Identification of Semi-rigid Connections in Pultruded GFRP Profiles by Using Model Updating in Dynamics

摘要

The model updating techniques in dynamics have been applied to identifing the mechanical behavior of bolted connections for pultruded GFRP framed structural systems used in civil construction. Rotational and translational joint stiffnesses have been identified. Framed structures are usually designed on the basis that the connections are either pinned or rigid. However, the real behavior of the joints is semi-rigid, which will influence the response of the structure as a whole and so it is necessary to know the behavior of the joint. This knowledge allows an adequate degree of safety for the ultimate and serviceability limit states in design process. Unknown stiffnesses are identified by a technique of model updating from dynamic tests. The used formulation is based on the minimization of the eigensolution residuals. Results obtained by experimental tests show the efficiency of the proposed procedure.