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Numerical analysis of multiple cracks in concrete based on the discrete modelling approach
The discrete crack approach, which has been extensively used for analyzing single cracks, is extended for numerical analysis of multiple cracks, based on the fictitious crack model and the crack-tip-controlled numerical algorithm. Assuming each crack as an effective crack while restraining the growth of others in turn, an explicit formulation of the mode I-type crack propagation for multiple cracks is presented, and a minimum load criterion for crack extension is proposed for its numerical implementation. By eliminating invalid solutions to ensure proper crack behaviour, this numerical model is capable of producing a variety of crack propagation patterns. The accuracy and effectiveness of this numerical method in analyzing multiple-crack problems are demonstrated through experimental verifications with fracture tests on real size tunnel specimens. Although numerical analysis of multiple cracks using the discrete approach is deemed difficult, the proposed method presents a systematic solution to the problem, based on simple and clear principles of the fracture mechanics in concrete. The accuracy of the model is demonstrated through solving a structural problem containing multiple cracks, i.e., the fracture tests of a real-size tunnel specimen. Comparisons are made between the numerical analyses and the experimental results, with an emphasis given to the load-displacement relations and the crack propagation patterns. The agreement between the two results is found to be excellent.
Numerical analysis of multiple cracks in concrete based on the discrete modelling approach
The discrete crack approach, which has been extensively used for analyzing single cracks, is extended for numerical analysis of multiple cracks, based on the fictitious crack model and the crack-tip-controlled numerical algorithm. Assuming each crack as an effective crack while restraining the growth of others in turn, an explicit formulation of the mode I-type crack propagation for multiple cracks is presented, and a minimum load criterion for crack extension is proposed for its numerical implementation. By eliminating invalid solutions to ensure proper crack behaviour, this numerical model is capable of producing a variety of crack propagation patterns. The accuracy and effectiveness of this numerical method in analyzing multiple-crack problems are demonstrated through experimental verifications with fracture tests on real size tunnel specimens. Although numerical analysis of multiple cracks using the discrete approach is deemed difficult, the proposed method presents a systematic solution to the problem, based on simple and clear principles of the fracture mechanics in concrete. The accuracy of the model is demonstrated through solving a structural problem containing multiple cracks, i.e., the fracture tests of a real-size tunnel specimen. Comparisons are made between the numerical analyses and the experimental results, with an emphasis given to the load-displacement relations and the crack propagation patterns. The agreement between the two results is found to be excellent.
Numerical analysis of multiple cracks in concrete based on the discrete modelling approach
Numerische Analyse von Mehrfachrissen in Beton mittels Näherung durch diskreter Modellierung
Shi, Z. (Autor:in) / Suzuki, M. (Autor:in) / Ohtsu, M. (Autor:in) / Hibino, Y. (Autor:in)
2001
9 Seiten, 7 Bilder, 7 Quellen
(Nicht paginiert).
Aufsatz (Konferenz)
Englisch
Numerical Analysis of Multiple Cracks in Concrete Using the Discrete Approach
| Online Contents | 2001
Numerical Analysis of Multiple Cracks in Concrete Using the Discrete Approach
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