循环荷载后围压水对混凝土力学特性影响
发布时间：2019-01-16 07:32
【摘要】：对不同围压(0,2,5,10MPa)下的水饱和混凝土试件,历经25次循环荷载作用后(荷载下限140kN,上限260kN,频率0.1Hz),进行了不同加载速率(地震荷载作用下的混凝土应变速率响应范围10~(-5)/s~10~(-2)/s)下的静动态常三轴抗压性能试验。分析了混凝土峰值应力、峰值应变以及损伤特性。结果表明:历经循环荷载后,随着加载速率的增加,混凝土峰值应力增大,峰值应变整体上逐渐增大,损伤变量D增长速度减缓;随着围压增加,混凝土峰值应力和峰值应变逐渐增大,损伤变量D增长速度降低,但损伤极限差值越来越大。基于上述试验结果,得到了历经荷载循环后混凝土动态峰值应力与围压、加载速率有关的经验计算式及历经荷载循环后混凝土动态峰值应变与围压、加载速率有关的经验式。
[Abstract]:Water saturated concrete specimens under different confining pressures (0 ~ 2 ~ 5 ~ 5 ~ 10 MPA) were subjected to 25 cycles of cyclic loading (the lower limit of the load was 140 KN, the upper limit of 260 KN, the frequency of 0.1Hz). The static and dynamic triaxial compression tests of concrete under different loading rates (the strain rate response range of 10 ~ (-5) / sg ~ (-2) / s) have been carried out. The peak stress, peak strain and damage characteristics of concrete are analyzed. The results show that after cyclic loading, with the increase of loading rate, the peak stress of concrete increases, the peak strain increases gradually, and the growth rate of damage variable D slows down. With the increase of confining pressure, the peak stress and strain of concrete gradually increase, and the growth rate of damage variable D decreases, but the difference of damage limit becomes larger and larger. Based on the above experimental results, the empirical formulas of dynamic peak stress and confining pressure, loading rate and dynamic peak strain, confining pressure and loading rate of concrete after cyclic loading are obtained.
【作者单位】： 三峡地区地质灾害与生态环境湖北省协同创新中心;三峡大学土木与建筑学院;
【基金】：国家自然科学基金资助项目(51279092,51309143) 三峡大学研究生科研创新基金资助项目(SDYC2016027)
【分类号】：TV431
本文编号：2409597
[Abstract]:Water saturated concrete specimens under different confining pressures (0 ~ 2 ~ 5 ~ 5 ~ 10 MPA) were subjected to 25 cycles of cyclic loading (the lower limit of the load was 140 KN, the upper limit of 260 KN, the frequency of 0.1Hz). The static and dynamic triaxial compression tests of concrete under different loading rates (the strain rate response range of 10 ~ (-5) / sg ~ (-2) / s) have been carried out. The peak stress, peak strain and damage characteristics of concrete are analyzed. The results show that after cyclic loading, with the increase of loading rate, the peak stress of concrete increases, the peak strain increases gradually, and the growth rate of damage variable D slows down. With the increase of confining pressure, the peak stress and strain of concrete gradually increase, and the growth rate of damage variable D decreases, but the difference of damage limit becomes larger and larger. Based on the above experimental results, the empirical formulas of dynamic peak stress and confining pressure, loading rate and dynamic peak strain, confining pressure and loading rate of concrete after cyclic loading are obtained.
【作者单位】： 三峡地区地质灾害与生态环境湖北省协同创新中心;三峡大学土木与建筑学院;
【基金】：国家自然科学基金资助项目(51279092,51309143) 三峡大学研究生科研创新基金资助项目(SDYC2016027)
【分类号】：TV431
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