【摘要】 为了得到抗剪钢筋约束下钢桥面铺装层界面剪切疲劳预估模型，制作有、无抗剪钢筋的复合试件并以温度和应力为变量进行斜剪疲劳试验。重点分析了环境温度、应力比及抗剪钢筋对抗剪钢筋约束下钢桥面铺装层界面剪切疲劳寿命的影响规律以及不同温度下的破坏模式，同时依据应力与剪切疲劳寿命线性相关性，以温度修正的方法构建了抗剪钢筋约束下钢桥面铺装层界面剪切疲劳预估模型。结果表明：抗剪钢筋显著提升钢桥面沥青铺装层间剪切疲劳寿命，其约束效应随应力水平增大而增强；应力比为0.2和0.6时，有筋试件疲劳寿命较无筋试件平均提升1.2倍和3倍以上，50℃高温环境下的提升效果可达2倍和5倍；温度对层间剪切疲劳性能影响显著，25℃为疲劳寿命衰减的关键转折点；-10～25℃区间内，试件疲劳寿命损耗速率平缓，且随应力比增大损耗加剧；25～60℃区间内，试件疲劳寿命损耗速率显著加快，微观上表现为混合料表面泛油、裂纹扩展模式从“居中式”转为“覆盖式”,破坏程度加剧；相同温度下，疲劳寿命随应力增加呈下降趋势；剪切疲劳寿命预估模型在不同温度范围内的数据拟合误差均在10%以内，表明模型涵盖温度范围广且精确度较高。更多还原

【Abstract】 In order to obtain the shear fatigue prediction model for steel bridge deck pavement interface under shear reinforcement constraints, composite specimens with and without shear reinforcement were fabricated and tested with temperature and stress as variables for oblique shear fatigue test. The influence of ambient temperature, stress ratio and shear reinforcement on the shear fatigue life of steel bridge deck pavement interface restrained by shear reinforcement and the damage modes under different temperatures were analyzed, and the shear fatigue prediction model of steel bridge deck pavement interface restrained by shear reinforcement was constructed with temperature correction based on the linear correlation between the stress and the shear fatigue life. The results show that the shear reinforcement significantly improves the interface shear fatigue life of asphalt pavement on steel bridge deck, and its constraint effect increases with the increase of stress level. When the stress ratio is 0.2 and 0.6, the fatigue life of the reinforced specimens is 1.2 times and 3 times higher than that of the unreinforced specimens, and the improvement effect under high temperatures of 50 ℃ can reach 2 times and 5 times. Temperature has a significant effect on the interface shear fatigue performance, and 25 ℃ is the key turning point for the attenuation of fatigue life. In the range of-10 ℃ to 25 ℃, the fatigue life loss rate of the specimen is gentle, and the loss increases with the increase of stress ratio. In the range of 25 ℃ to 60 ℃, the fatigue life loss rate of the specimen is significantly accelerated. Microscopically, the surface of the mixture is oiled and the crack propagation mode changes from centring type to cover type, and the damage degree is aggravated. Under the same temperature, the fatigue life decreases with an increase in stress. The data fitting error of the shear fatigue life prediction model in different temperature ranges is within 10 %, indicating that the model covers a wide temperature range and has high accuracy.更多还原