基于细观模拟的碾压混凝土尺寸效应律研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (7) : 250-257.

论文

基于细观模拟的碾压混凝土尺寸效应律研究

魏培勇1，2，张社荣1，2，王超1，2，王枭华 1，2，和孙文3

作者信息 +

Size effect law of RCC based on mesoscopic simulation

WEI Peiyong1,2, ZHANG Sherong1,2, WANG Chao1,2, WANG Xiaohua1,2, HE Sunwen3

Author information +

文章历史 +

摘要

关于混凝土类材料准静态尺寸效应研究已经相对完善，然而受实验设备及条件限制较高应变率下混凝土材料的尺寸效应行为仍需进一步研究。同时作为组分特殊的一种混凝土材料，碾压混凝土动态尺寸效应研究对碾压混凝土坝抗冲击防护研究具有重要意义。将混凝土视为粗骨料、砂浆基质、界面过渡层组成的三相复合材料，建立了不同尺寸碾压混凝土圆柱形试件，对不同应变率下碾压混凝土压缩特性进行了模拟与分析。研究结果表明：与常态混凝土类似，动态荷载("ε" ̇">30/s" )下碾压混凝土尺寸效应行为与静态荷载下相反，即动态抗压强度随试件尺寸增长而增强；动态尺寸效应与应变率呈现相关性，应变率越高，动态尺寸效应越显著，这与碾压混凝土SHPB(the Split Hopkinson Pressure Bar)试验结果相验证；当应变率"ε" ̇"=1~30/s" 时，尺寸效应并不显著，不同尺寸试件的抗压强度相差不大；准静态荷载"ε" ̇"=1E-5/s" 下,碾压混凝土抗压强度随尺寸增加而降低。最后，基于Bazant尺寸效应对碾压混凝土尺寸效应律进行了量化分析。

Abstract

The research on quasi-static size effect of concrete materials has been relatively comprehensive. However, the size effect behavior of concrete materials under high strain rates needs further investigation, mainly due to the limitations of experimental equipment and conditions. Meanwhile, as a kind of concrete material with special components, the understanding of the dynamic size effect of roller compacted concrete is essential to better study of impact protection of roller compacted concrete dams. In this paper, concrete was regarded as a three-phase composite composed of coarse aggregate, mortar matrix and interface transition zone. Then roller compacted concrete cylindrical specimens with different sizes were established to simulate and analyze the compressive characteristics of RCC under different strain rates. The results show that, like the normal concrete, the size effect behavior of RCC under dynamic loads ("ε" ̇">30/s" ) is opposite to that under static loads. That is to say, the dynamic compressive strength increases with the increase of specimen size. The higher the strain rate is, the more significant the dynamic size effect is, which is verified by the SHPB test results of RCC. When the strain rate "ε" ̇"=1~30/s" , the size effect is not significant, and the compressive strength of different size specimens has little difference. Under quasi-static load ("ε" ̇"=1E-5/s" ), the compressive strength of RCC decreases with the increase of specimen size.

导出引用

魏培勇1，2，张社荣1，2，王超1，2，王枭华 1，2，和孙文3. 基于细观模拟的碾压混凝土尺寸效应律研究[J]. 振动与冲击, 2022, 41(7): 250-257

WEI Peiyong1,2, ZHANG Sherong1,2, WANG Chao1,2, WANG Xiaohua1,2, HE Sunwen3. Size effect law of RCC based on mesoscopic simulation[J]. Journal of Vibration and Shock, 2022, 41(7): 250-257

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