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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: Column Strength of Long Piles
Author(s): J. J. Hromadik
Publication: Journal Proceedings
Appears on pages(s): 757-778
Abstract:Results of full-scale column tests on 80 ft long concrete piles (nominally 60 ft unsupported length), concentrically loaded, are presented. Included are 32 tests of 12 sepa-rate concrete specimens (three each of four different types); test data on three steel bearing piles are also given for comparison. The test results on the concrete specimens are compared to theoretically predicted buckling loads determined by employing Engesser’s tangent modulus in the generalized Euler equation and using test determined effective lengths. The application of the tangent modulus principles is in accordance with the works of others, who utilized Hognestad's idealized stress-strain relation for concrete. The analyses indicate that there is no evidence of a significant difference between the theoretical predictions and the test results.
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