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Computers and Concrete Volume 9, Number 1, January 2012 , pages 1-19 DOI: https://doi.org/10.12989/cac.2012.9.1.001 |
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Size-effect of fracture parameters for crack propagation in concrete: a comparative study |
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Shailendra Kumar and S.V. Barai
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| Abstract | ||
| The size-effect study of various fracture parameters obtained from two parameter fracture model, effective crack model, double-K fracture model and double-G fracture model is presented in the paper. Fictitious crack model (FCM) for three-point bend test geometry for cracked concrete beam of laboratory size range 100-400 mm is developed and the different fracture parameters from size effect model, effective crack model, double-K fracture model and double-G fracture model are evaluated using the input data obtained from FCM. In addition, the fracture parameters of two parameter fracture model are obtained using the mathematical coefficients available in literature. From the study it is concluded that the fracture parameters obtained from various nonlinear fracture models including the double-K and double-G fracture models are influenced by the specimen size. These fracture parameters maintain some definite interrelationship depending upon the specimen size and relative size of initial notch length. | ||
| Key Words | ||
| concrete fracture; fracture process zone; cohesive stress distribution; nonlinear fracture models; size-effect; three-point bending test. | ||
| Address | ||
| Shailendra Kumar: Department of Civil Engineering, National Institute of Technology, Jamshedpur-831 014, India; Department of Civil Engineering, Indian Institute of Technology, Kharagpur-721 302, India S.V. Barai: Department of Civil Engineering, Indian Institute of Technology, Kharagpur-721 302, India | ||