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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: Stress redistribution in evolutive cross-sections
Author(s): Iglesias, C.
Appears on pages(s): 57 - 76
Abstract:In this paper a well-known method of caltulating the self-stress state appearing in a section following Navier's Law is presented. The cross-section may be formed by concrete of different ages, prestressed and non-prestressed reinforcement and even by a section of steel. General formulae are deduced from equilibruim and compatibility requirementes at each layer's interface. For the analysis of the time-dependent changes, the consideration of a particular creep function is needed. Thus, simplified CEB-1990 Product Model is compared to the CEB-1970 one; and a particular case of cross-section fabricated in two parts within a time-interval of 100 days is studied. The use of simplified formulae and a single step of time, seems to be a quite good accurate approach as compared to the namely exact step-by-step calculation approach.
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