scholarly journals Ductility of the Tensile Zone in Bent Wooden Beams Strengthened with CFRP Materials

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5451 ◽  
Author(s):  
Agnieszka Wdowiak-Postulak ◽  
Janusz Brol
Keyword(s):  
Cross Sections ◽  
Experimental Tests ◽  
Maximum Load ◽  
Fiber Reinforced Polymers ◽  
Tension Zone ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Reinforced Beams ◽  
Scale Models ◽  
Strength And Stiffness

This article presents experimental results from the bending of technical-scale models of beams reinforced in the tension zone with CFRP (Carbon Fiber Reinforced Polymers) materials, with a focus on the benefits resulting from the increased ductility in the tension zone of these beams. In experimental tests, the mechanical properties of reinforced beams were compared with unreinforced beams in terms of the maximum load, deflection, images of damage, stiffness, and distribution of deformation. The results showed that the proposed reinforcement solution was advantageous due to its strength and stiffness, and the safety of the structure. Based on this analysis, it was concluded that the reinforcement of wood with CFRP materials has a positive effect on the behavior and safety of structures. Also, a method of analytical checking of strengthened beams with small cross-sections was presented in the article.

Crack Resistance RC Columns Strengthened by CFRP System

2021 ◽  
Vol 878 ◽  
pp. 127-133
Author(s):  
J. Selejdak ◽  
Y. Blikharskyy ◽  
R. Khmil ◽  
Z. Blikharskyy
Keyword(s):  
Crack Resistance ◽  
Experimental Testing ◽  
Experimental Studies ◽  
Concrete Columns ◽  
Fiber Reinforced Polymers ◽  
Tension Zone ◽  
Carbon Fiber Reinforced Polymers ◽  
Rc Columns ◽  
Reinforced Polymers ◽  
Compression Load

This paper presents the experimental testing of eccentrically compressed reinforced concrete columns. There are experimental results of crack resistance of non-strengthened (control) and strengthened RC columns in the tension zone. The columns were strengthened by carbon fiber reinforced polymers (CFRP). As a result of experimental studies with the columns strengthened by CFRP, we obtain that the width of their crack decreased by an average of 33%. The eccentric compression load of the crack’s appearance increased from 40 kN to 60 kN for strengthened columns.

scholarly journals Experimental Study of a New Strengthening Technique of RC Beams Using Prestressed NSM CFRP Bars

2019 ◽  
Vol 11 (5) ◽  
pp. 1374 ◽  
Author(s):  
Vicente Alcaraz Carrillo de Albornoz ◽  
Eva García del Toro ◽  
M. Isabel Más-López ◽  
Alfredo Luizaga Patiño
Keyword(s):  
High Performance ◽  
Fiber Reinforced Polymers ◽  
Carbon Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Near Surface ◽  
Environmentally Sustainable ◽  
Sustainable Solutions ◽  
Reinforced Beams ◽  
A New Technique ◽  
Strengthening Technique

The reinforcement of structural elements subjected to bending with carbon fiber reinforced polymers (CFRP) located on the underside of the element to be reinforced (known as near surface mounted or NSM) is an effective technique that provides environmentally sustainable solutions in the field of civil engineering. Introducing preloads on the reinforcing elements allows us to maximize the high performance of CFRPs, besides recovering deformations. A new technique to perform the pre-stressing of CFRP bars in NSM configuration is described in this paper. The technique introduces the preload on the rods after they have been placed in the grooves, and with a system that acts and reacts against the beam itself. We also present the results of a testing campaign conducted to determine the effectiveness of said technique. Breakage of the control beams (without reinforcement) was ductile, while breakage of reinforced beams was explosive. Pre-stressing the reinforcing elements allowed us to increase the bearing capacity of the beams 170% compared to the control beams, also resulting in an increase in the rigidity of the reinforced elements and a decreased cracking of the beam. The results however are only slightly better than those of a conventional CFRP NSM reinforcement, due to the appearance of cavities in the groove where the adhesive didn’t manage to penetrate.

Experimental Study on Orthogonal Cutting of 0° T700/LT03A CFRP Uniform Laminates

2014 ◽  
Vol 800-801 ◽  
pp. 76-80 ◽  
Author(s):  
Sheng Qin ◽  
Zheng Wei Li ◽  
Hong Zhou Zhang ◽  
Qing Long An ◽  
Ming Chen
Keyword(s):  
Carbon Fiber ◽  
Fiber Orientation ◽  
Orthogonal Cutting ◽  
Cutting Temperature ◽  
Fiber Reinforced Polymers ◽  
Carbon Fiber Reinforced Polymers ◽  
Machine Material ◽  
Reinforced Polymers ◽  
Specific Strength ◽  
Strength And Stiffness

Carbon fiber reinforced polymers (CFRP) are increasingly used in aerospace and other industries, due to its high specific strength and stiffness. Machining operations are involved between forming fabrication and assembling as a fining process, during which defects like delamination, burrs and splintering are the main cause of substandard products. This is because that CFRP is a typical difficult to machine material with distinct anisotropy and heterogeneity. Thus machinability of CFRP material under different fiber orientations is a main issue. This paper intensively investigated on cutting forces and temperatures when orthogonal cutting of 0° T700/LT03A CFRP uniform laminates, with fiber orientation from 0°to 180°. Material removal mechanisms and carbon fiber fraction modes under various fiber orientations were discussed. The results showed that fiber orientation of 90°is the worst scenario of cutting, under which condition the force and temperature of the highest level, while that of 150°indicates the other. The results of cutting temperature indicated that it is mainly from the friction heat in the zone III generated by the thrust force.

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