Simplified Optimum Design Procedure for Special Unbonded Posttensioned Split Precast Shear Walls

AbstractIn this paper, a set of simplified design equations for an unbonded posttensioned (PT) precast split hybrid shear wall system is developed. Such a system was proposed by the Precast Seismic Structural Systems (PRESSS) and can be used as a bearing wall or a special reinforced concrete wall for building frames, as defined in ASCE/SEI 7, for eliminating residual drift after seismic events. The panels are anchored to the foundation with unbonded PT tendons located at the panel center; adjacent panels are connected with uniformly distributed energy dissipating coupling devices. An iterative design procedure to calculate the required area of the PT reinforcement and the total yield force of all shear connectors in one vertical joint was proposed by PRESSS. This iterative procedure is exact, but tedious and lengthy. A simpler nondimensional chart-based design procedure was proposed by the writers. This procedure is efficient, but has limitations. A noniterative procedure adopted by ACI ITG-5.2, although ...