Non linear behaviour of steel–concrete epoxy bonded composite beams

The bonding connection in steel–concrete composite beams is investigated in the case of static loading and normal strength concrete. Two 3-point bending tests performed on 4 meter span beams confirm that bonding could be very efficient allowing a large plastic strain without any shear failure if the bonding joint is properly designed. The measurements are close to the numerical results provided by non-linear beam models or non-linear FE model. However all the studied beam models do not allow a very accurate prediction of the behaviour close to the interface at failure in the case of shear failure. A realistic shear failure criterion suitable for bonded composite beams may improve numerical results.

Research highlights
► Connection in steel–concrete beams–No shear failure if the bonding joint is properly designed.
► Modelling by FEM or non-linear beam approach (cross-sections divided into thin layers).
► Shear failure in the central zone of the beam–Realistic steel–concrete shear failure criterion required.