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CFRP Board Pre-stressed Reinforcement Craft Correlation Testing Research

Author: MaSong
Tutor: QuanXueYou
School: Chongqing University
Course: Structural Engineering
Keywords: Shear pressure composite test Friction test Coefficient of friction Cylindrical wedge-shaped fixture
CLC: TU375.1
Type: Master's thesis
Year: 2010
Downloads: 46
Quote: 0
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Abstract


Carbon fiber as a new type of high-strength, high-performance structural materials in the field of civil engineering existing applications, in particular, has a great prospect in engineering structural reinforcement. But there are many problems and defects flexural strengthening using the ordinary paste CFRP sheet: low utilization rate of CFRP material strength, reinforced with CFRP material only in the reinforcement member secondary Loaded further deformation occurs gradually participatory role . In order to better play out the characteristics of high-strength CFRP materials as well as to solve the above problems, the best way is to prestressed CFRP materials, the formation of similar external prestressing CFRP prestressed system is applied to the reinforcement works. Our group pre-research and development of a CFRP plate prestressing system used in the field of structural reinforcement, this article analyzed the pre-test the success of gains and losses in the pre-test study on the basis of the task group, and do test research, its main contents are as follows: ① normal stress between shear strength and shear pressure the composite test test colloid, and the plastic sheet to work together on it. ② analyzed the drawbacks of the various fixtures and determine the type of pre-research and development fixture. ③ design by friction test test test the carbon fiberboard surface friction coefficient, and on this basis fixture. ④ by test test fixture the limit clamping force holding charge capacity. Has completed a series of tests, through analyzes of test results the following conclusions: ① appropriate normal stress can improve the performance of shear colloid as well as the plastic sheet to work together. ② wedge grips can solve the fixture internal Shouli Bu the problem, and to overcome the previous fixture construction cycle is long, complex defects. ③ come to the the carbon fiberboard surface friction coefficient can be set at 0.3. ④ cylindrical wedge grips can effectively test CFRP plate prestressed friction test. The clamps are small size, simple operation. Tension test carbon fiber to establish the maximum tensile stress reached 2483MPA, the maximum tensile force of 149KN. These conclusions are combined with theoretical analysis and conclusions through a series of tests phenomenon obtained from the macro-law has caught the essence of the problem, the more accurate interpretation of experimental phenomena and undermine the principle, subject to further study in the future to provide the necessary experimental and theoretical analysis based on .

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