内嵌CFRP板条加固损伤预应力混凝土梁抗弯性能

为研究超载状态下内嵌CFRP板条加固损伤预应力钢筋混凝土梁的抗弯性能，对6根预应力钢筋混凝土梁进行了抗弯试验.研究了损伤加固梁的破坏形态、加固梁的承载能力和刚度，探讨了超载重复次数、超载幅值和负载加固对梁抗弯性能的影响.试验结果表明:与未加固梁相比，加固后梁的承载能力和抗弯刚度显著提高，极限承载力提高幅度在7%~15%之间;超载重复次数、超载幅值和负载加固对加固梁的极限承载力影响较小;超载幅值和负载加固影响加固梁的刚度;建立的承载力计算公式合理，与试验结果相符.

Flexural Performance of Damaged Prestressed Reinforced Concrete Beams Strengthened with Near Surface Mounted CFRP Strips

In order to investigate the flexural performance of damaged prestressed reinforced concrete(PRC) beams strengthened with near surface mounted(NSM) carbon fiber reinforced polymer(CFRP) strips under overloading， bending tests of six PRC beams were carried out. The failure mode， bearing capacity and stiffness of PRC beams strengthened with NSM CFRP strips were studied. The influences of the number of overloading cycles， overloading amplitude and sustaining load on the performance of strengthened beams were also evaluated. The experimental results indicated that compared with un-strengthened beam， the flexural capacity and stiffness of the strengthened beams can be enhanced obviously. The ultimate loads are increased by 7% to 15%. There are little influences on ultimate bearing capacity of the strengthened beams caused by the cycle number， the overload amplitude and the sustaining load， while the overload amplitude and the sustaining load affect the stiffness of the strengthened beams. A calculation formula of bearing capacity is established， and the theoretical values agree well with the experimental values.