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碳纤维增强复合材料(CFRP)加固钢结构在实际工程中,往往遭受到湿热环境的影响而导致加固结构失效。通过对8个钢与CFRP板搭接接头试件的拉伸试验,分析干湿循环对钢和CFRP黏结界面的破坏模式和极限荷载的影响。试验结果显示:钢和CFRP板的搭接接头在干湿循环的影响下会显著降低其抗拉承载力,干湿循环90次后试件承载力趋于稳定;通过理论计算式推算出最大界面主应力试验结果与理论计算结果的偏差在15%以内,验证了理论计算式的准确性。
In the practical project, CFRP reinforced steel structures often suffer from damp and hot environment and lead to the failure of reinforced structure. Through the tensile test of eight steel and CFRP plate lap joint specimens, the influence of the wetting and drying cycle on the failure mode and ultimate load of the steel and CFRP bonding interface was analyzed. The experimental results show that the lap joints between steel and CFRP plate significantly reduce the tensile load capacity under the influence of the wetting and drying cycles. The bearing capacity of the specimens tends to be stable after 90 cycles of dry-wet cycles. The maximum interface The deviation of the main stress test result from the theoretical calculation result is within 15%, which verifies the accuracy of the theoretical calculation formula.