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Effect of bond enhancement using carbon nanotubes on flexural behavior of rc beams strengthened with externally bonded CFRP sheets

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Frontiers of Structural and Civil Engineering 2022年第1期16卷 131-143页

作者： Mohammad R.IRSHIDAT Rami S.AL-HUSBAN Department of Civil Engineering Jordan University of Science and TechnologyIrbid 22110Jordan

This paper studied the effect of incorporation of carbon nanotubes(CNTs)in carbon fiber reinforced polymer(CFRP)on strengthening of reinforced concrete(rc)beams.The rc beams were prepared,strengthened in flexure by externally bonded CFRP or CNTs-modified CFRP sheets,and tested under four-point loading.The experimental results showed the ability of the CNTs to delay the initiation of the cracks and to enhance the flexural capacity of the beams strengthened with CFRP.A nonlinear finite element(FE)model was built,validated,and used to study the effect of various parameters on the strengthening efficiency of CNTs-modified CFRP.The studied parameters included concrete strength,flexural reinforcement ratio,and CFRP sheet configuration.The numerical results showed that utilization of CNTs in CFRP production improved the flexural capacity of the strengthened beams for U-shape and underside-strip configurations.The enhancement was more pronounced in the case of U-shape than in the case of use of sheet strip covers on the underside of the beam.In case of using underside-strip,the longer or the wider the sheet,the higher was the flexural capacity of the beams.The flexural enhancement of rc beams by strengthening with CNTs-modified CFRP decreased with increasing the rebar diameter and was not affected by concrete strength.

关键词： rc beams flexural strengthening CFRP CNTs finite element

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ANALYTICAL ANALYSIS OF INTERFACIAL STRESSES IN FRP-rc HYBRID beams WITH TIME-DEPENDENT DEFORMATIONS OF rc BEAM

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Acta Mechanica Solida Sinica 2011年第6期24卷 519-526页

作者： Bouazza Fahsi Kouider Halim Benrahou Baghdad Krour Abdeloauhed Tounsi Samir Benyoucef1 E Abbas Adda Bedia Laboratoire des Matériaux et Hydrologie Université de Sidi Bel Abbes BP 89 Cité Ben M'hidi 22000 SidiBel Abbes Algéri Universitaire Mustapha Stambouli Mascara Département de Génie Civil Algérie Laboratoire des Matériaux et Hydrologie Université de Sidi Bel Abbes BP 89 Cité Ben M’hidi 22000 SidiBel Abbes Algérie

In this paper, the effect of time-dependent deformations （such as shrinkage and creep） on the interracial stresses between an rc beam and FRP plate is presented. For this end, a closed-form solution for such stresses in externally FRP plated rc beams including creep and shrinkage effects is presented. The developed model is formulated to predict the interfacial stresses at time ＇t＇, in which the rc beams have been already subjected to creep and shrinkage effects. The adherend shear deformations have been included in the present theoretical analysis by assuming a parabolic shear stress through the thickness of the rc beam and the FRP panel. Contrary to some existing studies, the assumption that both rc beam and FRP panel have the same curvature is not used in the present investigation. This research is helpful for the understanding on mechanical behavior of the interface and design of the FRP-rc hybrid structures.

关键词： hybrid structure rc beams FRP composites interfacial stresses creep shrinkage

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Experimental Study of rc beams Strengthened with CFRP Sheets Under Sustaining Loads

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Journal of Wuhan University of Technology(Materials Science) 2006年第3期21卷 82-85页

作者：王文炜 Transportation College Southeast UniversityNanjing 210096China

Seven reinforced concrete （ rc ） beams strengthened in flexure using carbon fiber reinforced polymer （CFRP） sheets subjected to different sustaining loads were tested. The effects of initial load and load history on the ultimate strength of strengthened rc beams were examined by externally bonded CFRP sheets. The main experimental parameters included different levels of sustaining load at the time of strengthening, and load history. Experimental results show that sustaining load levels at the time of strengthening have important influences on the ultimate strength of strengthened rc beams. If the initial load is the same, the ultimate strength of rc beams strengthened with CFRP sheets is almost the same regardless of load history at the time of strengthening.

