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Experimental Study and Analysis of Secondary Load for the Beams Strengthened with Prestressed CFRP Sheets

Author: YangQiong
Tutor: HuangYin
School: Chongqing University
Course: Structural Engineering
Keywords: Wave-shaped-teeth-grip anchor prestressed CFRP sheet strengthen secondary load
CLC: TU375.1
Type: Master's thesis
Year: 2009
Downloads: 125
Quote: 5
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Abstract


CFRP (Carbon Fiber Reinforced Polymer) strengthens construction, which used abroad in recent years with the advantages of constructing conveniently, cycle short, not increasing dead load. However, bonding failure premature will occur between CFRP and member if the CFRP is plasted straight. At the same time, the CFRP’s intensity will not exert sufficiently and do not improve the normal serviceability of structure. Especially, in actural strengthening projects, the strengthened members always beard initial loads, when strengthened using common CFRP, the strain of CFRP will lag behind strain of steel in the course of secondary load, so that the strengthening effect is not so obvious. Hence, the strengthening’s technique of CFRP prestressed has very important value.Three T-section beams with the same size and steel bars are strengthened with different methods. Through the comparative experiments, the strengthening effects with wave-shaped-teeth-grip anchor and prestressed CFRP sheets are studied, and the influences of secondary load are discussed. Test results indicate that the intensity of CFRP sheets prestressed by WSGG will exert completely; the wave-shaped-teeth-grip anchors can anchor the CFRP sheets reliably even under high-level stress. Comparing with the normal CFRP strengthening, reinforcement by prestressed CFRP can choose CFRP’s amount to meet different requirement. Meanwhile, comparing with the primal load beam, the secondary load has a little reduction on the yield load and deformation performance.Based on the research of the test, and by reference to the theory of external prestressing structure, the ultimate flexural capacity of RC beams strengthened with CFRP sheet prestressed by WSGG out of the beam is analyzed. The result shows that the test beam strengthened by prestressed CFPR sheet can be analyzed with the theory of external prestressing structure.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures > Girder
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