冲击荷载作用下混凝土破坏强度的确定及CT验证
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摘要
从细观结构出发,把混凝土看作由骨料、界面和砂浆组成的非均质复合材料,建立随机骨料模型,应用损伤塑性本构,对试件进行了冲击荷载作用下的数值模拟,通过施加不同的加载方式,研究材料的损伤破坏过程,最终以位移加载得出荷载-位移曲线的峰值强度作为细观混凝土试样的破坏强度。通过对混凝土进行冲击荷载作用下的实时CT扫描,得出试件的荷载位移曲线及各个应力阶段的CT图像,发现数值模拟所得混凝土强度及破坏过程与CT观测到的结果有较好的相似性。结果表明,利用该方法研究混凝土在冲击荷载作用下的损伤破坏过程是合适的,以荷载-位移曲线的峰值点作为混凝土破坏强度点是合理的。
Concrete was taken as three-phase composites consisting of aggregate,bond and mortar on micro-level.We established the random aggregating model and applied the concrete damage plasticity model.By applying different loading we carried out the numerical simulation of the specimen under impact load.Eventually,the peak intensity obtained from the load-displacement was regarded as the destruction strength of the micro-concrete specimens.We researched the material damage process and gained the CT image of each stress stage by the scanning of the specimen under impact loading.We found the failure process and the destruction strength of the numerical simulation is similar to the CT test.The results show that the method is convenient to simulate the damage and fracture of concrete under impact loading.Taking the peak intensity of the load-displacement curve as the destruction strength is reasonable.
Concrete was taken as three-phase composites consisting of aggregate,bond and mortar on micro-level.We established the random aggregating model and applied the concrete damage plasticity model.By applying different loading we carried out the numerical simulation of the specimen under impact load.Eventually,the peak intensity obtained from the load-displacement was regarded as the destruction strength of the micro-concrete specimens.We researched the material damage process and gained the CT image of each stress stage by the scanning of the specimen under impact loading.We found the failure process and the destruction strength of the numerical simulation is similar to the CT test.The results show that the method is convenient to simulate the damage and fracture of concrete under impact loading.Taking the peak intensity of the load-displacement curve as the destruction strength is reasonable.
引文
[1]马怀发,陈厚群.全级配大坝混凝土动态损伤破坏机理研究及其细观力学分析方法[M].北京:中国水利水电出版社,2008:1-3.MA Huaifa,CHEN Houqun,Full-graded dam concrete dynamic Damage Mechanism and micro-mechanical analysis[M].Peking:China WaterPower Press,2008:1-3.(in Chinese)
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[13]田威,党发宁,陈厚群.动力荷载作用下混凝土破裂特征的CT试验研究[J].地震工程与工程振动,2011,31(1):30-34.TIAN Wei,DANG Faning,CHEN Houqun.CT experimental study on failure characteristics of concrete under dynamic loading[J].Journal ofEarthquake Engineering and Engineering Vibration,2011,31(1):30-34.(in Chinese)
[14]刘汉昆,孙超,李杰.基于CT扫描的混凝土三维细观数值模拟[J].建筑科学与工程学报,2010(1):54-59.LIU Hankun,SUN Chao,LI Jie.Three-demensional mesoscopic numerical simulation of concrete based on CT scan[J].Journal of Architectureand Civil Engineering,2010(1):54-59.(in Chinese)
[2]马怀发,陈厚群,黎保琨.混凝土试件细观结构的数值模拟[J].水利学报,2004,(10):27-35.MA Huaifa,CHEN Houqun,LI Baokun.Meso-structure numerical simulation of concrete specimens[J].Journal of Hydraulic Engineering,2004(10):27-35.(in Chinese)
[3]彭一江,黎保琨,刘斌.碾压混凝土细观结构力学性能的数值模拟[J].水利学报,2001(6):19-22.PENG Yijiang,LI Baokun,LIU Bin,Numerical simulation of meso-level mechanical properties of roller compacted concrete[J].Journal of Hy-draulic Engineering,2001(6):19-22.(in Chinese)
[4]于庆磊,唐春安,朱万成,等.基于数字图像的混凝土破坏过程的数值模拟[J].工程力学,2008(9):72-78.YU Qinglei,TANG Chunan,ZHU Wancheng,et.al.Digital image-based numerical simulation on failure process of concrete[J].Engineering Me-chanics,2008(9):72-78.(in Chinese)
[5]中华人民共和国电力部.DL5073-1997水工建筑物抗震设计规范[S].北京:中国电力出版社,1997.Power of the People's Republic of China.DL 5073-1997 Anti-Seismic Design Code of Marine Structures[S].Beijing:China Power Press,1997,(inChinese)
[6]Harris W D,Mohorovic E C Dolen T P.Dynamic properties of mass concrete obtained from dam cores[J].ACI Material Journal,2000(97):290-296.
