EXPERIMENTAL RESEARCH ON STRESS LOSS OF LARGE-SIZED CONCRETE COLUMNS STRENGTHENED WITH PRESTRESSED CFRP SHEETS

LU Chunling; ZHANG Zheming; LI Bolin; WANG Peng

doi:10.13204/j.gyjz202006028

Volume 50 Issue 6

Aug. 2020

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LU Chunling, ZHANG Zheming, LI Bolin, WANG Peng. EXPERIMENTAL RESEARCH ON STRESS LOSS OF LARGE-SIZED CONCRETE COLUMNS STRENGTHENED WITH PRESTRESSED CFRP SHEETS[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(6): 175-182. doi: 10.13204/j.gyjz202006028

Citation:

LU Chunling, ZHANG Zheming, LI Bolin, WANG Peng. EXPERIMENTAL RESEARCH ON STRESS LOSS OF LARGE-SIZED CONCRETE COLUMNS STRENGTHENED WITH PRESTRESSED CFRP SHEETS[J]. INDUSTRIAL CONSTRUCTION, 2020, 50(6): 175-182. doi: 10.13204/j.gyjz202006028

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EXPERIMENTAL RESEARCH ON STRESS LOSS OF LARGE-SIZED CONCRETE COLUMNS STRENGTHENED WITH PRESTRESSED CFRP SHEETS

doi: 10.13204/j.gyjz202006028

1. College of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004, China;
2. Guangxi Key Laboratory of Rock-Soil Mechanics and Engineering, Guilin 541004, China;
3. Guilin University of Technology, Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin 541004, China

Received Date: 2019-12-20
Publish Date: 2020-08-20

Abstract

Abstract

The prestress loss of concrete structure reinforced with prestressed carbon fiber reinforced plastics (CFRP) is an important factor affecting the reinforcing effect. In order to study the prestress loss law of large-sized concrete column strengthened with prestressed carbon fiber reinforced plastics (CFRP). According to the law, the CFRP was strengthened annularly by self-locking anchorage. The test results showed that friction loss was the main loss in tension process. The larger the prestress, the rougher the surface of the column and the larger the size of the section of the column, the greater the friction loss. The prestressing loss was caused by the deformation of anchorage, the shrinkage of CFRP sheets and the relaxation of CFRP sheets. The friction loss in tension process accounted for 70.9% to 80.8% of the total loss of CFRP sheets, while the loss after loading accounted for 19.2% to 29.1% of the total loss. Under the same conditions, the total CFRP loss of 1 m diameter column was 17.1% to 17.5% higher than that of 0.305 m diameter column. On the basis of experiments, the formulas for calculating the prestress loss during tension and loading were presented, which could provide a reference for calculating prestress loss.
- CFRPs,
- prestress loss,
- anchorage deformation,
- elastic retraction

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References(24)

References

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