucking load of different types is less than linear buckling analysis result after considering nonlinearity; though its stability could be reduced by LRB, truss bridge has a good stability all the same.