ANALYTICAL AND EXPERIMENTAL STUDY OF THE SHEAR TRANSFER IN PRE-CAST CONCRETE MODELS CONSIDERING THE INFLUENCE OF ROUGHNESS AND THE STRENGTH OF CONCRETE FILLING

Abstract

Due the scenario in the civil construction industry, new constructive processes are being used for construction of small and medium size structures, as is the case of systems formed by double precast concrete panels lattice filled with concrete cast in place. This study aimed to investigate analitically and experimentally, the factors that affected the shear strength on the interface between concrete cast at different ages. In experimental program was tested 26 models subject to a direct shear taking into account different thickness of concrete filling as 7 cm, 9 cm and 13 cm, with smooth and rough interfaces, as well as different the concrete of compressive strength. The models results under direct shear showed that the reinforcement amount which crosses the interface, the concrete compressive strength, the interface surface and a lowest ratio between the thickness of the filling region of concrete and precast concrete improves the behavior of the structural element. In general, the models with smooth interface slided in the order of 10-2 mm while the rough surfaces models were in the order of 10-3 mm. Keywords: double panels lattice, direct shear, roughness, tranfer of shear forces.