Improving the Flexural Response of Timber Beams Using Externally Bonded Carbon Fiber-Reinforced Polymer (CFRP) Sheets

Author:

Mansour Walid12ORCID,Li Weiwen1ORCID,Wang Peng13ORCID,Fame Cheikh Makhfouss1,Tam Lik-ho4ORCID,Lu Yao1,Sobuz Md. Habibur Rahman5ORCID,Elwakkad Noha Yehia6

Affiliation:

1. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China

2. Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh 33516, Egypt

3. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China

4. School of Transportation Science and Engineering, Beihang University, Beijing 100191, China

5. Department of Building Engineering and Construction Management, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh

6. Civil Engineering Department, Faculty of Engineering, Damanhour University, Damanhour 22511, Egypt

Abstract

This paper presents a numerical investigation of the flexural behavior of timber beams externally strengthened with carbon-fiber-reinforced polymer (CFRP) sheets. At first, the accuracy of linear elastic and elastic-plastic models in predicting the behavior of bare timber beams was compared. Then, two modeling approaches (i.e., the perfect bond method and progressive damage technique using the cohesive zone model (CZM)) were considered to simulate the interfacial behavior between FRP and timber. The models were validated against published experimental data, and the most accurate numerical procedure was identified and subsequently used for a parametric study. The length of FRP sheets varied from 50% to 100% of the total length of the beam, while different FRP layers were considered. Moreover, the effects of two strengthening configurations (i.e., FRP attached in the tensile zone only and in both the tensile and compressive zones) on load-deflection response, flexural strength, and flexural rigidity were considered. The results showed that elastic-plastic models are more accurate than linear elastic models in predicting the flexural strength and failure patterns of bare timber beams. In addition, with increasing FRP length, the increase in flexural strength ranged from 10.3% to 52.9%, while no further increase in flexural strength could be achieved beyond an effective length of 80% of the total length of the beam. Attaching the FRP to both the tensile and compressive zone was more effective in enhancing the flexural properties of the timber beam than attaching the FRP to the tensile zone only.

Funder

Shenzhen Science and Technology Innovation Committe

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering

Publisher

MDPI AG

Reference42 articles.

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