Experimental Study on Bond Behavior between CFRP Sheet and Wood

2011 ◽  
Vol 368-373 ◽  
pp. 2314-2318
Author(s):  
Qi Fang Xie ◽  
Jian Yang Xue ◽  
Hong Tie Zhao ◽  
Jun Fang Hu
Keyword(s):  
Experimental Study ◽  
Bond Length ◽  
Strain Distribution ◽  
Fiber Reinforced Polymer ◽  
Engineering Practice ◽  
Bond Behavior ◽  
Cfrp Sheets ◽  
Reinforced Polymer ◽  
Cfrp Sheet ◽  
Edge Location

Fiber-reinforced polymer (FRP) has been applied to reinforce wood structure with its many advantages. But results of experimental study and engineering practice have showed that the failure is generally caused for lack of bong strength between FRP and wood, so the bond behavior between FRP and wood is very important. In this paper, based on the shear bond experiment between wood and CFRP sheet, the bond properties are researched such as failure character, characteristic of strain distribution, effective bond length and bond strength. Results showed that: at the loaded-end, the strain of the CFRP sheets is the maximum, and then strains decrease quickly with the increase in distance from the loaded-end. Strain distribution along cross direction is not uniform and the strains of the center location are bigger obviously than that of the edge location. The effective bond length between CFRP sheet and wood is more than 120mm.

Experimental study on the behavior of carbon fiber reinforced polymer sheets bonded to concrete

2006 ◽  
Vol 33 (11) ◽  
pp. 1438-1449 ◽  
Author(s):  
Ayman S Kamel ◽  
Alaa E Elwi ◽  
Roger J.J Cheng
Keyword(s):  
Carbon Fiber ◽  
Failure Mechanism ◽  
Test Method ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Bond Behavior ◽  
Cfrp Sheets ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

This paper presents a study on the interfacial behavior of carbon fiber reinforced polymer (CFRP) sheets when applied to concrete members as external reinforcement. Two bond test methods that are detailed in the paper were used in separate test series to study the bond behavior and failure mechanism of CFRP sheets bonded to concrete. A modified push-apart test method was proposed and tested. It was concluded that there existed an effective length beyond which there will be no increase in the ultimate capacity of the joint. An experimental test method to determine the effective bond length was also proposed and tested. The strains at the edge of the CFRP sheets are consistently higher than those at the center. The anchorage requirements for the CFRP sheets were also investigated in this study. Anchor sheets placed at 90° to the primary test sheets and bonded underneath the tested sheet showed better or equivalent overall bond behavior compared with those bonded on top of the tested sheet. The distance at which the anchor sheet is placed from the crack does not appear to change the bond behavior.Key words: bond, concrete, debonding, failure mechanism, carbon fiber reinforced polymer (CFRP) sheets, anchor sheets.

An Study on the Flexural Performance of Reninforced Concrete Beams Considering Loading History with Pre-Stressed Cfrp Sheets

2011 ◽  
Vol 105-107 ◽  
pp. 853-856
Author(s):  
Zhe Li ◽  
Gang Li ◽  
Qin Zhao ◽  
Shuai Zhang
Keyword(s):  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Impact Factors ◽  
Cfrp Sheets ◽  
Flexural Performance ◽  
Reinforced Polymer ◽  
Secondary Load ◽  
Cfrp Sheet

For the effect of nonpre-stressed carbon fiber reinforced polymer (CFRP) Sheet Strengthening concrete beams to improve bending stiffness and crack resistance is not satisfactory, and it is difficult to totally unloading on the actual reinforcement, so in this paper, ANSYS is used to research the strengthened effectiveness and impact factors of pre-stressed CFRP reinforced concrete beams considering the secondary load.

scholarly journals BEHAVIOR OF HIGH-STRENGTH CONCRETE CYLINDERS REPAIRED WITH CFRP SHEETS

2015 ◽  
Vol 22 (1) ◽  
pp. 56-64 ◽  
Author(s):  
Mohammad PANJEHPOUR ◽  
Nima FARZADNIA ◽  
Ramazan DEMIRBOGA ◽  
Abang Abdullah Abang ALI
Keyword(s):  
High Strength Concrete ◽  
Empirical Relationship ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Strength Concrete ◽  
Cfrp Sheets ◽  
Reinforced Polymer ◽  
Concrete Cylinders ◽  
Cfrp Sheet

This study aims to investigate the behavior of damaged high-strength concrete cylinders repaired using carbon fiber reinforced polymer (CFRP) sheet. The experimental work on CFRP-wrapped concrete cylinders with various predamage levels indicated that CFRP can precisely resist the axial aggravated deformation of cylinders caused by damaging under uniaxial loading. The findings also revealed that the energy absorption of the damaged specimens confined with CFRP was restored approximately three times more than that of the undamaged specimens without confinement. Therefore, an empirical relationship exists between the pre-damage levels and the uniaxial compressive strength reduction of the concrete cylinders.

scholarly journals Analysis of Strengths of Reinforced Concrete Beam Structures with CFRP Sheet Using Abaqus Software 6.14

2019 ◽  
Vol 21 (1) ◽  
pp. 9-19
Author(s):  
Ahmad Yasir ◽  
Mahmud Kori Effendi ◽  
Arie Taveriyanto ◽  
Henry Apriyatno
Keyword(s):  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Polymer ◽  
Test Beam ◽  
Reinforcement Structure ◽  
Modeling And Analysis ◽  
Cfrp Sheets ◽  
Reinforced Polymer ◽  
Cfrp Sheet ◽  
Abaqus Software

