早龄期混凝土动强度应变率系数的统计方法  

Statistical Method for Strain Rate Coefficients of Dynamic Strength of Early-age Concrete

作　　者：谢立栋[1,2] 东兆星 姜慧 朱炯[1] 齐燕军[2] XIE Lidong;DONG Zhaoxing;JIANG Hui;ZHU Jiong;QI Yanjun(School of Civil Engineering,Xuzhou Institute of Technology,Xuzhou,221018,Jiangsu,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]徐州工程学院土木工程学院,江苏徐州221018 [2]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《兵工学报》2021年第S01期159-166,共8页Acta Armamentarii

基　　金：国家“十三五”重点研发计划项目(2016YFC0600904);中建材联结基金资助项目(2016-m-1);徐州工程学院重点培育项目(XKY2011106)。

摘　　要：早龄期混凝土动强度应变率系数是各类动态本构模型的基础参数,该系数随龄期的定量算式尚欠缺。针对该问题,在文献[9]开展的C40混凝土1 d、2 d、3 d、4 d、5 d、6 d试件的霍普金森压杆冲击实验结果基础上,结合其他研究者的C40冲击实验成果进行研究,发现相同强度不同研究者得出的结果虽然整体趋势相似,但是相同龄期数值差距较大。为有效消除由试件尺寸、实验设备、混凝土自身复杂性等因素带来的误差,根据各研究者优势龄期区间等权重插值,利用等权重互插方法弥补冲击龄期样本少的缺陷,既丰富龄期样本参数,又回归出动强度应变率效应系数对龄期的定量算式,满足工程实际需求。该方法具有通用性和开放吸收性,对其他强度等级混凝土同样适用,后续研究者补充实验数据后,可以进一步精确所得研究结论。The strain rate effect coefficient of dynamic strength of early-age concrete is a basic parameter of various dynamic constitutive models,and the quantitative formula of this coefficient with age is still lacking.Based on SHPB impact test results of 1 d,2 d,3 d,4 d,5 d and 6 d specimens of C40 concrete in Ref.[9],the test results were compared with those in other Refs.It finds that the numerical values of specimens with the same age are quite different although the research conclusions from different researchers on the same strength grade concrete are roughly similar.In order to effectively eliminate the errors caused by specimen size,experimental equipment,complexity of concrete itself and other factors,the equal weight interpolation method is used to offset the small number of element samples in the impact age according to the different dominant age intervals.The proposed method can be used not only to increase the number of element samples of all age,but also regress the quantitative formula of dynamic strength strain rate effect coefficient with age,which can meet the needs of engineering application.The proposed method has both versatility and open absorption,and is also applicable to other strength grades of concrete.The conclusion in this paper can be further optimized with the supplement of later experimental data.

关 键 词：早龄期混凝土 动强度 应变率效应 霍普金森压杆 等权重互插 

分 类 号：O347.3[理学—固体力学]