The paper summarizes the results of experimented and analytical studies concerning the flexural strengthening of repaired rc beams even when considering the limitation of the re member due to its un - modifiable shear resistance , it is shown that the applications of cfrp reinforcement can considerably increase untimate load resistance capacity and deflection at service 将分析结果与试验结果进行比较后可以看出，即使不考虑粘贴cfrp片材对剪力的贡献，加固梁的极限承载力仍然得到显著提高。编制程序并绘制简单的流程图，通过计算实例可以证明这是一种能够应用于工程实践的设计方法。
At the same time , parametric analyses are conducted to investigate the effects of cfrp on strength , rigidity and failure mechanisms of repaired of rc beams . parameters considered are concrete compressive strength , percentage of flexural reinforcement , bonded length , thickness and stiffness of cfrp laminate and soon 同时讨论了各种参数对加固效果的影响，这些参数包括混凝土强度、配筋率、粘结长度、 cfrp厚度及刚度等，在设计过程中正确选择参数，可以避免加固梁发生脆性破坏。
3 ) the average - strain of cross - section still can be assumed to be keep - in - plane within the whole loading procedure ; the theoretical moment - curvatures obtained by the cross - section keep - in - plane is consistent with the experimental ones . 4 ) the analytical flexural bearing capacity and cfrp - strain are more accurate by assuming the concrete ultimate strain to be 0 . 07 instead of 0 . 0033 ; 5 ) limiting the cfrp - strain under 0 . 01 is reasonable to evaluate the flexural bearing capacity of rc beams retrofitted with cfrp ; 6 ) the initial load is hardly influence the flexural bearing capacity of cfrp - strengthened rc beams 取混凝土的极限压应变0 . 007代替0 . 0033进行计算的结果能更准确地评浙江大学硕士学位论文2004摘要价加固梁的抗弯承载力和cfrp应变; 5 .在计算cfrp加固梁的抗弯承载力时，限制cfrp的应变在0 . 01以内的措施是恰当的; 6 .梁所承受的荷载的大小对加固后梁的抗弯承载力影响不大。
In this paper , the mechanical performance of the initially loaded beams strengthened by cfrp were investigated . the loaded - bearing characteristics of the beams are discussed and the effect on the limited ability of resisting reflex of the initially loaded beams is given . this is very helpful for the practical design 本文还对二次受力碳纤维加固梁的受力性能进行了研究，提出了二次受力加固梁的受力特点，讨论了二次受力对加固梁极限承载能力的影响，为实际工程设计提供了有力的理论指导。
Introducing beam ' s secondary load theory , a series of integrated calculated formula and a designed example that calculate the area of bonded material for strengthening reinforced beams under the secondary load . the bonded - strengthened beams " cracked - moment and yielded - moment can be accurately calculated by introducing the improved algorithm of moment - curvature to paper ' s program 同时，本文根据受弯加固构件的二次受力理论，提出了一整套较为完整的粘贴加固梁在二次受力情况下的正截面承载力计算公式，并给出相应的工程实例计算。
