Application of model updating techniques of parameter in boundary joint structure identification

Modelling of a steel truss structure was performed with finite element method.The influence of boundary joint stiffness on external modal parameter of this structure was analyzed.The results showed that only a portion components of joint stiffness had remarkable influence on it.That portion of components of joint stiffness was identified by using model updating techniques based on the measured data of modal parameter.Relatively satisfiactory results were achieved.The results also showed that the difference between the actually measured intrinsic frequency and the frequency identified was very small.The identified stiffness in this modelling condition was indeed the joint parameter of structure,so that the effectiveness and feasibility of the model updating techniques were verified for actual parameter identification problem.