TY - GEN
T1 - Possible cracking-localization effect on required minimum conventional reinforcement ratio in RC beams with steel fibers
AU - Karinski, Yuri S.
AU - Dancygier, Avraham N.
N1 - Publisher Copyright: © Federation Internationale du Beton (fib) - International Federation for Structural Concrete, 2019.
PY - 2019
Y1 - 2019
N2 - There is experimental evidence of 'cracking localization' that occurs in RC beams and tensile bars with steel fibers and with low amounts of conventional reinforcement. 'Cracking localization' has been observed under increased loads and it is characterized by a significant widening of only one or two cracks, compared with the opening of the other cracks. Consequently, there is an increase of the plastic strains of the rebars that bridge the wide cracks, even up to their rupture. This phenomenon is accompanied by a pronounced reduction in the flexural ductility of such beams, which impairs their structural response, compared with RC beams without fibers. Minimum longitudinal reinforcement ratio in RC beams is commonly determined by criteria that refer to their flexural capacity. Yet in view of the above-mentioned effect of the fibers on the development of cracking localization and reduced flexural ductility, it must also be considered for setting the requirements for minimum longitudinal reinforcement in RC beams with fibers. The paper presents an overview of the work that has been done so-far by the authors towards qualitative and quantitative understanding and consideration of the cracking localization phenomenon and of its possible effect on reduction of flexural ductility.
AB - There is experimental evidence of 'cracking localization' that occurs in RC beams and tensile bars with steel fibers and with low amounts of conventional reinforcement. 'Cracking localization' has been observed under increased loads and it is characterized by a significant widening of only one or two cracks, compared with the opening of the other cracks. Consequently, there is an increase of the plastic strains of the rebars that bridge the wide cracks, even up to their rupture. This phenomenon is accompanied by a pronounced reduction in the flexural ductility of such beams, which impairs their structural response, compared with RC beams without fibers. Minimum longitudinal reinforcement ratio in RC beams is commonly determined by criteria that refer to their flexural capacity. Yet in view of the above-mentioned effect of the fibers on the development of cracking localization and reduced flexural ductility, it must also be considered for setting the requirements for minimum longitudinal reinforcement in RC beams with fibers. The paper presents an overview of the work that has been done so-far by the authors towards qualitative and quantitative understanding and consideration of the cracking localization phenomenon and of its possible effect on reduction of flexural ductility.
KW - Cracking localization
KW - Fiber-reinforced concrete
KW - Structural ductility
UR - http://www.scopus.com/inward/record.url?scp=85066064915&partnerID=8YFLogxK
M3 - منشور من مؤتمر
T3 - Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
SP - 91
EP - 97
BT - Proceedings of the fib Symposium 2019
A2 - Derkowski, Wit
A2 - Krajewski, Piotr
A2 - Gwozdziewicz, Piotr
A2 - Pantak, Marek
A2 - Hojdys, Lukasz
T2 - fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
Y2 - 27 May 2019 through 29 May 2019
ER -