The connection between shear wall and floor slab is an essential link in the lateral load resisting mechanism of slab - wall systems. The performance of the connection can influence the pattern and distribution of lateral forces among the vertical elements of the structure. By modifying the joint detailing pattern, performance of the connection under lateral loading can be improved to a great extent. Even though the significance of the wall – slab connections in sustaining large deformations and forces during lateral loading is enormous, specific detailing guidelines are not explicitly established in the ACI codes.
The existing recommendation as per ACI 318 M-02 regarding the detailing of wall to slab joint is the provision of extended bars from the horizontal member onto the vertical member for a lap length equal to the development length of the bar. However, the joint performance can be enhanced by altering the ‘void joint core’ resulting from the aforesaid recommended provision. For this purpose, a novel ductile detailing with additional shear reinforcement in the joint core region has been proposed. This paper analyses some test results, relevant to three sub-assemblies’ units tested under static lateral reverse cyclic loads, to evaluate the effect of the proposed joint detailing on the behavior of shear wall to floor slab joint region. Successively, three-dimensional nonlinear finite element models of the wall- slab joint sub-assembly were developed and analyzed using ABAQUS/CAE software. The concrete damage plasticity model was used to model the inelastic behavior of the concrete material under cyclic loading. The models could predict the capacity and behavior of the joint sub-assemblies, with a reasonable level of overestimation.
The provision of reinforcement in the core region of wall-slab joint for the construction of shear wall structures has been proven to be effective from the measured and computed similar values under cyclic loading. The improvement in displacement ductility for the specimens with the proposed novel reinforcement detailing for wall- slab joint region ensures increased energy dissipation which is desired under lateral loading. This paper thus verifies the viability of using the proposed type of joint detailing system in construction.