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The research aspects are mainly from the load and cycle times and material strain, crack propagation analysis of the circumstances of CFRP reinforcement of prestressed concrete beam performance of the contribution of low cycle; 1.2 By comparing the experiment, one purpose is to test the increasing degrees that different amount of carbon fiber reinforced prestressed concrete beams on their strength and flexural cyclic life under cyclic loading increased the degree; 1.3 By comparing the experiment, another purpose is to test the performance difference that damage reinforced beam and reinforcement beams good cyclic. 2 Specimens produced 2.1 Specimen Design The experiments were designed in four section size, reinforcement of the same specimen, and concrete design strength grade of C40.
Ltd. with concrete to provide the CFS2-3.55-220-017-150 Carbon Fiber (for beam bottom) and CFS-3.55-220-012-100-based carbon fiber (used as U-shaped hoop), manufacturer of the material parameters given in Table 1.
References [1] DENG Lang-ni，ZHANG Peng，YAN Liu-bin，et al．Construction technology and test research of reinforcement concrete beams strengthened with prestressed CFRP plates [J]．CONCRETE．2009(8)：117-119．In Chinese [2]FANG Zhi，YANG Jian．Behaviors of Concrete T-beams Prestressed with CFRP Tendons under Cyclic Loading [J] ．Journal of the China railway Society．2006，28(1)：72-79．In Chinese [3]Ou Jinping，Wang Bo，He Zheng．MECHANICAL BEHAVIOR OF CONCRETE BEAMS REINFORCED WITH CFRP BARS [J] ．China Civil Engineering Journal．2005，38(2)：8-12，31．In Chinese [4]QIAN Wei，GAO Dan-ying．Effect of initial damage on the flexural performance of reinforced concrete beams strentthed of cfrp sheets [J] ．Building Science Research of Sichuan．2006，32(4)：45-49．In Chinese [5]RU Hai-feng，ZHANG Qian，LIANG Chun-xiang．Experimental Research on the Fatigue Rigidity of RC Beams Reinforced by CFRP Sheets [J] ．Journal of Railway Engineering Society．2008(6)：52-55．In Chinese [6] XUE Wei-chen，QIAN Wei．Study of Fatigue Behaviors
of Partially Prestressed Concrete Beams with CFRP Tendons [J] ．China Journal of Highway and Transport．2008，21(2)：43-48．In Chinese [7] ZHANG Yan，XU Zhi-sheng．Research of flexurai behavior of fire-damaged reinforced concrete beams strengthened with CFRP [J]．Journal of Xi'an University of Architecture & Technology．2008，40(1)：40-45．In Chinese

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