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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 623215, 8 pages
http://dx.doi.org/10.1155/2015/623215
Research Article

The Study on Cracking Strength of AIJs to Release the Early-Age Stress of Mass Concrete

1Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China
2Department of Materials and Structural Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China
3Department of Building Materials, Chalmers University of Technology, 41296 Gothenburg, Sweden
4China Ming Yang Wind Power Group Limited, Zhongshan 528437, China

Received 18 April 2015; Revised 30 August 2015; Accepted 31 August 2015

Academic Editor: Hossein Moayedi

Copyright © 2015 Xiaogang Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper aims to theoretically and numerically assess the effect of setting artificial-induced joints (AIJs) during construction period of a mass concrete structure to release the early-stage thermal stress. With respect to the coupling influences of various factors such as size and boundary of AIJs, an analytical model for its cracking strength on the setting section of mass concrete is proposed based on double-parameter fracture theory. A kind of hyper-finite element analysis (FEA) for many array AIJs in simplified plane pate is also presented by using bilinear cohesive force distribution. The results from the present model and numerical simulation were compared to those of experimental data to prove the efficiency and accuracy of the analytical model and FEA. The model presented in this study for the cracking strength of AIJs provides a simple useful tool to accurately evaluate how many early stress AIJs reduced. The theoretical solution and FEA results could also be significantly contributed to find the “just” and “perfect” release of the temperature stress and to improve the design level of AIJs in mass concrete structure.