Abstract
The ultimate strength of steel plates with longitudinal stiffeners of open or closed cross-section subjected to bi-axial in-plane forces is experimentally investigated in this study. Six stiffened plate specimens corresponding to 1/3 times a stiffened plate panel of the steel deck plate in an actual bridge were tested by using an experimental apparatus newly developed for this study. The test results verify an interaction curve for the ultimate strength which have been developed by the authors for predicting the ultimate strength of stiffened plates under biaxial in-plane forces.
