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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Comparison of Analytical with Experimental Internal Strain Distribution for the Pullout Test
Author(s): William C. Stone and Nicholas J. Carino
Publication: Journal Proceedings
Appears on pages(s): 3-12
Keywords: concretes; cracking (fracturing); finite element method; nondestructive tests; pullout tests; strength; stress analysis.
Abstract:Axisymmetric, two-dimensional, linear-elastic finite element solutions for the internal strain distribution of the pullout test were compared with experimental data from two large-scale tests. Good agreement was found between experimental and analytical strains up to the load which caused first cracking in the laboratory specimens. Within the un-cracked stress region where the fracture surface develops, state is triaxial tension-tension-compression. Tensile stresses are directed in the circumferential and the radial directions, while the compressive stresses are dircted parallel to a line from the pullout insert disk to the reaction ring. For a 70 deg apex angle, the principal compressive stress trajectories were nearly parallel to the measured failure surface in the physical test. This behavior suggests that the stresses formation which are of the failure surface is dominated by the tensile present. Because of the complex state of stress during the test, it is unlikely that pullout strength is directly related to compressive strength. It is proposed that the good correlation comes about because both the pullout strength and the compressive strength of concrete are related primarily to the tensile strength the mortar.
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