水泥砂浆立方体试件劈拉强度尺寸效应研究
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摘要
采用物理模型试验方法和数值仿真分析方法,研究水泥砂浆立方体试件劈拉强度的尺寸效应,探索试件劈拉面上的水平拉应力分布规律以及试件的劈拉破坏机理.一方面,在实验室进行了不同尺寸水泥砂浆立方体试件劈拉强度物理模型试验;另一方面,基于MAZARS各向同性损伤理论,建立水泥砂浆劈拉数值试验模型,利用APDL命令流实现了试件劈拉破坏过程的数值仿真模拟.将数值仿真结果与相应的物理试验结果进行对比,结果表明:数值试验结果与模型试验结果表现出了很好的一致性;不同尺寸的水泥砂浆立方体试件,其劈拉强度具有明显的尺寸效应,且劈拉强度随着立方体试件尺寸的增大而减小;试件首先沿劈拉面出现损伤,进而发生开裂;试件在劈拉面上的水平应力呈现中部受拉、两端受压的分布规律.数值仿真与模型试验相结合的研究方法以及本文的研究成果对于混凝土结构工程应用以及材料学研究都具有借鉴意义.
The physical model test and numerical simulation analysis are all adopted to research the splitting tensile strength and the size effect of the cement mortar cube specimens,and to explore the horizontal tensile stress distribution on the splitting plane and the failure mechanism.The splitting tension strength tests of cement mortar cubes are conducted in the laboratory,whose sizes range from 70.7 mm to 200 mm;meanwhile,the corresponding numerical simulation models are established,and the splitting tensile failure process is simulated by APDL orders,which is based on the MAZARS isotropic damage theory.By comparison,the results from the numerical simulation analysis and the physical model tests,agree each other well.There exists obvious size effect on the splitting tensile strength of the cement mortar cubes;and with the size increasing of specimens,the splitting tensile strength decrease correspondingly;The specimen is cracked along the splitting plane firstly,then damaged thoroughly;on the splitting plane,the middle area is under horizontal tensile stress and both ends of the area are under the horizontal compressive stress.The research methods and the results could be as a reference in the research of concrete structure engineering and the material science.
The physical model test and numerical simulation analysis are all adopted to research the splitting tensile strength and the size effect of the cement mortar cube specimens,and to explore the horizontal tensile stress distribution on the splitting plane and the failure mechanism.The splitting tension strength tests of cement mortar cubes are conducted in the laboratory,whose sizes range from 70.7 mm to 200 mm;meanwhile,the corresponding numerical simulation models are established,and the splitting tensile failure process is simulated by APDL orders,which is based on the MAZARS isotropic damage theory.By comparison,the results from the numerical simulation analysis and the physical model tests,agree each other well.There exists obvious size effect on the splitting tensile strength of the cement mortar cubes;and with the size increasing of specimens,the splitting tensile strength decrease correspondingly;The specimen is cracked along the splitting plane firstly,then damaged thoroughly;on the splitting plane,the middle area is under horizontal tensile stress and both ends of the area are under the horizontal compressive stress.The research methods and the results could be as a reference in the research of concrete structure engineering and the material science.
引文
[1]陈晓洪.高应变率下水泥砂浆劈拉强度试验研究[J].科学技术与工程,2014,14(20):267-271.Chen Xiaohong. Cement mortar splitting tensile strength under high strain rate experiment research[J].Science Technology and Engineering,2014,14(20):267-271.
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[9]张绍麟.混凝土的劈裂抗拉强度与轴心抗拉强度的理论关系和试验对比[J].铁道科学与工程学报,1979,(2):65-82.Zhang Shaolin.The contrast of concrete splitting tensile strength and axial tensile strength theory relationship and physical test[J].Journal of Railway Science and Engineering,1979,(2):65-82.
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[11]中华人民共和国电力部.DL/T5150-2001水工混凝土试验规程[S].北京:中国电力出版社,2002.The Electric Power Ministry of the People’s Republic of China.DL/T5150-2001 Test Code for Hydraulic Concrete[S].Beijing:China Electric Power Press,2002.
[12]Xu Yi,Chen Shenghong.A method for modeling the damage behavior of concrete with a three-phase mesostructrue[J].Construction and Building Materials,2016,(102):26-38.
[13]Mazars J,Pijaudier Cabot G.Continuum damage theory-application to concrete[J].Journal of Engineering Mechanics,1989,115(2):345-365.
