Comparison of main models for size effect on shear strength of reinforced and prestressed concrete beams

2016 ◽  
Vol 17 (5) ◽  
pp. 778-789 ◽  
Author(s):  
Qiang Yu ◽  
Jia-Liang Le ◽  
Mija H. Hubler ◽  
Roman Wendner ◽  
Gianluca Cusatis ◽  
...  
Keyword(s):  
Shear Strength ◽  
Size Effect ◽  
Prestressed Concrete ◽  
Concrete Beams

Flexural behaviour of reinforced or prestressed concrete beams including strengthening with prestressed carbon fibre reinforced polymer sheets: application of a fracture mechanics approach

2007 ◽  
Vol 34 (5) ◽  
pp. 664-677 ◽  
Author(s):  
Yail J Kim ◽  
Mark F Green ◽  
R Gordon Wight
Keyword(s):  
Fracture Mechanics ◽  
Size Effect ◽  
Carbon Fibre ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Mechanics Model ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

This paper describes the application of a fracture mechanics model (Hillerborg 1990) to concrete structures, including strengthening with prestressed carbon fibre reinforced polymer (CFRP) sheets. One benefit of the proposed fracture mechanics model, consisting of a unique combined stress–strain response of concrete, is that it includes the size effect of reinforced concrete beams; however, its application and validation have not been fully investigated. The proposed model is reviewed and further developed to cover prestressed concrete beams including a beam strengthened with a prestressed CFRP sheet. To evaluate the model, various approaches such as finite element analysis, a strength-based model, a conventional design method, and experimental results are compared with the fracture mechanics model. The size-dependent parameter (ε1) significantly affects the predicted behaviour of reinforced or prestressed concrete beams, depending on the contribution of reinforcement. Based on the current assessment, ε1 = 0.005 is recommended as an upper limit for normal strength concrete.Key words: carbon fibre reinforced polymer sheet, flexure, fracture mechanics, prestressed concrete beam, reinforced concrete beam, strengthening, size effect.

scholarly journals Size Effect in Flexure of Prestressed Concrete Beams Failing by Compression Softening

2014 ◽  
Vol 140 (10) ◽  
pp. 04014068 ◽  
Author(s):  
Jan Vorel ◽  
Mahendra Gattu ◽  
Zdeněk P. Bažant
Keyword(s):  
Size Effect ◽  
Prestressed Concrete ◽  
Concrete Beams
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