EXPERIMENTAL STUDY ON SHEAR BEHAVIORS AND BEARING CAPACITY OF SHEAR WALLS BUILT WITH PRECAST CONCRETE TWO-WAY HOLLOW SLABS WITH VERTICAL JOINTS

Abstract

Based on the pseudo-static test of five shear walls built precast concrete two-way hollow slabs with vertical joints, the connection behavior of vertical joints is discussed. The effects of key parameters including axial compression ratio, shear span ratio and the number of horizontal reinforcement on the connection behavior of vertical joints and mechanical properties of shear walls have been studied. The result shows that the brittle failure is avoided, the ultimate displacement angle is larger than 1/100, and the displacement ductility ratio was larger than 5.0. During the application stage, the vertical joint is good and the connection between different horizontal assembly units is reliable. When the axial compression increases from 0.15 to 0.25, the shear bearing capacity increases 11.8%, but peak displacement angle decreases 22.5%. As the increase of shear span ratio, the shear bearing capacity decreases significantly. When the number of horizontal reinforcements increases 56%, shear bearing capacity increases 11%. In addition, considering the influence of an interface structure on shear stress, a four-element computational model can be used to calculate the shear bearing capacity as well asthe difference between calculated and experimental values. The difference is less than 6.5%. The model can be used to predict the shear capacity of precast concrete two-way hollow slabs.