| Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer-Part I： Experimental study |
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| 作者姓名： | HUANGYue-lin WUJong-hwei YENTsong HUNGChien-hsing LINYiching |
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| 作者单位： | Department of Civil Engineering，National Chung-Hsing University，40227，Taiwan，China，Department of Civil Engineering，National Chung-Hsing University，40227，Taiwan，China，Department of Civil Engineering，National Chung-Hsing University，40227，Taiwan，China，Department of Civil Engineering，National Chung-Hsing University，40227，Taiwan，China |
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| 摘 要： | INTRODUCTION The aging or deterioration of existing R. C.(reinforced concrete) or P. C. (prestressed concrete)structures is one of the major problems that modernengineers have to face. If the flexural or shear strengthof R. C. or P. C. structures is not sufficient to maintaintheir service functions, strengthening of these struc-tures becomes necessary. To date, steel plates havebeen used to strengthen concrete members. Usingcomposite plates to strengthen R.C. or P.C. structures…
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| 关 键 词： | 预应力 混凝土梁 玻璃纤维增强聚合物 碳纤维 钢板 |
Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer—Part I: Experimental study |
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| HUANGYue-lin WUJong-hwei YENTsong HUNGChien-hsing LINYiching.Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer—Part I: Experimental study[J].Journal of Zhejiang University Science,2005,6(3):166-174. |
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| Authors: | Huang Yue-lin Wu Jong-hwei Yen Tsong Hung Chien-hsing Lin Yiching |
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| Institution: | (1) Department of Civil Engineering, National Chung-Hsing University, 40227, Taiwan, China |
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| Abstract: | This work is aimed at studying the strengthening of reinforced concrete (R. C.) beams using prestressed glass fiber-reinforced
polymer (PGFRP). Carbon fiber-reinforced polymer (CFRP) has recently become popular for use as repair or rehabilitation material
for deteriorated R. C. structures, but because CFRP material is very stiff, the difference in CFRP sheet and concrete material
properties is not favorable for transferring the prestress from CFRP sheets to R. C. members. Glass fiber-reinforced polymer
(GFRP) sheets with Modulus of Elasticity quite close to that of concrete was chosen in this study. The load-carrying capacities
(ultimate loads) and the deflections of strengthened R. C. beams using GFRP and PGFRP sheets were tested and compared. T-
and ⊥-shaped beams were used as the under-strengthened and over-strengthened beams. The GFRP sheets were prestressed to one-half
their tensile capacities before being bonded to the T- and ⊥-shaped R. C. beams. The prestressed tension in the PGFRP sheets
caused cambers in the R. C. beams without cracks on the tensile faces. The PGFRP sheets also enhanced the load-carrying capacity.
The test results indicated that T-shaped beams with GFRP sheets increased in load-carrying capacity by 55% while the same
beams with PGFRP sheets could increase load-carrying capacity by 100%. The ⊥-shaped beams with GFRP sheets could increase
load-carrying capacity by 97% while the same beams with PGFRP sheets could increase the loading-carrying capacity by 117%.
Under the same external loads, beams with GFRP sheets underwent larger deflections than beams with PGFRP sheets. While GFRP
sheets strengthen R. C. beams, PGFRP sheets decrease the beams' ductility, especially for the over-strengthened beams (⊥-shaped
beams). |
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| Keywords: | Strengthening Prestressed glass fiber reinforcement polymer Modulus of Elasticity R C beams |
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