Evaluation of the Stress Distributions on Gusset Plate Connections in Historic Steel Truss Bridges

A new evaluation procedure for the gusset plate connection in steel truss bridges is presented in this paper. First, a finite element (FE) model of gusset plate connection subassemblage is built to accurately represent stress distributions on gusset plates. Then, approximate stress distribution models at the critical sections of a gusset plate are developed by observation and compare with the FE results as well as the methods used in current practice. These approximate stress distribution models show good agreement with the FE results. The maximum Von Mises stress on the gusset plate can be quickly calculated by using these approximated stress distribution models. The procedure developed in this paper provides bridge engineers a more accurate method to evaluate the remaining strength of gusset plate connections in historic and aged steel truss bridge.