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（1 南京理工大學(xué)土木工程系， 南京 210094； 2 南京理工大學(xué)材料科學(xué)與工程學(xué)院， 南京 210094)

［摘要］為了研究高強(qiáng)樹脂混凝土的疲勞損傷性能，開展了大樣本條件下的高強(qiáng)樹脂混凝土彎拉疲勞試驗(yàn)。通過疲勞統(tǒng)計(jì)分析，獲得了單對(duì)數(shù)S-N曲線、雙對(duì)數(shù)S-N曲線、疲勞極限、威布爾形狀參數(shù)及尺度參數(shù)。結(jié)果表明，高強(qiáng)樹脂混凝土疲勞壽命符合威布爾分布規(guī)律；其剩余剛度（動(dòng)態(tài)模量）初始階段下降較快，中間過程下降較為緩慢，試件斷裂前則突然降低，具有明顯的“突然死亡”現(xiàn)象；建立的高強(qiáng)樹脂混凝土剛度退化模型具有較好的預(yù)測(cè)性。

［關(guān)鍵詞］樹脂混凝土； 大樣本； 疲勞； 剩余剛度； 統(tǒng)計(jì)分析

中圖分類號(hào)：TU377-4文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*國(guó)家自然科學(xué)基金（51308297），國(guó)家科技重大專項(xiàng)（2012ZX04010-032），江蘇省普通高校研究生科研創(chuàng)新計(jì)劃項(xiàng)目（KYXL_0388）。

作者簡(jiǎn)介：孫巍巍，副教授，碩士研究生導(dǎo)師，Email:sww717@163.com。