Research Article
Dec 1977
Stochastic Process for Extrapolating Concrete Creep
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VIEW THE REPLYPublication: Journal of the Engineering Mechanics Division
Volume 103, Issue 6
Abstract
Creep of concrete is modeled as a process with independent increments of locally gamma distribution. The process is transformed to a stationary gamma process. The mean prediction agrees with the deterministic double power law established previously. Infinite divisibility of the increment distribution is assumed. This is justified by additivity of deformations and of stresses, and also by considerations of the microscopic mechanism of creep, assuming creep to be due to migrations of widely spaced solid particles along micropore passages whose length is statistically distributed. The treatment of creep as a stochastic process allows extracting considerable information from measurements even on one specimen, although a greater number of specimens is preferable. The main use of the model is in extrapolation of short time creep data into long times, and calculation of confidence limits. Methods of determining process parameters from creep test data are given. Monte Carlo simulations demonstrate reasonable agreement with test data.
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Information
Published In
Journal of the Engineering Mechanics Division
Volume 103 • Issue 6 • December 1977
Pages: 1069 - 1088
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Dec 1977
Published online: Feb 3, 2021
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Authors
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Erhan Cinlar
Prof. of Applied Mathematics, Industrial Engrg., and Mathematics, Northwestern Univ., Evanston, Ill.
Zdeněk P. Bažant, M.ASCE
Prof. of Civ. Engrg., Northwestern Univ., Evanston, Ill.
ElMamoun Osman
Inst. of Civ. Engrg., Univ. of Petroleum and Minerals, Dhahran, Saudi Arabia; formerly, Orad. Research Asst., Northwestern Univ., Evanston, Ill.
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