Non-linear analysis of steel semi-rigid diagonal-to-column joint is presented in the paper. Investigated joint is a part of a structural system, which was often used in Slovakia. The results from analysis will help with the correct preparation of a test. Evaluation of stiffness and resistance of this joint is the purpose. These parameters are the input values for efficient analysis of structures by component method. The aim of work is to detect joint resistance under cyclic loading and to identify its failure mechanism. Final aim is to establish the influence of joints to the whole structure.
The primary aim of the paper is to present a simple method for determining the changes in stiffness of a composite beam. The experimental model was made from wood and plaster boards. It was simply supported beam with a length of 4 m. Accelerations were measured at 24 points along the beam. In either case data for intact and damaged models were acquired. The identification of the damage was done using a code developed by the authors. The vertical mode-shapes were analyzed, so changes in the stiffness could be detected.