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Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 343842, 9 pages
http://dx.doi.org/10.1155/2013/343842
Research Article

XFEM for Thermal Crack of Massive Concrete

State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

Received 28 June 2013; Revised 2 September 2013; Accepted 2 September 2013

Academic Editor: Song Cen

Copyright © 2013 Guowei Liu 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

Thermal cracking of massive concrete structures occurs as a result of stresses caused by hydration in real environment conditions. The extended finite element method that combines thermal fields and creep is used in this study to analyze the thermal cracking of massive concrete structures. The temperature field is accurately simulated through an equivalent equation of heat conduction that considers the effect of a cooling pipe system. The time-dependent creep behavior of massive concrete is determined by the viscoelastic constitutive model with Prony series. Based on the degree of hydration, we consider the main properties related to cracking evolving with time. Numerical simulations of a real massive concrete structure are conducted. Results show that the developed method is efficient for numerical calculations of thermal cracks on massive concrete. Further analyses indicate that a cooling system and appropriate heat preservation measures can efficiently prevent the occurrence of thermal cracks.