关键词： CFRP rc beams sustaining load experimental study

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PREDICTION OF DEBONDING FAILURE IN FRP STRENGTHENED rc beams

PREDICTION OF DEBONDING FAILURE IN FRP STRENGTHENED RC BEAMS

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The International Symposium on Innovation & Sustainability of Structures in Civil Engineering

作者： Jianwu Pan Shuangyin Cao Department of Civil Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 China College of Civil Engineering Southeast University Nanjing 210096 China

＜正＞The Performance of FRP strengthened rc beams may always be compromised by debonding failure. Concrete cover debonding （CCD） and Intermediate flexural crack-induced debonding （IFCD） are the two most common debonding failure modes in FRP strengthened rc beams. Based on fracture theory a new prediction model of CCD is presented. The FRP strain at CCD failure only relates to these factors: mode I fracture energy of concrete, ratio of beam width and FRP width, thickness and elastic modulus of FRP, anchorage length of FRP, crack spacing of the strengthened beam. A new prediction model of IFCD is also presented with the influences of restraint stress and crack spacing on debonding load taken into account. The two models are then calibrated with test data from literatures and found outperform other existing models.

关键词： FRP rc beams strengthening concrete cover debonding （CCD） Intermediate flexural crack-induced debonding （IFCD）.

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Shear Strengthening of Reinforced Concrete (rc) with FRP Sheets Using Different Guidelines

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World Journal of Engineering and Technology 2023年第2期11卷 281-292页

作者： Bashir H. Osman Civil Engineering Department College of Engineering University of Sinnar Sinnar Sudan

The aim of this study is to investigate the influence of fiber reinforcement polymer (FRP) on shear behavior of reinforcement concrete (rc) beams with various guidelines. The FRP thickness, beam depth and concrete strength at ultimate load are considered as main strength parameters. A finite element (FE) by using ANSYS computer program was used to analyze the reinforced concrete beams. The numerical models were used to investigate the effect of beam depth, concrete strength, CFRP sheet configuration, and CFRP sheet thickness on the behavior of reinforced concrete beams strengthened with CFRP sheets compared with different guidelines. The results from ACI guideline show little difference compared with FE, which make it suitable for rc beams strengthened with FRP sheets.

关键词： FRP Sheets Strengthening rc beams ANSYS ACI

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Calculation of diagonal section and cross-section bending capacity for strengthening rc structure using high-performance ferrocement laminate

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Frontiers of Structural and Civil Engineering 2009年第3期3卷 330-338页

作者： Shouping SHANG Fangyuan ZHOU Wei LIU Civil Engineering College Hunan UniversityChangsha 410082China

Because there is a great demand of reinforce-ment and retrofitting of aged structures nationwide,as well as the rapid development of innovative building materials,the adoption of strengthening rc structures using new inorganic materials has become possible.High-performance ferrocement laminate(HPFL)is an effective method of strengthening concrete structure.High-performance ferrocement laminate is a new type of inorganic material with the advantages such as high strength,small contraction,good bonding properties,etc.This paper introduces the formula of cross-section bending capacity for strengthening concrete beams with HPEL.A comparative analysis of experimental data,as well as the calculation of diagonal section bearing capacity of concrete members,is given.

关键词： rc beams high-performance ferrocement laminate(HPFL) inorganic material reinforcement

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Experimental Analysis of Shear Repair for Reinforced Concrete beams with Prestressed GFRP Plate Bonding

Experimental Analysis of Shear Repair for Reinforced Concret...

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2004年世界工程师大会

作者： Wang Xingguo Zhou Chaoyang Zeng Xiantao Ding Ya-hongDepartment of Civil Engineering Central South University Changsha Hunan China Department of Civil Engineering Jiaozuo Institute of Technology Jiaozuo Henan China

＜正＞ Strengthening rc beams bonded with Fi-ber-reinforced-polymer （FRP）, which can increase the ultimate load capacity and safety capacity for engineering structure, has become an attractive strengthening problems in the field of engineering structure in the recent years. In this paper, rc beams are strengthened with prestressed Glass-fiber-reinforced-polymer （GFRP） plates bonded on the soffit of test beams and with GFRP plates on the sides. The pre-tressing technology is described before results obtained during the application and release of the prestress and subsequent four bending monotonic testing to failure of the strengthened beams is presented. Experimental data on strength, steel strain, GFRP strain, deflection, failure mode, and crack mode of repaired beams are obtained, and comparisons between the different shear repair schemes and the unrepaired control beams are made. The main conclusions drawn from the work are noted at the end of the paper and these indicate that the technique of prestressing FRP prior to bonding to reinforced concrete beams has the potential to provide a more efficient solution to strengthening problems.

关键词： structure engineering rc beams GFRP plate prestress shear repair safety capacity

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