有压水环境下循环荷载历史对饱和混凝土动态力学特性的影响

发布时间：2018-03-07 12:51

本文选题：循环荷载　切入点：饱和混凝土　出处：《土木建筑与环境工程》2017年06期 　论文类型：期刊论文

【摘要】：为研究有压水环境中循环荷载历史对混凝土动态力学性能的影响,对历经不同荷载循环次数(0、25、50、100次)的水饱和混凝土试件(在2 MPa围压水环境中)进行了不同应变速率(10-5、10-4、10-3、10-2/s)下的常规三轴静动态压缩试验,分析了混凝土材料的峰值应力、峰值应变、弹性模量、吸能能力等基本力学参数的变化规律和机理。结果表明:同一加载速率下,水饱和混凝土的峰值应力、弹性模量和吸能能力均随循环次数的增长呈现出先增大后减小的规律,并且峰值应力和吸能能力增减的转折点随着应变速率的提高而向荷载循环次数增大的方向平移,峰值应变整体上呈减小的趋势;相同荷载循环次数后,峰值应力、峰值应变和吸能能力随着加载速率的增大而逐渐增大,并且荷载循环次数越大,率效应越显著,弹性模量随着加载速率的增大而逐渐较小。
[Abstract]:In order to study the influence of cyclic load history on dynamic mechanical properties of concrete in pressurized water environment, The conventional triaxial static and dynamic compression tests at different strain rates (10 ~ (-5) ~ 10 ~ (-4) ~ 10 ~ (-3) ~ 10 ~ (-2) / s) of saturated concrete specimens (in 2 MPa confined water environment) have been carried out, and the peak stress and strain of concrete materials have been analyzed. The change law and mechanism of basic mechanical parameters, such as elastic modulus, energy absorption ability, etc. The results show that under the same loading rate, the peak stress of water-saturated concrete, The elastic modulus and energy absorption capacity increase first and then decrease with the increase of cycle times, and the turning point of peak stress and energy absorption capacity increase and decrease with the increase of strain rate, and the turning point of the increase of load cycle times shifts to the direction of increasing load cycle times with the increase of strain rate. The peak stress, peak strain and energy absorption capacity gradually increase with the increase of loading rate, and the greater the load cycle times, the more significant the rate effect, after the same load cycles, the peak stress, the peak strain and the energy absorption ability increase with the increase of loading rate. The elastic modulus decreases with the increase of loading rate.
【作者单位】：三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心土木与建筑学院;
【基金】：国家自然科学基金(51279092) 三峡大学研究生科研创新基金(SDYC2016018)~~
【分类号】：TU528

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