混凝土轴心受拉全曲线试验的新方法
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摘要
混凝土轴拉应力-应变全曲线反映了混凝土强度、变形等诸多特性,在总结和分析了不同拉伸应力-应变全曲线试验方法的基础上,基于细观损伤模型的损伤本构关系模型,提出了在混凝土轴心受压试验的同时通过测定混凝土横向拉伸变形,利用优化算法识别得到混凝土拉伸损伤参数和材料常数,进而得到混凝土单轴抗拉强度和应力-应变全曲线,并用已有试验结果加以验证。结果表明,理论预测结果与试验结果吻合良好。
The tensile stress-strain curve of concrete reflects many performances such as strength and deformation.The existed test methods obtaining softening response of concrete in tension were summarized and discussed. Based on the damage constitutive relation established by the author, a new test method of strength and deformation of concrete under axial tension was suggested. Through the specimen subjected axial compressive loading, transverse tensile strain was measured and random field parameters were identified by optimization algorithm. The full tensile stress-strain curve of concrete was also determined. Compared with test results, it is found that the analytical results have a good agreement with experiments.
The tensile stress-strain curve of concrete reflects many performances such as strength and deformation.The existed test methods obtaining softening response of concrete in tension were summarized and discussed. Based on the damage constitutive relation established by the author, a new test method of strength and deformation of concrete under axial tension was suggested. Through the specimen subjected axial compressive loading, transverse tensile strain was measured and random field parameters were identified by optimization algorithm. The full tensile stress-strain curve of concrete was also determined. Compared with test results, it is found that the analytical results have a good agreement with experiments.
引文
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[4]Qingbin L,Farhad A.High strength concrete in uniaxial tension[J].ACI Materials Journal,2000,97(1):49-57.
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[7]杨卫忠.混凝土弹塑性随机损伤本构关系理论与试验研究[D].上海:同济大学,2007.
[8]顾惠琳,彭勃.混凝土单轴直接拉伸应力-应变全曲线试验方法[J].建筑材料学报,2003(1):66-71.
[9]杨卫忠,王博.混凝土受拉随机损伤本构关系及其应用[J].工业建筑,2004,34(10):50-52.
[2]过镇海.混凝土的强度和变形-试验基础和本构关系[M]北京:清华大学出版社,1997.
[3]Zheng W.Shock vibration resistance and direct tensile strength of concrete[D].Hong Kong:University of Hong Kong2001.
[4]Qingbin L,Farhad A.High strength concrete in uniaxial tension[J].ACI Materials Journal,2000,97(1):49-57.
[5]Evans R H,Marathe M S.Microcracking and stress-strain curves for concrete in tension[J].Materials and Structures,1968(1):61-64.
[6]Schorn H,Berger-Bocker T.Test method for determining process zone position and fracture energy of concrete[J].Experimental Techniques,1989,29:29-33.
[7]杨卫忠.混凝土弹塑性随机损伤本构关系理论与试验研究[D].上海:同济大学,2007.
[8]顾惠琳,彭勃.混凝土单轴直接拉伸应力-应变全曲线试验方法[J].建筑材料学报,2003(1):66-71.
[9]杨卫忠,王博.混凝土受拉随机损伤本构关系及其应用[J].工业建筑,2004,34(10):50-52.