scholarly journals A Retrofit Theory to Prevent Fatigue Crack Initiation in Aging Riveted Bridges Using Carbon Fiber-Reinforced Polymer Materials

Polymers ◽  
2016 ◽  
Vol 8 (8) ◽  
pp. 308 ◽  
Author(s):  
Elyas Ghafoori ◽  
Masoud Motavalli
Keyword(s):  
Fatigue Crack ◽  
Carbon Fiber ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Polymer Materials ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

Carbon fiber–reinforced polymer rod panels for strengthening concrete bridges

2017 ◽  
Vol 21 (4) ◽  
pp. 557-570 ◽  
Author(s):  
Abheetha Peiris ◽  
Issam Harik
Keyword(s):  
Carbon Fiber ◽  
Finger Joint ◽  
Polymer Materials ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Small Scale ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
Bond Tests

The practice of using fiber-reinforced polymer laminates and fabric to repair and strengthen concrete structures is well established. What limits the application of fiber-reinforced polymer materials, especially in flexural strengthening, is the equipment and man power needed for continuous application when retrofits take place over waterways or multilane roadways. A carbon fiber–reinforced polymer rod panel system consisting of 1220-mm (48-in) panels made continuous through a finger joint/splice was developed to overcome these limitations. The system’s performance hinges on whether forces can be transferred from one panel to another. This study investigated the bond characteristics of carbon fiber–reinforced polymer rods, as well as the flexural behavior of concrete members strengthened with carbon fiber–reinforced polymer rod panels, to improve knowledge of the finger joint’s behavior. Bond tests were conducted using double-lap shear specimens on individual rods with both steel and concrete substrates. Further bond tests were performed on small carbon fiber–reinforced polymer rod panels on steel substrate. Flexural tests were carried out under four-point bending on small-scale reinforced concrete beams that were strengthened using continuous carbon fiber–reinforced polymer rod panels and carbon fiber–reinforced polymer rod panels spliced using a finger joint. Case studies of four field applications are presented to provide a better understanding of the system. The new carbon fiber–reinforced polymer rod panels effectively reduce labor and equipment costs for work conducted on bridges with limited access, as they enabled the performance of repair/retrofit operations by a small crew working out of a single work platform.

scholarly journals The Impact of the HMCFRP Ratio on the Strengthening of Steel Composite I-Beams

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
E. Agcakoca ◽  
M. Aktas
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Polymer Materials ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Steel Beams ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
The Impact

Carbon fiber-reinforced polymer materials have become popular in the construction industry during the last decade for their ability to strengthen and retrofit concrete structures. The recent availability of high-modulus carbon fiber-reinforced polymer strips (HMCFRP) has opened up the possibility of using this material in strengthening steel structures as well. The strips can be used in steel bridge girders and structures that are at risk of corrosion-induced cross-sectional losses, structural deterioration from aging, or changes in function. In this study, a set of bending experiments was performed on three types of steel beams reinforced with HMCFRP. The results were used to enhance a nonlinear finite element model built with ABAQUS software. The accuracy of the mathematical models for HMCFRP, epoxy, and steel profiles was compared with the experimental results, and the ability of HMCFRP to continue carrying load from the steel beams during rupture and postrupture scenarios was observed using numerical analysis. Using these verified finite element models, a parametric analysis was performed on the HMCFRP failure modes and the quantity to be used with IPE profile steel beams. The maximum amount of HMCFRP needed for strengthening was determined, and an upper limit for its use was calculated to avoid any debonding failure of the fiber material.

Development of a longitudinal–torsional ultrasonic vibration-aided drilling system for drilling carbon fiber-reinforced polymer materials

2019 ◽  
Vol 233 (12) ◽  
pp. 4176-4186 ◽  
Author(s):  
Xiaobo Wang ◽  
Feng Jiao ◽  
Dong Wang ◽  
Ying Niu
Keyword(s):  
Carbon Fiber ◽  
Ultrasonic Vibration ◽  
Polymer Materials ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Ultrasonic Drilling ◽  
Drilling System ◽  
Carbon Fiber Reinforced

This study aimed to explore the motion properties of longitudinal–torsional ultrasonic vibration-aided drilling, the feature of drilling dynamics, and an efficient path of implementing longitudinal–torsional component conversion. It also aimed to propose a spiral chute horn with high performance and low cost based on the propagation characteristics of ultrasonic waves. The finite element software ANSYS was used for modal analysis and the geometric parameters of helical flutes were achieved. The dynamics analysis of the longitudinal–torsional ultrasonic drilling system revealed that the ultrasonic vibration could improve the rigidity of the drill and that the components existed in longitudinal and torsional directions. Drilling the T300-12K/AG80 unidirectional carbon fiber-reinforced polymer using the longitudinal–torsional ultrasonic drilling system revealed that the results of theoretical analysis and numerical simulation were comparable. This drilling system could change the longitudinal–torsional ratio according to the geometrical parameters of the modal converter, improve the surface quality of the carbon fiber-reinforced polymer hole, and reduce the exit delamination.

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