Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams
This work assesses the flexural performance of prestressed concrete beams with external carbon fiber-reinforced polymer (CFRP) tendons, focusing on tendon-related variables. A finite element analysis (FEA) method is verified. A numerical parametric analysis of prestressed concrete beams with externa...
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| Format: | Article |
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MDPI AG
2023-07-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/14/5197 |
| _version_ | 1797588398082359296 |
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| author | Tiejiong Lou Han Hu Miao Pang |
| author_facet | Tiejiong Lou Han Hu Miao Pang |
| author_sort | Tiejiong Lou |
| collection | DOAJ |
| description | This work assesses the flexural performance of prestressed concrete beams with external carbon fiber-reinforced polymer (CFRP) tendons, focusing on tendon-related variables. A finite element analysis (FEA) method is verified. A numerical parametric analysis of prestressed concrete beams with external CFRP tendons is carried out. Four tendon-related variables are considered, namely, the area, initial prestress, depth and elastic modulus of tendons. The analysis shows that flexural ductility decreases as the tendon area, initial prestress or elastic modulus increases but is insensitive to the tendon depth. The ultimate tendon stress increment (Δ<i>σ<sub>p</sub></i>) is influenced by all of the four variables investigated. JGJ 92-2016 (Chinese technical specification for concrete structures prestressed with unbonded tendons) significantly underestimates Δ<i>σ<sub>p</sub></i> and, hence, is over-conservative for the strength design of these beams. An equation is proposed for calculating Δ<i>σ<sub>p</sub></i>, taking into account all four variables investigated. An analytical model is then developed to estimate the flexural strength (<i>M<sub>u</sub></i>) of prestressed concrete beams with external CFRP tendons. The proposed analytical model shows good agreement with FEA, i.e., the mean discrepancy for Δ<i>σ<sub>p</sub></i> is 0.9% with a standard deviation of 11.1%; and the mean discrepancy for <i>M<sub>u</sub></i> is −1.6% with a standard deviation of 2.1%. |
| first_indexed | 2024-03-11T00:51:25Z |
| format | Article |
| id | doaj.art-0a43cb5bc6ed4aa9869643ef70ddf112 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:51:25Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-0a43cb5bc6ed4aa9869643ef70ddf1122023-11-18T20:19:28ZengMDPI AGMaterials1996-19442023-07-011614519710.3390/ma16145197Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete BeamsTiejiong Lou0Han Hu1Miao Pang2School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, ChinaSchool of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, ChinaDepartment of Civil Engineering, Zhejiang University, Hangzhou 310058, ChinaThis work assesses the flexural performance of prestressed concrete beams with external carbon fiber-reinforced polymer (CFRP) tendons, focusing on tendon-related variables. A finite element analysis (FEA) method is verified. A numerical parametric analysis of prestressed concrete beams with external CFRP tendons is carried out. Four tendon-related variables are considered, namely, the area, initial prestress, depth and elastic modulus of tendons. The analysis shows that flexural ductility decreases as the tendon area, initial prestress or elastic modulus increases but is insensitive to the tendon depth. The ultimate tendon stress increment (Δ<i>σ<sub>p</sub></i>) is influenced by all of the four variables investigated. JGJ 92-2016 (Chinese technical specification for concrete structures prestressed with unbonded tendons) significantly underestimates Δ<i>σ<sub>p</sub></i> and, hence, is over-conservative for the strength design of these beams. An equation is proposed for calculating Δ<i>σ<sub>p</sub></i>, taking into account all four variables investigated. An analytical model is then developed to estimate the flexural strength (<i>M<sub>u</sub></i>) of prestressed concrete beams with external CFRP tendons. The proposed analytical model shows good agreement with FEA, i.e., the mean discrepancy for Δ<i>σ<sub>p</sub></i> is 0.9% with a standard deviation of 11.1%; and the mean discrepancy for <i>M<sub>u</sub></i> is −1.6% with a standard deviation of 2.1%.https://www.mdpi.com/1996-1944/16/14/5197external prestressingCFRP tendonflexural strengthtendon stressnumerical modelinganalytical model |
| spellingShingle | Tiejiong Lou Han Hu Miao Pang Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams Materials external prestressing CFRP tendon flexural strength tendon stress numerical modeling analytical model |
| title | Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams |
| title_full | Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams |
| title_fullStr | Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams |
| title_full_unstemmed | Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams |
| title_short | Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams |
| title_sort | effect of tendon related variables on the behavior of externally cfrp prestressed concrete beams |
| topic | external prestressing CFRP tendon flexural strength tendon stress numerical modeling analytical model |
| url | https://www.mdpi.com/1996-1944/16/14/5197 |
| work_keys_str_mv | AT tiejionglou effectoftendonrelatedvariablesonthebehaviorofexternallycfrpprestressedconcretebeams AT hanhu effectoftendonrelatedvariablesonthebehaviorofexternallycfrpprestressedconcretebeams AT miaopang effectoftendonrelatedvariablesonthebehaviorofexternallycfrpprestressedconcretebeams |