GUNKLER, ERHARD1; MARX, JOHANN JAKOB2; BEYER, DRIES3.

1) Prof. Dr.-Ing. Erhard Gunkler, Hochschule Ostwestfalen-Lippe, Department of Civil Engineering, erhard.gunkler@hs-owl.de

2) Johann Jakob Marx, M. Eng. Hochschule Ostwestfalen-Lippe, Department of Civil Engineering, johann.marx@hs-owl.de

3) Dries Beyer, M. Eng. Hochschule Ostwestfalen-Lippe, Department of Civil Engineering, dries.beyer@hs-owl.de

In the investigation project an improved shear-load bearing capacity of reinforced straight lintels compared to EC6, including the composite effect of a reinforced concrete ceiling above, was verified.

Non-linear FE-Analysis was successfully used to recalculate the measured shear load bearing capacity and the deformation behaviour of the tested masonry beams (maximum size: /ℎ/=3.0/0.499/0.24 m), made of thin layer mortar, calcium silicate or clay units, reinforced with concrete steel, type B500, with a diameter of ≤ 14 mm.

The shear load bearing capacity depends on the shear slenderness (λ), which is the ratio between the impacting bending moment () and the impacting shear force multiplied by the effective depth ( ).

Values of the initial shear strength and the friction coefficients, characterizing the bonding conditions between masonry and concrete ceiling, were found in the material testing. In the masonry integrated perforate plates can increase the composite action between masonry and concrete ceiling.

Keywords: Straight masonry lintels, shear resistance, ceiling