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全珊瑚混凝土的疲劳特性
作者:马林建1 陈欣星1 赵跃堂1 刘基程2 
单位:(1. 陆军工程大学国防工程学院 爆炸冲击防灾减灾国家重点实验室 南京 210007  2. 南京理工大学理学院 南京210094) 
关键词:全珊瑚混凝土 疲劳 上限应力-疲劳寿命曲线 变形 频率 
分类号:U416.2
出版年,卷(期):页码:2019,47(2):0-0
DOI:10.14062/j.issn.0454-5648.2019.02.09
摘要:

 全珊瑚混凝土由珊瑚粗骨料、珊瑚砂细骨料、水泥、减水剂和海水拌合而成。为研究加载上限应力水平和频率对全珊瑚混凝土疲劳寿命和疲劳变形的影响,利用MTS电液伺服疲劳试验机对100 mm×100 mm×100 mm立方体试块进行单轴抗压疲劳试验,得到了上限应力-疲劳寿命S-N曲线方程、循环应力-应变曲线及残余应变-循环次数曲线。结果表明:珊瑚混凝土的疲劳极限为0.652,疲劳寿命要高于普通混凝土和轻集料混凝土,且受加载频率影响较普通混凝土更为显著。疲劳极限残余应变随着上限应力和频率的提高而略有增加,稳态变形速率随上限应力的提高或频率的降低逐渐增大。疲劳三阶段变形中,稳态阶段对数应变率与对数疲劳寿命呈现较好的线性相关性。珊瑚混凝土的疲劳破坏模式主要为劈裂破坏,破裂面往往贯穿珊瑚骨料。

 The coral aggregate concrete is made up of coarse aggregate coral, fine aggregate coral sand, cement, water reducer and seawater. In order to investigate the effect of loading maximum stress level and frequency on the fatigue life and fatigue deformation of coral concrete, a uniaxial compressive fatigue test was performed on cubic test blocks with the sizes of 100 mm×100 mm ×100 mm in an MTS electro-hydraulic servo fatigue test machine. The stress-number of cycles to failure (S-N) fatigue life equation, cyclic stress-strain curve and residual strain-cycle number curve were obtained. The analysis shows that the fatigue limit of coral concrete is 0.652, and the fatigue life is greater than that of ordinary concrete and lightweight aggregate concrete, and the effect of loading frequency is more dominant rather than ordinary concrete. The fatigue limit residual strain increases slightly with the increase of the maximum stress and frequency, and the steady state deformation rate increases with the increase of the maximum stress or the decrease of the frequency. In the fatigue three-stage deformation, the logarithmic strain rate of the steady-state stage is linearly related to the logarithmic fatigue life. The fatigue failure mode of coral concrete is mainly the splitting failure, and the fracture surface often runs through coral aggregate.

基金项目:
国家自然科学面上基金资助项目(51774295,51808551)。
作者简介:
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