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Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer-Part I: Experimental study

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第8期6卷 166-174页

作者： WU Jong-hwei YEN Tsong HUNG Chien-hsing lin yiching Department of Civil Engineering National Chung-Hsing University 40227 Taiwan ChinaDepartment of Civil Engineering National Chung-Hsing University 40227 Taiwan ChinaDepartment of Civil Engineering National Chung-Hsing University 40227 Taiwan ChinaDepartment of Civil Engineering National Chung-Hsing University 40227 Taiwan China

This work is aimed at studying the strengthening of reinforced concrete (R. C.) beams using prestressed glass fi- ber-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 fi- ber-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).

关键词： Strengthening Prestressed glass fiber reinforcement polymer Modulus of Elasticity R. C. beams

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Using Ultrasonic Pulse Velocity to Evaluate Residual Compressive Strength of Post-fire-curing Concrete

Using Ultrasonic Pulse Velocity to Evaluate Residual Compres...

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17th World Conference on Non-Destructive Testing

作者： Hsuanchih YANG yiching lin Chiamen HSIAO Department of Civil Engineering National Chung Hsing University 250 Kuo-Kuang Rd.Taichung 402Taiwan Department of Interior Design National Taichung Institute of Technology129 Sanmin Rd.Sec.3Taichung 404Taiwan

In this paper,the ultrasonic pulse velocity (UPV) is used to quantitatively evaluate the residual compressive strength of post-fire-curing concrete subjected to elevated temperatures.A series of tests were performed to examine the relationship between the residual UPV and strength of post-fire-curing concrete. Cylindrical specimens were made of concrete with various mixture proportions, and heated in an electric furnace to temperatures ranging from 400 to 1000℃with an exposure time of 2 *** exposing to elevated temperatures,the concrete specimens were cooled down in the ambient air or water tank and then cured in water for different curing *** specimens were tested at the 7,30,90 and 180 days after *** each test,the pulse velocity and compressive strength were *** results show that the residual compressive strength of concrete decreases as the exposure temperature increases. In addition,prolonging the water-curing duration and extending the test days will help restore concrete strength ***,a general relationship between the residual strength and UPV ratios can be established to estimate the residual strength ratio of post-fire-curing concrete with a measured residual UPV ratio.

关键词： Residual strength Concrete High temperature Pulse velocity Post-fire-curing

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