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纤维复合材料(FRP)-混凝土最大粘结滑移量(δu)的实测一直是个难题。为克服这一难题,作者先分析既有实验研究方法的优缺点,进而设计了一种可稳妥测量δu的“双拉试件”。其后又提出了改进引伸计、并用其直接测量δ的简单新方法,并说明其可靠性。经试验研究,提出了δu的确定方法。测试实例显示,在文中实验条件下,δu为0.405~0.515 mm。
Fiber composite material (FRP) - Measurement of maximum bond slip (δu) of concrete has always been a challenge. To overcome this problem, the author first analyzes the advantages and disadvantages of the existing experimental research methods, and then designs a “double-pull test specimen” that can measure δu steadily. Later, a new and simple method to improve the extensometer and use it to measure δ directly was given and its reliability was demonstrated. After experimental study, the method of determining δu is proposed. The experimental results show that δu is 0.405 ~ 0.515 mm under the experimental conditions in this paper.