RESEARCH ARTICLE


Study on the Model of Creep and the Calculation of Stress Field for Concrete



Guo Lei*, 1, Yang Zi Sheng2
1 College of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
2 Zhongyuan University of Technology, Zhengzhou 450000, China


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Creative Commons License
© 2015 Lei and Sheng;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the College of Water Conservancy, North China University of Water Resources and Electric Power. Zhengzhou 450045, China; Tel: +8613525587730; E-mail: glboss@126.com


Abstract

The exact prediction of creep is of great significance for the simulation of the stress field of concrete creep. To overcome the limitation of the current prediction model of creep, pertinent models abroad are referred and adopted so that other factors can be controlled under standard state but only the creep varies to evaluate the feasibility of the prediction model with current characteristic of concrete materials and available test data. In the prediction of creep of high performance concrete, any influencing factor can be quantified, therefore, a large number of test data are not required. It was also observed that the defects that factors pointed out were common in the prediction model of concrete. The calculation was simple and convenient and achieved a higher accuracy. In the calculation of creep stress field, the creep was calculated according to fitting creep degree. Based on this, this paper established the creep coefficient formulas for the calculation of strain increment, and deduced the number of finite element expressions which were used to calculate the creep stress field with creep coefficient.

Keywords: Creep coefficient, high-performance concrete, nonstandard state, prediction model, standard state.