Size and shape effect in the pull-out of FRP reinforcement from concrete

2016 ◽  
Vol 143 ◽  
pp. 395-417 ◽  
Author(s):  
Gaia Barbieri ◽  
Luigi Biolzi ◽  
Massimiliano Bocciarelli ◽  
Sara Cattaneo
Keyword(s):  
Shape Effect ◽  
Size And Shape ◽  
Pull Out ◽  
Frp Reinforcement

Influence of Test Configuration on Bond Strength of GFRP Bars

2019 ◽  
Vol 292 ◽  
pp. 217-223 ◽  
Author(s):  
Ondřej Janus ◽  
Frantisek Girgle ◽  
Vojtech Kostiha ◽  
Petr Štěpánek ◽  
Pavel Sulak
Keyword(s):  
Bond Strength ◽  
Concrete Cover ◽  
Silica Sand ◽  
Beam Test ◽  
Bond Behaviour ◽  
Test Configuration ◽  
Gfrp Bars ◽  
Pull Out ◽  
Frp Reinforcement ◽  
Gfrp Reinforcement

It is well-known that test configuration affects bond behaviour of steel reinforcement, but this effect has not yet been sufficiently quantified when using FRP reinforcement. This paper presents partial results from an ongoing experimental programme that deals with the bond strength of GFRP bars with concrete, with regards to the effect of the surface treatment of the rebars and test configuration. A modified beam test is presented in this study along with a pull-out test with an eccentric bar placement. The bond strength of GFRP reinforcement with sand-coated treatment using silica sand and ribbed type with milled ribs was tested. The sand-coated bars exhibit different bond behaviour compared to the ribbed ones due to different forces transfer from the reinforcement to the concrete. Thickness of the concrete cover layer also has a significant effect on the bond behaviour of the reinforcement.

scholarly journals Characterization and Simulation of the Bond Response of NSM FRP Reinforcement in Concrete

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1770 ◽  
Author(s):  
Javier Gómez ◽  
Lluís Torres ◽  
Cristina Barris
Keyword(s):  
Load Capacity ◽  
Numerical Procedure ◽  
Fiber Reinforced Polymer ◽  
Near Surface ◽  
Bond Slip ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Frp Reinforcement ◽  
Near Surface Mounted ◽  
Shear Stress And Strain

The near-surface mounted (NSM) technique with fiber reinforced polymer (FRP) reinforcement as strengthening system for concrete structures has been broadly studied during the last years. The efficiency of the NSM FRP-to-concrete joint highly depends on the bond between both materials, which is characterized by a local bond–slip law. This paper studies the effect of the shape of the local bond–slip law and its parameters on the global response of the NSM FRP joint in terms of load capacity, effective bond length, slip, shear stress, and strain distribution along the bonded length, which are essential parameters on the strengthening design. A numerical procedure based on the finite difference method to solve the governing equations of the FRP-to-concrete joint is developed. Pull-out single shear specimens are tested in order to experimentally validate the numerical results. Finally, a parametric study is performed. The effect of the bond–shear strength slip at the bond strength, maximum slip, and friction branch on the parameters previously described is presented and discussed.

Size and Shape Effect on the Magnetic Properties of α-Fe2O3 Nanoparticles

1998 ◽  
Vol 269-272 ◽  
pp. 937-942 ◽  
Author(s):  
L. Suber ◽  
R. Zysler ◽  
A. GarcÍa Santiago ◽  
Dino Fiorani ◽  
M. Angiolini ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Shape Effect ◽  
Size And Shape

Size and Shape Effect of SiC Source/Drain on Strained Si

2014 ◽  
Vol 14 (10) ◽  
pp. 7679-7682 ◽  
Author(s):  
D.-S. Byeon ◽  
S.-W. Kim ◽  
D.-H. Ko
Keyword(s):  
Shape Effect ◽  
Strained Si ◽  
Size And Shape

Bond Behavior of FRP Bars in Concrete

2018 ◽  
Vol 272 ◽  
pp. 3-8 ◽  
Author(s):  
Ondřej Janus ◽  
Frantisek Girgle ◽  
Vojtech Kostiha ◽  
Petr Štěpánek
Keyword(s):  
Surface Treatment ◽  
Concrete Cover ◽  
Experimental Program ◽  
Direct Influence ◽  
Test Configuration ◽  
Bond Behavior ◽  
Pull Out ◽  
Frp Reinforcement ◽  
Cover Thickness ◽  
Frp Bars

This article deals with the bond of internal composite (FRP) reinforcement with different surface treatments. Bars with additional sand-coating exhibit different behavior due to different transmission of forces in relation to bars with ribbed surface. To compare the bond behavior of these types of reinforcement, an experimental program consisting of several sets of pull-out tests was designed. This test configuration was chosen primarily for simplicity, comparability with previously published results, and especially easy modification for assessment the effect of concrete cover thickness. The paper presents the results confirming the direct influence of the surface treatment and also the position of the reinforcement on the resulting bond behavior.

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