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Bridges throat as transportation is critical to ensure the smooth flow of road across the board, does not meet the requirements for the bridge, through the adoption of effective measures Retrofitting reinforcement to improve the carrying capacity of the bridge, extending its useful life, to make it meet the growing of traffic demand, with important economic and social benefits. Prefabricated Prestressed Concrete Hollow Slab is our country, the small bridge span bridges commonly used for carrying capacity of prestressed concrete slab bridge insufficient research using CFRP Hollow Slab technology has a high theoretical value and greater practical value. In this paper, the finite element software Midas / FEA, for ordinary and prestressed CFRP CFRP Prestressed Concrete Hollow Slab capacity by numerical simulation analysis, the completion of the main work and the main conclusions: 1. Using ordinary carbon fiber cloth and prestressed CFRP Prestressed Concrete Hollow Slab, reinforced concrete hollow slab strand and the stress has decreased significantly reduced hollow deflection, cracks in the development of the cross-section height significantly reduced, cracks Although the increase in the number, but the reinforcement can be effectively suppressed after the development of cracks, the crack spacing smaller distribution. CFRP prestressed hollow slab than ordinary hollow CFRP, CFRP assumed stress increased significantly. (2) using CFRP prestressed hollow Itabashi, because carbon fiber hollow force in greater strain than before, so when the hollow began to bear live loads, the CFRP can immediately participate in the work and to play a greater role , as opposed to ordinary carbon fiber, high strength prestressed CFRP advantage to play. 3 by CFRP Prestressed Concrete Hollow Slab ultimate bearing capacity of the whole process of numerical analysis based on hollow reinforced front and rear load factor ~ strand, CFRP strain curve indicated strand before yielding, CFRP and strand strain with load increases, the two together by force; strand after yielding, CFRP is more significant role. 4 ordinary and prestressed CFRP CFRP Prestressed Concrete Hollow Slab ultimate strength analysis of the whole process of numerical simulation results show that both methods can improve the yield hollow ultimate load, for the ultimate bearing capacity, pre- stress than ordinary CFRP CFRP raise bigger.
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