Title:
Shear Design of Concrete Offshore Structures
Author(s):
Perry Adebar and Michael P. Collins
Publication:
Structural Journal
Volume:
91
Issue:
3
Appears on pages(s):
324-335
Keywords:
cracking (fracturing); crack width and spacing; offshore structures; plates (structural members); reinforced concrete; shear strength; structural design; tension; tests; triaxial loads; Design
DOI:
10.14359/4371
Date:
5/1/1994
Abstract:
Presents a strain compatibility procedure for the design of complex concrete structures subjected to combined membrane shear and transverse shear. The procedure, which is a three-dimensional generalization of the modified compression field theory, accounts for triaxial (compressive and tensile) stresses in concrete between cracks and shear stresses on the crack surface. The method can be described as a three-dimensional variable angle truss model with a rational concrete contribution (V c), where the inclination of the truss is determined by strain compatibility, and the concrete contribution is the shear that can be transmitted across diagonal cracks by aggregate interlock. Nine large-scale experiments in which elements of a concrete offshore structure wall were subjected to combined membrane shear and transverse shear are presented. The equivalent beam approach, which is presently used to design concrete offshore structures, is not able to predict the experimental trend because it makes use of the traditional beam shear design equations, which are inaccurate when significant axial load is present, and also because it does not properly account for the orientation of the in-plane reinforcement. The three-dimensional modified compression field approach presented in this paper accurately predicts the influence of membrane shear on transverse shear and, thus, is a more appropriate shear design method for complex concrete structures.