Slip locking in finite elements for composite beams with deformable shear connection

In this paper, the authors discuss problems that may occur in the finite element analysis of composite beams with deformable shear connection, where slip arises between beam components while contact is preserved. Effects of locking problems, comparable to the membrane and shear locking that may develop in finite elements for common beams, are illustrated. These locking problems mostly affect the description of the curvature and interface slip. A strategy to avoid locking by means of a calibrated choice of the displacement shape functions is then proposed and a comparison between different displacement-based elements, in terms of local error, global error and convergence rate, is presented. The authors also illustrate the effects of slip locking on mixed finite elements and comparisons between displacement-based and mixed elements are shown.

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