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Steel and Composite Structures
  Volume 2, Number 5, October 2002 , pages 315-330

Failure mechanisms of externally prestressed composite beams with partial shear connection
A. Dall

    This paper proposes a model for analysing the non-linear behaviour of steel concrete composite beams prestressed by external slipping cables, taking into account the deformability of the interface shear connection. By assuming a suitable admissible displacement field for the composite beam, the balance condition is obtained by the virtual work principle. The solution is numerically achieved by approximating the unknown displacement functions as series of shape functions according to the Ritz method. The model is applied to real cases by showing the consequences of different connection levels between the concrete slab and the steel beam. Particular attention is focused on the limited ductility of the shear connection that may be the cause of premature failure of the composite girder.
Key Words
    external pre-stressing; composite beams; flexible shear connection; shear connection duc-tility; non-linear analysis; steel-concrete composite bridges.
PROCAM, University of Camerino, Viale della Rimembranza, 63100, Ascoli Piceno, ItalyrnInstitute of Structural Engineering, University of Ancona, Via Brecce Bianche, 60131, Ancona, Italy

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