[7]计家荣.高强度大体积混凝土材料特性研究[J].水利发电,1998,(3):17-20,46.JI Jiarong.Study on the material properties of high strength mass concrete[J].Water Power,1998,(3):17-20,46.(in Chinese)
[8]肖诗云,田子坤.混凝土单轴动态受拉损伤试验研究[J].土木工程学报,2008(7):14-20.XIAO Shiyun,TIAN Zikun.Experimental study on the uniaxial dynamic tensile damage of concrete[J].China Civil Engineering Journal,2008(7):14-20.(in Chinese)
[9]党发宁,尹小涛,丁卫华,等.基于CT试验的岩体分区破损本构模型[J].岩石力学与工程学报,2005(22):4004-4009.DANG Faning,YIN Xaotao,DING Weihua,et al.Subarea breakage constitutive model of rock mass based on CT test[J].Chinese Journal of RockMechanics and Engineering,2005(22):4 004-4 009.(in Chinese)
[10]杨更社,刘慧.基于CT图像处理技术的岩石损伤特性研究[J].煤炭学报,2007(32):464-468.YANG Gengshe,LIU Hui.Study on the rock damage characteristics based on the technique of CT image processing[J].Journal of China Coal So-ciety,2007,(32):463-468.(in Chinese)
[11]任建喜,葛修润,蒲毅彬,等.岩石卸荷损伤演化机制CT实时分析初探[J].岩石力学与工程学报,2000,19(6):697-701.REN Jianxi,GE Xiurun,PU Yibin,et al.Primary study of real-time CT testing of unloading damage evolution law of rock[J].Chinese Journal ofRock Mechanics and Engineering,2000,19(6):697-701.(in Chinese)
[12]陈厚群,丁卫华,蒲毅彬,等.单轴压缩条件下混凝土细观破裂过程的X射线CT实时观测[J].水利学报,2006(9):1044-1050.CHEN Houqun,DING Weihua,PU Yibin,et al.Real time observation on meso fracture process of concrete using X-ray CT under uniaxial com-pressive condition[J].Journal of Hydraulic Engineering,2006(9):1 044-1 050.(in Chinese)
[13]田威,党发宁,陈厚群.动力荷载作用下混凝土破裂特征的CT试验研究[J].地震工程与工程振动,2011,31(1):30-34.TIAN Wei,DANG Faning,CHEN Houqun.CT experimental study on failure characteristics of concrete under dynamic loading[J].Journal ofEarthquake Engineering and Engineering Vibration,2011,31(1):30-34.(in Chinese)
[14]刘汉昆,孙超,李杰.基于CT扫描的混凝土三维细观数值模拟[J].建筑科学与工程学报,2010(1):54-59.LIU Hankun,SUN Chao,LI Jie.Three-demensional mesoscopic numerical simulation of concrete based on CT scan[J].Journal of Architectureand Civil Engineering,2010(1):54-59.(in Chinese)
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