Nonlinear behavior is often observed in structural joint system due to external loads. In this paper, a new nonlinear structural model updating method based on static responses is proposed to investigate the actual behavior of a joint system. An appropriate finite element model is first established to characterize the nonlinear behavior of the joints. Combined with the sensitivity analysis, the parameters which describe the nonlinear force-displacement relationship of the joint are considered as the updating parameters. Then, an objective function is created based on the difference between experimental and analytical static deflections. Finally, with simulated annealing algorithm, the optimal values of the nonlinear joint model parameters are obtained. A cantilever beam with nonlinear joint supports is simulated as a numerical example. The obtained results show that the proposed method can effectively update the nonlinear joint model and the updated model can further predict true deflections of the nonlinear structure.
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