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。
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 semilogarithm 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.
出处
《建筑结构》
CSCD
北大核心
2016年第15期56-59,共4页
Building Structure
基金
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)
关键词
树脂混凝土
大样本
疲劳
剩余刚度
统计分析
resin concrete
large sample
fatigue
residual stiffness
statistical analysis