[14]余天庆,钱济成.损伤理论及其应用[M].北京:国防工业出版社,1993:141-146.Yu Tianqing,Qian Jicheng.Damage Theory and Its Application[M].Beijing:National Defense Industry Press,1993:141-146.
[15]苏捷.混凝土受压与受拉性能的尺寸效应研究[D].长沙:湖南大学,2012.Su Jie.The research on the size effect of concrete behavior in compression and tension[D].Changsha:Hunan University,2012.
[16]喻勇,陈平.岩石巴西圆盘试验中的空间拉应力分布[J].岩土力学,2005,26(12):1914-1916.Yu Yong,Chen Ping.Spatial distribution of tensile stress in Brazilian disk test of rock[J].Rock and Soil Mechanics,2005,26(12):1914-1916.
[2] Weibull W.Phenomenon of rupturein solids[J].Proc Royal Swedish Inst of Engineering Researeh,1939,(153):1-55.
[3] Bazant Z P.Size effect in blunt fracture:Concrete,rock,metal[J].Journal of Engineering Mechanics,1984,(110):518-535.
[4] Carpinteri A,Chiaia B.Fracture mechanics of concrete structures[C]//Proceeding,Ind International Conference on Fracture Mechanics of Concrete and Concrete Structures,Aedificatio Publishers,1995:515-534.
[5]杨成球,李光伟,周友耕.二滩水电站全级配混凝土力学性能试验研究[J].水电站设计,1988,4:37-46.Yang Chengqiu,Li Guangwei,Zhou Yougeng.The four-graded concrete mechanics performance test research of Ertan Hydropower Station[J].Design of Hydropower Station,1988,4:37-46.
[6]杨忠义.全级配混凝土强度的尺寸效应研究[J].水电站设计,2008,24(3):11-14.Yang Zhongyi.The four-graded concrete strength size effect research[J].Design of Hydropower Station,2008,24(3):11-14.
[7]黄海燕.混凝土尺寸效应理论研究与断裂参数分析[D].南京:河海大学,2004.Huang Haiyan.Study on size effects and mechanical parameters of concrete[D].Nanjing:Hohai University,2004.
[8] Carneiro F,Barcellos A.Concrete tensile strength,international union of testing and research laboratories for materials and structures(RILEM)[J].Paris,Bulletin,1953,13:97-123.
[9]张绍麟.混凝土的劈裂抗拉强度与轴心抗拉强度的理论关系和试验对比[J].铁道科学与工程学报,1979,(2):65-82.Zhang Shaolin.The contrast of concrete splitting tensile strength and axial tensile strength theory relationship and physical test[J].Journal of Railway Science and Engineering,1979,(2):65-82.
[10]Rocco C,Guinea G V,Planas J,et al.Size effect and boundary conditions in the brazilian test:Theoretical analysis[J].Materials and Structures,1999,32:437-444.
[11]中华人民共和国电力部.DL/T5150-2001水工混凝土试验规程[S].北京:中国电力出版社,2002.The Electric Power Ministry of the People’s Republic of China.DL/T5150-2001 Test Code for Hydraulic Concrete[S].Beijing:China Electric Power Press,2002.
[12]Xu Yi,Chen Shenghong.A method for modeling the damage behavior of concrete with a three-phase mesostructrue[J].Construction and Building Materials,2016,(102):26-38.
[13]Mazars J,Pijaudier Cabot G.Continuum damage theory-application to concrete[J].Journal of Engineering Mechanics,1989,115(2):345-365.
[14]余天庆,钱济成.损伤理论及其应用[M].北京:国防工业出版社,1993:141-146.Yu Tianqing,Qian Jicheng.Damage Theory and Its Application[M].Beijing:National Defense Industry Press,1993:141-146.
[15]苏捷.混凝土受压与受拉性能的尺寸效应研究[D].长沙:湖南大学,2012.Su Jie.The research on the size effect of concrete behavior in compression and tension[D].Changsha:Hunan University,2012.
[16]喻勇,陈平.岩石巴西圆盘试验中的空间拉应力分布[J].岩土力学,2005,26(12):1914-1916.Yu Yong,Chen Ping.Spatial distribution of tensile stress in Brazilian disk test of rock[J].Rock and Soil Mechanics,2005,26(12):1914-1916.