中文摘要：

通过6根足尺混凝土梁的抗弯加固试验，对内嵌CFRP板条加固梁的破坏过程、受力性能、截面应变分布和挠度变形规律进行了研究。试验结果表明，内嵌CFRP板条加固梁跨中截面应变分布和挠度变形规律与外贴CFRP加固梁相似，但内嵌加固能有效避免板条的剥离破坏，其抗弯加固性能优于相应的外贴加固梁；预载加固将会降低内嵌板条的加固效果。基于混凝土结构加固理论，并考虑预加荷载的影响，对内嵌CFRP板条加固梁3种弯曲破坏形态（钢筋屈服前混凝土压碎、钢筋屈服后混凝土压碎和钢筋屈服后FRP拉断）下的抗弯承载力进行理论分析，并建立开裂弯矩、屈服弯矩和极限弯矩的计算公式，其计算结果与作者及国内外已有的试验实测值吻合较好，可用于实际工程加固设计。

英文摘要：

Six full-size reinforced concrete （RC） beams were manufactured, and the flexural behaviors of the beams strengthened with near-surface mounted （NSM） CFRP laminates were investigated. The experimental results show that the strain distribution and deflection pattern of the NSM CFRP-strengthening beams is similar to that of the externally bonded CFRP-strengthening beams, but the former can prevent the laminate from peeling off more effectively and has more flexural capacity than the latter. In addition, the results also indicate that the pre-load on the beam reduces the increment of its flexural capacity. In consideration of the influence of pre-load, three bending failure modes （ concrete crush prior to steel yielding, concrete crush after steel yielding and FRP break after steel yielding） were discussed for NSM CFRP laminates-strengthened beams on the basis of the theory of concrete structure, and formulas were derived for the cracking moment, the yielding moment and the ultimate moment. The predicted results agree well with the measured values from the tests of the present and other studies.