陈徐东,杨瀚清,石丹丹,张锦华,丁凯

• 1:河海大学土木与交通学院
• 2:东南大学混凝土及预应力混凝土教育部重点实验室
• 3:东南大学爆炸安全防护教育部工程研究中心
• 4:东南大学土木工程学院

摘要(Abstract)：

考虑高径比、缝径比和直径三种尺寸效应对混凝土轴拉力学特性的影响,针对8种不同尺寸的预制裂缝圆柱形混凝土试件开展了轴拉试验。结合声发射无损监测技术,分析了轴拉工况下混凝土内部声信号参数的变化特征,探究了混凝土试件的轴拉力学特性和尺寸效应。研究结果表明:混凝土的轴拉损伤机制受尺寸效应的影响,轴拉工况下试件声发射累计振铃计数随着缝径比的减小和直径的增大而增大,平均峰值频率随高径比的减小和缝径比的增大而增大。不同尺寸混凝土试件的声发射信号在各幅度波段的分布特征基本一致,b值主要在0.8～2.0范围区间内。除此以外,声发射总能量随试件高径比和缝径比的增大而减小,随试件直径的增大而增大,并构建了不同高径比、缝径比和直径混凝土尺寸效应与声发射总能量的关系式。

关键词(KeyWords)： 混凝土;轴拉试验;尺寸效应;振铃计数;峰值频率;幅度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51979090);; 江苏省自然科学优秀青年基金项目(BK20190075);; 中国科协青年人才托举项目(2017QNRC001)

作者(Author): 陈徐东,杨瀚清,石丹丹,张锦华,丁凯

DOI: 10.13928/j.cnki.wrahe.2021.11.022

参考文献(References)：

• [1] 花幼星，侯超，韩林海.氯离子腐蚀环境下钢管混凝土轴拉构件受力性能研究[J].工程力学，2015 (S1):159-162.HUA Youxing,HOU Chao,HAN Linhai.Study on mechanical properties of concrete filled steel tubular members under chloride corrosion[J].Engineering Mechanics,2015 (S1):159-162.
• [2] GUO Y,CHEN X.Experimental study on direct tension behavior of concrete through combined digital image correlation and acoustic emission techniques[J].Structural Concrete,2019(7):1-14.
• [3] 李冬，金浏，杜修力，等.骨料级配对二维模型混凝土单轴抗拉强度影响的理论研究[J].工程力学，2017 (6):75-83.LI Dong,JIN Liu,DU Xiuli,et al.Theoretical study on the influence of aggregate gradation on the uniaxial tensile strength of two-dimensional model concrete[J].Engineering Mechanics,2017 (6):75-83.
• [4] CHEN X,BU J.Experimental study on direct tensile behavior of concrete under various loading regimes[J].ACI Materials Journal,2016,113(4):513-522.
• [5] 胡钰泉，胡少伟，黄逸群，等.不同张口位移速率下带裂缝混凝土轴拉试验研究[J].振动与冲击，2019,38(2):184-188.HU Yuquan,HU Shaowei,HUANG Yiqun,et al.Experimental study on uniaxial tension of concrete with cracks under different opening displacement rates[J].Vibration and Shock,2019,38(2):184-188.
• [6] LI Q,ZHANG F,ZHANG W,et al.Fracture and tension properties of roller compacted concrete cores in uniaxial tension[J].Journal of Materials in Civil Engineering,2002,14(5):366-373.
• [7] WEIBULL W.Wide applicability[J].Journal of Applied Mechanics,1951,103(730):293-297.
• [8] BAZANT Z.Size effect in blunt fracture:concrete,rock,metal[J].Journal of Engineering Mechanics,1984,110(4):518-535.
• [9] CARPINTERI A,CHIAIA B.Multifractal nature of concrete fracture surfaces and size effects on nominal fracture energy[J].Materials and Structures,1995,28(8):435-443.
• [10] 苏捷，莫衍，刘伟.混凝土三轴抗压强度尺寸效应试验研究[J].铁道科学与工程学报，2020,17(2):358-363.SU Jie,MO Yan,LIU Wei.Experimental study on size effect of triaxial compressive strength of concrete[J].Journal of Railway Science and Engineering,2020,17(2):358-363.
• [11] 陈鹏，王玉银，刘昌永，等.圆钢管混凝土轴压性能尺寸效应试验研究[J].建筑结构学报，2017,38(S1):249-257.CHEN Peng,WANG Yuyin,LIU Changyong,et al.Experimental study on size effect of concrete filled steel tube under axial compression[J].Journal of Building Structure,2017,38(S1):249-257.
• [12] 金浏，余文轩，杜修力，等.基于细观模拟的混凝土动态压缩强度尺寸效应研究[J].工程力学，2019,36(11):50-61.JIN Liu,YU Wenxuan,DU Xiuli,et al.Study on size effect of dynamic compressive strength of concrete based on meso simulation[J].Engineering Mechanics,2019,36(11):50-61.
• [13] XU J,FU Z,HAN Q,et al.Micro-cracking monitoring and fracture evaluation for crumb rubber concrete based on acoustic emission techniques[J].Structural Health Monitoring,2018,17(4):946-958.
• [14] KRAVCHUK R,LANDIS E N.Acoustic emission-based classification of energy dissipation mechanisms during fracture of fiber-reinforced ultra-high-performance concrete[J].Construction and Building Materials,2018,176:531-538.
• [15] 邓朝福，刘建锋，陈亮，等.不同含水状态花岗岩断裂力学行为及声发射特征[J].岩土工程学报，2017,39(8):1538-1544.DENG Chaofu,LIU Jianfeng,CHEN Liang,et al.Fracture mechanical behavior and acoustic emission characteristics of granite in different water-containing states[J].Chinese Journal of Geotechnical Engineering,2017,39(8):1538-1544.
• [16] 范向前，刘决丁，胡少伟，等.中央带裂缝混凝土循环拉伸断裂试验Felicity效应[J].复合材料学报，2019,36(12):2968-2974.FAN Xiangqian,LIU Jueding,HU Shaowei,et al.Felicity effect of cyclic tensile fracture test of concrete with central crack[J].Acta Materiae Compositae Sinica,2019,36(12):2968-2974.
• [17] SAGAR R,PRASAD B K,KUMAR S.An experimental study on cracking evolution in concrete and cement mortar by the b-value analysis of acoustic emission technique[J].Cement and Concrete Research,2012,42(8):1094-1104.