Shear Capacity of the Zone of Supporting of Precast Lintels Made of AAC

The paper presents the experimental results and analytical calculations of shear capacity of the ends of precast lintels made of Autoclaved Aerated Concrete (AAC). Three series of elements with that same span but with different dimensions of specimens' crosssection and types of reinforcement were taken into consideration. The lintels were tested in four-point bending test but the mode of damage indicate low shear capacity of lintels. During the tests forces, displacement and cracks propagation were recorded. The analytical calculations of shear capacity of the lintels were conducted according to three codes: PN-EN 1992-1-1:2008, PN-EN 12602, PN-84/B-03264. The analytical results were compared with test results. Significant influence of the method of anchoring of the longitudinal bars on the shear capacity of the beams has been shown. The analytical result of shear capacity gave danger values if the longitudinal bars were not properly anchored. Analytical calculations of longitudinal bars anchorage capacity in AAC precast lintels must be conducted mandatory.