Flexural strengthening of RC beams with externally bonded CFRP plate: experimental study on shear-peeling debonding

2016 ◽  
Vol 68 (14) ◽  
pp. 724-738 ◽  
Author(s):  
Wei Zhang ◽  
Toshiyuki Kanakubo
Keyword(s):  
Experimental Study ◽  
Rc Beams ◽  
Flexural Strengthening ◽  
Cfrp Plate ◽  
Externally Bonded

STRENGTHENING OF RC BEAMS USING NEAR SURFACE EMBEDDED-FRCM

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Usama Ebead ◽  
Hossameldin El-Sherif
Keyword(s):  
Experimental Evidence ◽  
Masonry Structures ◽  
Rc Beams ◽  
Near Surface ◽  
Flexural Strengthening ◽  
Reinforced Beams ◽  
Concrete Layer ◽  
Test Parameters ◽  
Externally Bonded ◽  
Strengthening Technique

Fibre reinforced cementitious matrix (FRCM) systems are mostly externally bonded (EB) for the strengthening of reinforced concrete (RC) and masonry structures. In this paper, the relatively new concept of near-surface embedded (NSE) FRCM, has been introduced for the flexural strengthening of beams. The process of the application of NSE-FRCM strengthening technique involves the removal of the concrete layer at beam soffit, being the most deteriorated in actual practices. Experimental evidence of the flexural strengthening efficacy of this technique is provided here. Eight RC beams were prepared and tested under four-point loading with the consideration of two test parameters: (a) FRCM material (polyparaphenylene benzobisoxazole (PBO)/carbon/ glass); and (b) the reinforcement ratio (0.5% representing flexure-deficient beams and 1.28% representing typical under-reinforced beams). The strengthening led to gains in ultimate loads that ranged between 31.4% and 84.3%.

scholarly journals Combined Flexural and Shear Strengthening of RC T-Beams with FRP and TRM: Experimental Study and Parametric Finite Element Analyses

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 520
Author(s):  
Daniel A. Pohoryles ◽  
Jose Melo ◽  
Tiziana Rossetto
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Shear Capacity ◽  
Fe Model ◽  
Rc Beams ◽  
Shear Strengthening ◽  
Flexural Strengthening ◽  
Existing Structures ◽  
The Difference ◽  
Reinforcement Design

Due to inadequacies of reinforcement design in older structures and changes in building codes, but also the change of building use in existing structures, reinforced concrete (RC) beams often require upgrading during building renovation. The combined shear and flexural strengthening with composite materials, fibre-reinforced polymer sheets (FRP) and textile reinforced mortars (TRM), is assessed in this study. An experimental campaign on twelve half-scale retrofitted RC beams is presented, looking at various parameters of interest, including the effect of the steel reinforcement ratio on the retrofit effectiveness, the amount of composite material used for strengthening and the effect of the shear span, as well as the difference in effectiveness of FRP and TRM in strengthening RC beams. Significant effects on the shear capacity of composite retrofitted beams are observed for all studied parameters. The experimental study is used as a basis for developing a detailed finite element (FE) model for RC beams strengthened with FRP. The results of the FE model are compared to the experimental results and used to design a parametric study to further study the effect of the investigated parameters on the retrofit effectiveness.

Interfacial stresses in damaged RC beams strengthened with externally bonded CFRP plate

2006 ◽  
Vol 432 (1-2) ◽  
pp. 12-19 ◽  
Author(s):  
K.H. Benrahou ◽  
E.A. Adda bedia ◽  
S. Benyoucef ◽  
A. Tounsi ◽  
M. Benguediab
Keyword(s):  
Rc Beams ◽  
Interfacial Stresses ◽  
Cfrp Plate ◽  
Externally Bonded

Experimental Study of Strengthening of Reinforced Concrete Beams with Externally Bonded GFRP Sheets

2014 ◽  
Vol 919-921 ◽  
pp. 115-118
Author(s):  
Hai Ying Hu ◽  
Yu Cheng Zhang ◽  
Zhong Ming Huang
Keyword(s):  
Experimental Study ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Strengthening Effect ◽  
Rc Beams ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Bending Resistance ◽  
Externally Bonded ◽  
Fiber Reinforced Plastics

A test of bending resistance and reinforcement is carried out on RC beams by applying sheet of glass fiber reinforced plastics (GFRP). A study and analysis is given to the traits of bending and rupture of RC beams reinforced by applying GFRP and to the effect of GFRP on ultimate bearing capacity and stiffness of the beams. The strengthening effect is investigated to give guidance in practice work.

Experimental Study on Flexural Behavior of Damaged RC Beams Strengthened with Prestressed CFRP Plate

2011 ◽  
Vol 250-253 ◽  
pp. 2263-2270
Author(s):  
Rui Zhou ◽  
Mei Zhen Zhang ◽  
Zhou Hong Zong
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Flexural Behavior ◽  
Finite Element Models ◽  
Rc Beams ◽  
Cfrp Plate ◽  
Sustained Loading ◽  
The Finite Element Model

Strengthening using prestressed CFRP plate is a new developed technology in recent years, which can significantly improve the flexural behavior of reinforced concrete (RC) beams. In this paper, an experimental study including four RC beams stengthened with CFRP plates using self-developed anchorage system was carried out. The nonlinear finite element models of the strengthened beams were constructed to simulate the influence of flexural behavior on RC beams strengthened with CFRP plates under different damage degrees. The experimental results indicated that initial damage degrees have greatly influence on the crack distribution and ductility, deflection and the ultimate flexural strength of the strengthened beams, as well as steel reinforcement strain and CFRP plate strain. Meanwhile, the finite element model can predict accurately performances of strengthened RC beams before CFRP debonding. In addition, the numerical analysis indicated that the sustained loading while strengthening RC beam using prestressed CFRP plates would induce adverse effect, so the live loading should be removed before starting the strengthening works.

An experimental study on the effectiveness of externally bonded corrugated GFRP laminates for flexural cracks of RC beams

2017 ◽  
Vol 136 ◽  
pp. 348-360 ◽  
Author(s):  
N. Aravind ◽  
Amiya K. Samanta ◽  
Joseph V. Thanikal ◽  
Dilip Kr. Singha Roy
Keyword(s):  
Experimental Study ◽  
Rc Beams ◽  
Externally Bonded

Experimental Study of Strengthening of Reinforced Concrete Beams with Externally Bonded GFRP Sheets

2013 ◽  
Vol 790 ◽  
pp. 333-336
Author(s):  
Hui Kang Liu ◽  
Ze Fan ◽  
Yu Cheng Zhang
Keyword(s):  
Experimental Study ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Strengthening Effect ◽  
Rc Beams ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Bending Resistance ◽  
Externally Bonded ◽  
Fiber Reinforced Plastics

A test of bending resistance and reinforcement is carried out on RC beams reinforced by applying sheet of glass fiber reinforced plastics (GFRP). A study and analysis is given to the traits of bending and rupture of RC beams reinforced by applying GFRP and to the effect of GFRP on ultimate bearing capacity and stiffness of the beams. The strengthening effect is investigated to give guidance in practice work.

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