Size Effect of Shear Failure in Prestressed Concrete Beams

1986 ◽  
Vol 83 (2) ◽  
Keyword(s):  
Size Effect ◽  
Prestressed Concrete ◽  
Shear Failure ◽  
Concrete Beams

scholarly journals Reliability assessment of the behavior of reinforced and/or prestressed concrete beams sections in shear failure

2021 ◽  
Vol 15 (57) ◽  
pp. 195-222
Author(s):  
Karim Benyahi ◽  
Mohand Said Kachi ◽  
Youcef Bouafia ◽  
Salma Barboura ◽  
Jia Li
Keyword(s):  
Prestressed Concrete ◽  
Shear Failure ◽  
Concrete Beams ◽  
Limit State ◽  
Shear Loading ◽  
The Real ◽  
Modeling Uncertainties ◽  
Reliability Method ◽  
Real Behavior ◽  
State Curve

The object of this article is to be able to simulate the behavior of reinforced and/or prestressed concrete beam’s section in the shear loading through a model allowing the evaluation of nonlinear strains caused by shear, while taking into account the real behavior of the materials. In this approach, we are often confronted with problems of modeling uncertainties linked to some insufficiencies of the mechanical model allowing to describe the physical phenomena in a realistic way. For that, it is necessary to use a reliability model making it possible to evaluate their probability of failure, by establishing failure curves according to the different transition zones of the limit state curve of the nonlinear behavior in the shear loading up to at section failure of reinforced and/or prestressed concrete beams. In this work, we also propose a coupling of the reliability method by response surface to carry out the reliability optimization on complex mechanical models, where the mechanical and reliability models developed have been implemented on the Fortran. This allows the estimation in an efficient way of the different reliability characteristics according to each transition zone from the limit state curve to the real behavior until failure in the shear loading.

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

Shear Behavior of CFRP Prestressed Concrete Beams without Stirrups

2011 ◽  
Vol 266 ◽  
pp. 126-129 ◽  
Author(s):  
Zuo Hu Wang ◽  
Xiu Li Du ◽  
Jing Bo Liu
Keyword(s):  
Prestressed Concrete ◽  
Failure Modes ◽  
Shear Failure ◽  
Concrete Beams ◽  
Shear Behavior ◽  
Shear Capacity ◽  
Shear Span ◽  
Compression Failure ◽  
Concrete Members ◽  
Prestressed Beams

Five beams were tested up to failure to study the shear behavior of concrete beams prestressed with fiber reinforced polymer (FRP). Different factors were taken into consideration: the type of prestressing tendons and the shear span ratio. The shear failure modes and the influence of different factors on shear behavior were investigated in details. The test results showed that FRP prestressed beams without stirrups had two shear failure modes: diagonal compression failure and shear compression failure; the shear span ratio was the most important factor to determine the failure mode and shear capacity of the prestressed beams. The shear capacity of concrete members prestressed with FRP tendons was lower than that of concrete beams prestressed with steel cables.

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
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