Abstract. Concrete beams are parts of a structure that serves as a channeling moment to the column structure. The structure of the beam which has undergone yielding reinforcement must be repaired. One of the beam repairs that can be done is by providing reinforcement using Carbon Fiber Reinforced Polymer (CFRP) sheets. The reinforcement structure modeling and analysis were carried out using the Abaqus software. There are two types of modeling, those were laboratory test beam modeled with Abaqus (BPA) and reinforced beam using CFRP (BPC). The beam structure analysis using Abaqus software showed that BPA beam experiences a first crack when the load is 5311.96 lbs with a 0.08 inch displacement, while the BPC-2 beam is first cracked at a load of 5019.93 lbs with a 0.10 inch displacement. The BPA beam experiences an ultimate when the load was 12620.84 lbs with a 0.64-inch displacement, while the BPC-2 beam experiences ultimate when the load was 12403.48 lbs with a displacement of 0.60 inch. The type of crack pattern in both beam models is the type of bending crack.

scholarly journals An Anchoring Groove Technique to Enhance the Bond Behavior between Heat-Damaged Concrete and CFRP Composites

Buildings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 232
Author(s):  
Rajai Al-Rousan ◽  
Mohammad AL-Tahat
Keyword(s):  
Elevated Temperatures ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Bond Behavior ◽  
Reinforced Polymer ◽  
Cfrp Composites ◽  
Bonding Area ◽  
Cfrp Sheet ◽  
Cfrp Composite ◽  
Type Of Failure

This experimental study was conducted to evaluate the effectiveness of using carbon fiber-reinforced polymer (CFRP) composites with special anchoring grooves, specifically in terms of the ability of the concrete–CFRP bond to withstand elevated temperatures. The obtained findings of this experiment clearly highlighted the effectiveness of the direction of the anchoring grooves on the behavior of the concrete–CFRP bonding area. The results also showed that high temperatures lessen the bond’s strength and the ultimate slippage. On the other hand, this study showed that increasing the length of the CFRP sheet resulted in enhancement of the bond’s strength and slippage. When exposed to temperatures above 500 °C, the structures’ residual splitting and compression strength decreased significantly, resulting in the bond’s strength reducing to 67% and the slippage to 19%, with respect to the control samples. In the non-grooved and vertically grooved beams, the CFRP–concrete bond showed a skin-peeling type of failure. It appeared, also, that the temperature and the number of anchored grooves significantly affected the bonding area of the surface; as the surface was exposed to failure in adhesion, more concrete remained attached to the CFRP composite, signifying a stronger attachment.

Bond Behavior of Aluminum Laminates in NSM Technique

2014 ◽  
Vol 501-504 ◽  
pp. 1053-1060 ◽  
Author(s):  
Ji Hua Zhu ◽  
Miao Chang Zhu ◽  
Liang Liang Wei ◽  
Wei Wen Li ◽  
Feng Xing
Keyword(s):  
Bond Length ◽  
Applied Force ◽  
Fiber Reinforced Polymer ◽  
Test Results ◽  
Interfacial Bond ◽  
Bond Behavior ◽  
Reinforced Polymer ◽  
Measured Strain ◽  
Average Bond ◽  
Nsm Technique

An attempt was made to replace the commonly used Fiber Reinforced Polymer (FRP) with aluminium alloy in NSM technique. This paper presents experimental investigation of interfacial bond behavior between NSM aluminium laminates and concrete structures. Aluminum laminates were mounted into premade slit of concrete with epoxy resin. Test results show that both maximum applied force and ductility of NSM reinforced specimens can be effectively improved by increasing bond length and width of aluminium laminates, whilst almost no change was found in average bond strength at the same time. Besides, the loaded end slip of specimen, corresponding to the maximum applied force, was mutually influenced by bond length and width of aluminium laminates. Furthermore, the measured strain distribution of aluminium laminates along the direction of bond length of specimen was found to be similar to that of FRP in NSM technique.

Restoring Initially Cracked Reinforced Concrete Beams utilizing Carbon Fiber Reinforced Polymer Strips

2019 ◽  
Vol 7 (1) ◽  
pp. 30-34
Author(s):  
A. Ajwad ◽  
U. Ilyas ◽  
N. Khadim ◽  
Abdullah ◽  
M.U. Rashid ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Loading Test ◽  
Control Beam ◽  
Reinforced Polymer ◽  
Cfrp Sheet ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced polymer (CFRP) strips are widely used all over the globe as a repair and strengthening material for concrete elements. This paper looks at comparison of numerous methods to rehabilitate concrete beams with the use of CFRP sheet strips. This research work consists of 4 under-reinforced, properly cured RCC beams under two point loading test. One beam was loaded till failure, which was considered the control beam for comparison. Other 3 beams were load till the appearance of initial crack, which normally occurred at third-quarters of failure load and then repaired with different ratios and design of CFRP sheet strips. Afterwards, the repaired beams were loaded again till failure and the results were compared with control beam. Deflections and ultimate load were noted for all concrete beams. It was found out the use of CFRP sheet strips did increase the maximum load bearing capacity of cracked beams, although their behavior was more brittle as compared with control beam.

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