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通过四点弯曲试验,研究了冻融循环与持载对碳纤维增强复合材料(CFRP)加固高强钢筋混凝土梁变形性能的影响。分析了不同环境作用下试验梁的承载力、刚度及破坏形态变化规律。结果表明:在冻融循环单独作用下,试验梁的性能变化很小;冻融与持载耦合作用时,两者均对梁的性能造成不利影响,且随着冻融循环次数的增加,承受持载梁的CFRP-混凝土界面黏结性能有所下降;在冻融循环作用下,CFRP-混凝土界面存在应力时会增大界面的劣化程度,从而引起加固梁性能的下降。
Through the four-point bending test, the effect of freeze-thaw cycles and holding load on the deformability of CFRP-strengthened high-strength reinforced concrete beams was studied. The changing law of bearing capacity, stiffness and failure mode of the test beams under different environments are analyzed. The results show that under the single action of freeze-thaw cycle, the performance of the test beam changes little. When the freeze-thaw and the load-bearing coupling effect, both of them affect the performance of the beam adversely, and with the increase of the number of freeze-thaw cycles, The CFRP-concrete interfacial adhesion performance of the carrier beam is reduced. Under the effect of freeze-thaw cycles, the CFRP-concrete interfacial stress will increase the degree of interfacial degradation, resulting in the decrease of the performance of the reinforced beam.