混凝土材料动态压缩强度的应变率强化规律

发布时间：2018-05-28 08:48

本文选题：混凝土 + 应变率效应　；参考：《高压物理学报》2017年03期

【摘要】：混凝土材料的动态压缩强度具有明显的应变率效应,而且在低、高应变率下压缩强度的动态强化因子(Dynamic Increase Factor,DIF)与应变率的关系具有明显的区别。参考近30余年相关文献中大量的混凝土动态压缩实验数据,结合理论分析,探讨了在不同应变率阶段混凝土压缩强度DIF的变化规律,分析准静态压缩强度对压缩强度DIF的影响规律。最后对实验结果进行拟合,得到混凝土材料在不同应变率区间内压缩强度DIF的预测表达式。研究表明:混凝土材料的压缩强度DIF随着应变率的增加呈递增趋势,具有相似的线性关系;压缩强度DIF曲线按照斜率变化分为3个阶段,且在高应变率下斜率最大;不同准静态压缩强度的混凝土DIF随应变率变化的规律有少许区别,但它们之间没有明显的界限,DIF随应变率递增的趋势与准静态压缩强度没有明显的联系。
[Abstract]:The dynamic compressive strength of concrete material has obvious strain rate effect, and the relationship between dynamic Increase factor and strain rate is obviously different at low and high strain rate. Referring to a large number of experimental data of concrete dynamic compression in recent 30 years, and combining with theoretical analysis, the variation law of concrete compressive strength (DIF) in different strain rate stages is discussed. The effect of quasi-static compressive strength on compressive strength DIF is analyzed. Finally, the experimental results are fitted to obtain the DIF expression of compressive strength of concrete materials in different strain rate regions. The results show that the compressive strength (DIF) of concrete material increases with the increase of strain rate, and the compressive strength DIF curve is divided into three stages according to the slope change, and the slope is the largest at high strain rate. There are some differences in the variation of DIF with strain rate for concrete with different quasi-static compressive strength, but there is no obvious limit between them. There is no obvious relation between the increasing trend of DIF with strain rate and the quasi-static compressive strength.
【作者单位】：南京理工大学机械工程学院;
【基金】：国家自然科学基金(11472008,11202206) 中国博士后科学基金(2011M501057) “力学”浙江省重中之重学科开放基金(xklx1513) 中央高校基本科研业务费专项资金(30915118801)
【分类号】：TU528

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