Design of Post-Tensioned Floor Slabs


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Title: Design of Post-Tensioned Floor Slabs

Author(s): Bijan O. Aalami

Publication: Concrete International

Volume: 11

Issue: 6

Appears on pages(s): 59-67

Keywords: concrete slabs; deflection; flat concrete plates; punching shear; flat concrete slabs; floors; partial prestressing; post-tensioning; stresses; structural design; shear properties; unbonded prestressing; waffle slabs; Design

Date: 6/1/1989

A consistently increasing proportion of concrete floor slab systems in the U.S. is being designed and constructed using unbonded post-tensioning. In California, post-tensioned floor slabs are the primary choice in concrete floor construction. An overview is presented on the application and design of such floor systems, and the commonly selected cast-in-place floor system configurations are described. Limitations on slab dimensions and required material quantities are presented and discussed. Additionally, questions encountered in everyday design practice, such as structural modeling assumptions, placement of post-tensioning and reinforcement, one-way and two-way systems, and punching shear are introduced and clarified.