（1 南京理工大学土木工程系， 南京 210094； 2 南京理工大学材料科学与工程学院， 南京 210094)

［摘要］为了研究高强树脂混凝土的疲劳损伤性能，开展了大样本条件下的高强树脂混凝土弯拉疲劳试验。通过疲劳统计分析，获得了单对数S-N曲线、双对数S-N曲线、疲劳极限、威布尔形状参数及尺度参数。结果表明，高强树脂混凝土疲劳寿命符合威布尔分布规律；其剩余刚度（动态模量）初始阶段下降较快，中间过程下降较为缓慢，试件断裂前则突然降低，具有明显的“突然死亡”现象；建立的高强树脂混凝土刚度退化模型具有较好的预测性。

［关键词］树脂混凝土； 大样本； 疲劳； 剩余刚度； 统计分析

中图分类号：TU377-4文献标识码：A文章编号：1002-848X(2016)15-0056-04

Experiment research on bending-tensile fatigue damage performance of high-strength resin concrete

Sun Weiwei1, Lu Sai1, Zhang Yuan1, Cui Chong2

(1 Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; 2 School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

Abstract:In order to investigate the fatigue damage performance of high-strength resin concrete, bending-tensile fatigue tests based on the condition of large samples were conducted. The fatigue statistical analysis was conducted to obtain semi-logarithm S-N curve, dual-logarithm S-N curve, fatigue limit, Weibull shape parameter and scale parameter. The results show that the fatigue lifetime distribution of high-strength resin concrete confirms to Weibull distribution law. The residual stiffness (dynamic modulus) of high-strength resin concrete under fatigue loading decreases rapidly in the initial loading stage and decreases slowly in the intermediary stage. However, it experiences a significant decay rapidly approximating to the ultimate failure stress, resulting in a clear sudden failure. The established stiffness degradation model of high-strength resin concrete has a good predictive ability.

Keywords:resin concrete; large sample; fatigue; residual stiffness; statistical analysis

*国家自然科学基金（51308297），国家科技重大专项（2012ZX04010-032），江苏省普通高校研究生科研创新计划项目（KYXL_0388）。

作者简介：孙巍巍，副教授，硕士研究生导师，Email:sww717@163.com。