Title:
Punching Shear Behavior of Lightweight Concrete Slabs and Shells
Author(s):
David I. Mclean, Long T. Phan, H. S. Lew, and Richard N. White
Publication:
Structural Journal
Volume:
87
Issue:
4
Appears on pages(s):
386-392
Keywords:
concrete slabs; lightweight concretes; offshore structures; one-way slabs; prestressed concrete; punching shear; reinforced concrete; reinforcing steels; shear strength; Structural Research
DOI:
10.14359/2735
Date:
7/1/1990
Abstract:
Summarizes 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. 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.