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通过对中度和重度劣化的钢筋混凝土梁黏贴碳纤维(CFRP)加固补强,研究混凝土劣化及钢筋锈蚀同时存在状况下加固梁正截面抗弯性能变化规律,探讨钢筋混凝土梁劣化程度、CFRP用量对加固效果的影响.结果表明:CFRP加固劣化梁正截面受弯时有CFRP拉断和CFRP黏结层剪断2种典型破坏模式;加载初期,加固梁承载力满足平截面假定,后期则不满足,且容易发生脆性破坏;位移延性系数μ_△随试验梁劣化程度增加而缓慢降低.破坏时,CFRP拉应变小于极限拉应变.结合试验结果和理论分析,有针对性地建立了与两类典型破坏模式相适应的加固梁正截面受弯承载力计算模型,分析了CFRP用量对加固效果的影响并提出了加固时机确定方法.
Through the reinforcement and reinforcement of moderately and severely deteriorated reinforced concrete beams bonded with carbon fiber (CFRP), the variation regularity of the flexural behavior of the reinforced beams under the condition of concrete deterioration and steel corrosion are discussed. The degradation degree of the reinforced concrete beams, the amount of CFRP The results show that there are two kinds of typical failure modes of CFRP tensile failure and CFRP adhesive layer shear failure in the bending of normal beam with CFRP reinforcement. In the initial stage of loading, the bearing capacity of the reinforced beam satisfies the assumption of flat section and is not satisfied in the later stage, And the brittle failure is easy to occur.The displacement ductility coefficient μ_ △ decreases slowly with the deterioration of the test beam.While the CFRP tensile strain is less than the ultimate tensile strain when the test beam is damaged, combining with the test results and theoretical analysis, Mode, the influence of CFRP dosage on the reinforcement effect is analyzed and the method to determine the reinforcement timing is proposed.