A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Concrete fracture models: testing and practice
The existing fracture models for concrete and the testing methods for fracture energy and other fracture characteristics are reviewed and some new results on the relationship between fracture testing and size effect are presented. The limitations of the cohesive crack model are discussed. The discrepancy between the fracture energy values measured by Hillerborg's work-of-fracture method and the size effect method is explained and mathematically described by the recently proposed broad-range size effect law. The implications of the large statistical scatter of the fracture energy values measured by the work of fracture, compared to those measured by the size effect method or Jenq-Shah method, are discussed. A testing procedure in which the maximum loads of notched beams of only two different sizes in the ratio 2:1 and two different notch depths are tested is proposed and a least-square procedure for calculating the fracture parameters is given. A simplified testing procedure with an empirical coefficient, in which only the maximum loads of identical notched and unnotched beams of one size are tested, is also proposed as an alternative. The small-size asymptotics of the cohesive crack model is determined and a formula matching this asymptotics, as well as the large-size linear elastic fracture mechanics asymptotics, is presented. Various arguments for introducing fracture mechanics into concrete design practice are reviewed and put into the perspective of safety factors.
Concrete fracture models: testing and practice
The existing fracture models for concrete and the testing methods for fracture energy and other fracture characteristics are reviewed and some new results on the relationship between fracture testing and size effect are presented. The limitations of the cohesive crack model are discussed. The discrepancy between the fracture energy values measured by Hillerborg's work-of-fracture method and the size effect method is explained and mathematically described by the recently proposed broad-range size effect law. The implications of the large statistical scatter of the fracture energy values measured by the work of fracture, compared to those measured by the size effect method or Jenq-Shah method, are discussed. A testing procedure in which the maximum loads of notched beams of only two different sizes in the ratio 2:1 and two different notch depths are tested is proposed and a least-square procedure for calculating the fracture parameters is given. A simplified testing procedure with an empirical coefficient, in which only the maximum loads of identical notched and unnotched beams of one size are tested, is also proposed as an alternative. The small-size asymptotics of the cohesive crack model is determined and a formula matching this asymptotics, as well as the large-size linear elastic fracture mechanics asymptotics, is presented. Various arguments for introducing fracture mechanics into concrete design practice are reviewed and put into the perspective of safety factors.
Concrete fracture models: testing and practice
Bruchmodelle für Beton: Prüfung und Praxis
Bazant, Z.P. (author)
Engineering Fracture Mechanics ; 69 ; 165-205
2002
41 Seiten, 16 Bilder, 109 Quellen
Article (Journal)
English
Concrete fracture models: testing and practice
| British Library Online Contents | 2002
Concrete fracture models and applications
| TIBKAT | 2011
Comparisons of Concrete Fracture Models
| Online Contents | 1997
A Research on concrete fracture mechanics: testing and analyzing the fracture energy of concrete
| BASE | 2016
Embedded crack models for concrete fracture
| British Library Conference Proceedings | 1998