Study On The Flexural Performance Of The Beams Strengthened By Aramid Fiber Reinforced Plastics

Strengthening existing reinforced concrete structures with externally that bonded Aramid Fiber Reinforced Plastic (AFRP) has been a new technology up in the developed countries since the end of 1980's. The use of AFRP sprung in the reinforcements of concrete structures has increased rapidly in the recent years in our country due to its excellent corrosion resistance, high tensile strength, and good non-magnetization and insulation properties.Study on Performance of the Beams Strengthened by Aramid Fiber Reinforced Plastics is making based on the flexural behavior of 3 groups of 21 beams strengthened by AFRP with under quadratic loading. And based on the test results, inferred the fragrant black silk ribbon textile fiber cloth to reinforce the reinforced concrete beam's right section anti-curved supporting capacity formula, the fragrant black silk ribbon textile fiber cloth reinforces the reinforced concrete beam's short-term rigidity as well as is bent the ductility simplification formula. Uses the above formula and the actual value contrast error is smaller, it may supply the actual reinforcement engineering when design refers.Finally,with the help of ANSYS,the influence on strengthening effect is analyzed with the parameters such as AFRP layers, steel percentage,preload,concrete.The results indicate that the bearing capacity of the specimen increased remarkably when strengthened with longitudinal FRP, reinforced beam's supporting capacity to increase along with the textile fiber cloth layer increase, but the supporting capacity enhances the degree not to assume the linear relations to the reinforcement layer; When glues the same layer the fragrant black silk ribbon textile fiber cloth, is reinforced the component steel percentage lowly, uses the effect which the fragrant black silk ribbon textile fiber cloth reinforces to be moreobvious; The lag strain size is decided two times of stress structures reinforcement effect key aspect, textile fibercloth lag strain bigger, is smaller to the supporting capacity enhancement, the test result indicated: The pre- increase regulation goes past in a big way, the lag strain is bigger; In order to reduce the lag strain, before the reinforcement should carry on the unloading as far as possible to the structure, only must unload to about original structure limit supporting capacity 40% can obtain the good effect.