Abstract:
Previous research has shown that rocking or self-centering precast concrete walls provides superior seismic resistance when compared to traditional concrete construction. However, uplift at the base of the wall causes a vertical displacement incompatibility between the wall and floor diaphragms. The type of wall-to-floor connection and the floor diaphragm’s resistance to wall uplift can have a significant influence on the seismic behaviour of both the wall and the building. Finite element modelling indicated that the lateral strength of a building is significantly increased when the floor diaphragms are rigidly restrained to the rocking wall. Additionally, reparable damage is caused to the floor slab when a cast-in-place connection is detailed. An alternative to a rigid cast-in-place connection is to use a wall-to-floor connection that will isolate the floor from the vertical displacement and rotation of the wall, preventing any significant floor damage. The influence of the wall-to-floor interaction on the seismic response of a building is not limited to rocking walls, and has the potential to be more severe for traditional reinforced concrete walls, increasing the vulnerability of the wall to shear or axial failure.
