Mechanical Performance Evaluation of Concrete Beams Strengthened with Carbon Fiber Materials

Ding, Jing; Huang, Xia; Zhu, Gang; Song, Chen; Guo-chao, Wang

doi:10.1155/2013/572151

Cited by 5 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, for the concrete beams reinforced with CFRP, (26)-(28) are not in relation with the length and the thickness of the CFRP layer. In combination with the previous works [21][22][23], (26)-(28) can work very well in calculating the ultimate load capacity for any CFRP-reinforced concrete beams. Figure 12 shows the effects of the length of CFRP and the initial notch depth on the ultimate load capacity of the CFRP-reinforced beams.…”

Section: Failure Modesmentioning

confidence: 74%

“…Comparing with the theoretical derivation discussed in Section 2.4, the method for calculating the ultimate load for the concrete beam showed a good agreement with the experimental measurement ( Figure 5). However, for the reinforced concrete beams, a detailed analysis requires a combination with finite element method [21][22][23]. Equations ((26)-(28)) aim especially for the case in which the stress intensity factor can be explicitly calculated.…”

Section: Failure Modesmentioning

confidence: 99%

See 1 more Smart Citation

An Experimental Investigation on the Failure Behavior of a Notched Concrete Beam Strengthened with Carbon Fiber-Reinforced Polymer

Huang

Wang

Zhang

et al. 2015

International Journal of Polymer Science

Self Cite

View full text Add to dashboard Cite

This paper presents an experiment investigation on the failure behavior of a notched concrete beam reinforced with CFRP, by exploring the influences of the length, thickness, and CFRP bonding methods on the ultimate bearing capacity and failure mode. The interfacial shear stress has first been analytically derived and parametric analyses are then made to predict the failure mode. The experiment observation finds that failure mode significantly depends on CFRP length. The brittle fracture occurs only for nonstrengthened beams; the shear failure I mode mainly occurs when CFRP laminate is 100 mm long; the shear failure II mode mainly occurs when CFRP laminate is 200 mm long; and the delamination failure mode mainly occurs when CFRP laminate is 350 mm long. Meanwhile, the thickness and the bonding methods of CFRP also influence the final failure modes in terms of CFRP length. The measurement on ultimate load shows that an increase in the length of CFRP up to 200 mm significantly improves the bearing capacity of the reinforced beam. A comparison between a theoretical analysis and the experimental observation shows a good agreement in terms of failure modes indicating the accuracy and the validity of the experiment.

show abstract

Section: Failure Modesmentioning

confidence: 74%

Section: Failure Modesmentioning

confidence: 99%

An Experimental Investigation on the Failure Behavior of a Notched Concrete Beam Strengthened with Carbon Fiber-Reinforced Polymer

Huang

Wang

Zhang

et al. 2015

International Journal of Polymer Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…The amount of damage or the length of CFRP-bonded beams depends on the timely strengthening effect during retrofitting. Our previous works [22][23][24] show that the influence of the initial crack length (in the form of a notch) is only obvious at the regional stress field near the initial crack tip, but is negligible at the overstressed region of the carbon fiber plate, as well as at the interface between the carbon fiber plate and concrete. Moreover, the initial crack propagation stops after reaching a certain length.…”

Section: Introductionmentioning

confidence: 99%

The Effect of CFRP Length on the Failure Mode of Strengthened Concrete Beams

et al. 2014

Self Cite

View full text Add to dashboard Cite

This paper reports the effects of carbon fiber-reinforced polymer (CFRP) length on the failure process, pattern and crack propagation for a strengthened concrete beam with an initial notch. The experiments measuring load-bearing capacity for concrete beams with various CFRP lengths have been performed, wherein the crack opening displacements (COD) at the initial notch are also measured. The application of CFRP can significantly improve the load-bearing capacity, and the failure modes seem different with various CFRP lengths. The stress profiles in the concrete material around the crack tip, at the end of CFRP and at the interface between the concrete and CFRP are then calculated using the finite element method. The experiment measurements are validated by theoretical derivation and also support the finite element analysis. The results show that CFRP can significantly increase the ultimate load of the beam, while such an increase stops as the length reaches 0.15 m. It is also concluded that the CFRP length can influence the stress distribution at three critical stress regions for strengthened concrete beams. However, the optimum CFRP lengths vary with different critical stress regions. For the region around the crack tip, it is 0.15 m; for the region at the interface it is 0.25 m, and for the region at the end of CFRP, it is 0.30 m. In conclusion, the optimum CFRP length in this work is 0.30 m, at which CFRP strengthening is fully functioning, which thus provides a good reference for the retrofitting of buildings.

show abstract

“…PAN-based carbon fiber is used in many kinds of composites, due to its high strength. Process development studies have been widely conducted because high performance carbon fiber can be obtained via stabilization and the carbonization process [5][6][7]. After the carbonization process of the wellcontrolled stabilization of PAN-based carbon fiber, that material's tensile and shear strength would be improved so that it can be applied to the composite material.…”

Section: Introductionmentioning

confidence: 99%

Preparation of PAN Spinning Solution with Fine Dispersion of Cellulose Microparticles

Yang

Won

Jin

et al. 2015

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

This study suggested the optimum conditions for the stable dispersion of cellulose microparticles in PAN spinning dope, which was prepared for spinning the fiber. Many research studies have investigated methods for preparing a variety of carbon fiber precursors in an attempt to control their characteristics according to the applications. In order to prepare PAN fiber that contains fine cellulose particles, it is important to create a uniformly dispersed spinning dope. Minimization of the cellulose particle size was subjected to heat treatment at various temperatures in order to reduce the cohesive force from the hydrogen bonds between the cellulose molecules. Carbonized cellulose microparticles were obtained for efficient dispersion using the physical method and the sedimentation method. Several instrumental analyses were conducted to study the characteristics of the particles and solutions with SEM, FT-IR, XRD, and a particle size analyzer. From the results, the dispersion of the PAN spinning dope with a chemical treatment was superior to the milling method followed by heat treatment. In this study, heat-treating cellulose microparticles at 400°C was found to be the most effective method.

show abstract

Mechanical Performance Evaluation of Concrete Beams Strengthened with Carbon Fiber Materials

Cited by 5 publications

References 11 publications

An Experimental Investigation on the Failure Behavior of a Notched Concrete Beam Strengthened with Carbon Fiber-Reinforced Polymer

An Experimental Investigation on the Failure Behavior of a Notched Concrete Beam Strengthened with Carbon Fiber-Reinforced Polymer

The Effect of CFRP Length on the Failure Mode of Strengthened Concrete Beams

Preparation of PAN Spinning Solution with Fine Dispersion of Cellulose Microparticles

Contact Info

Product

Resources

About