- Author
- McLean, D. I. | Phan, L. T. | Lew, H. S. | White, R. N.
- Title
- Punching Shear Behavior of Lightweight Concrete Slabs and Shells.
- Coporate
- National Institute of Standards and Technology, Gaithersburg. MD
- Journal
- ACI Structural Journal, Vol. 87, No. 4, 386-392, July/August 1990
- Keywords
- concrete slabs | lightweight concretes | offshore structures | one-way slabs | prestressed concretes | punching shear | reinforced concretes | reinforcing steels | shear strength | shells (structural forms) | walls
- Abstract
- Results of an experimental investigation of the punching shear strength of reinforced and prestressed lightweight concrete slabs and shells representative of the exterior walls of offshore structures are summarized. Eight continuous slabs, one single-span slab, and six single-span shells were tested. The main variables investigated were amount of shear reinforcement, shell curvature, prestressing, span continuity condition, and size of loaded area. The punching shear strengths observed were much higher than those predicted by the 1983 ACI Building Code (ACI 318-83), particularly in the specimens with shear reinforcement and curvature. The higher strengths were primarily a result of the following: the relatively small span-to-thickness ratios of the specimens; superior performance of the headed shear reinforcing bars used in the study when compared to conventional stirrups; and the presence of arch action produced by shell curvature.