考虑应变软化的再生混凝土应力-应变全曲线方程
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摘要
由于影响因素较多,确定再生混凝土的应力-应变全曲线性能需要积累较多的研究结果。采用0、50%和100%3种取代率,70 mm×70 mm×148 mm棱柱体试件,电-液伺服试验机,等位移速率加载,进行了再生混凝土单轴受压试验,获得了再生混凝土全曲线。试验表明:随取代率的增加,再生混凝土弹性模量略有减少,峰值应变逐渐增加,曲线上升段的略有差异。50%取代率组强度极限时试件的裂缝发展稳定性较差,100%取代率组峰值应力低变形能力较好。根据试验结果分析了应变软化现象,建立了再生混凝土考虑软化现象的全曲线方程。
The recycled concrete has more factors that affect the factors of complete stress-strain curve,the more result of the test curves are needed to accumulate to confirm the property of recycled concrete.In this paper,three replacement rate of recycled aggregate were 0,50%and 100%,the dimension of the specimens were 70 mm×70 mm×148 mm,electric-hydraulic servo testing machine and displacement rate control loading were used in uniaxial compression test.Tests predicted that with the replacement rate increased,the recycled concrete elastic modulus decreased slightly,and the peak strain increased.The ascending part of the curve had a slightly different among these three groups.At the ultimate strength the cracks of 50% replacement rate had more unstable comparing the virgin aggregate samples,the 100% recycled concrete samples had lower ultimate stress and higher deformation.According to result of test,the strain softening phenomenon of recycled was discussed,the equation of recycled concrete complete stress-strain curve was established considering strain softening.
The recycled concrete has more factors that affect the factors of complete stress-strain curve,the more result of the test curves are needed to accumulate to confirm the property of recycled concrete.In this paper,three replacement rate of recycled aggregate were 0,50%and 100%,the dimension of the specimens were 70 mm×70 mm×148 mm,electric-hydraulic servo testing machine and displacement rate control loading were used in uniaxial compression test.Tests predicted that with the replacement rate increased,the recycled concrete elastic modulus decreased slightly,and the peak strain increased.The ascending part of the curve had a slightly different among these three groups.At the ultimate strength the cracks of 50% replacement rate had more unstable comparing the virgin aggregate samples,the 100% recycled concrete samples had lower ultimate stress and higher deformation.According to result of test,the strain softening phenomenon of recycled was discussed,the equation of recycled concrete complete stress-strain curve was established considering strain softening.
引文
[1]肖建庄.再生混凝土单轴受压应力-应变全曲线试验研究[J].同济大学学报:自然科学版,2007,35(11):1445-1449.
[2]XIAO J,LI J,ZHANG C.Mechanical properties of recycled aggregate con-crete under uniaxial loading[J].Cement and Concrete Research,2005,35(6):1187-1194.
[3]邓志恒,杨海峰,林俊,等.再生混凝土应力-应变全曲线试验研究[J].混凝土,2008(11):22-24.
[4]王雪婷,杨德健.再生混凝土单轴受压应力-应变全曲线试验[J].天津城市建设学院学报,2010(3):175-178.
[5]DU T,WANG W,LIU Z,et al.The complete stress-strain curve of re-cycled aggregate concrete under uniaxial compression loading[J].Jour-nal of Wuhan University of Technology-Mater.Sci.Ed.,2010(5).
[6]JGJ55—2000,普通混凝土配合比设计规程[S].北京,2000.
[7]GB/T50081—2002,普通混凝土力学性能试验方法[S].北京,2002.
[8]王传志,腾志明.钢筋混凝土结构理论[M].北京:中国建筑工业出版社,1985:77-89.
[9]过镇海,张秀琴,张达成,等.混凝土应力-应变全曲线的试验研究[J].建筑结构学报,1982(1):1-12.
[10]钱觉时,王智,罗晖.混凝土应变软化关系及其确定[J].大连理工大学学报,1997(S1).
[11]PALMQUIST S M.Compressive behavior of concrete with recycled ag-gregates[D].United States-Massachusetts:Tufts University,2003.
[12]陈惠发,萨里普A.F.混凝土和土的本构方程[M].北京:中国建筑工业出版社,2004.
[13]JANSEN D C,SHAH S P.Effect of length on compressive strain soften-ing of concrete[J].Journal of Engineering Mechanics,1998,123(1):25-35.
[14]刘丰.再生混凝土的基本受力行为与变形性能研究[D].西安:西安建筑科技大学,2011.
[15]刘丰,白国良,柴园园,等.再生混凝土受压循环试验研究[J].世界地震工程,2010(3):43-47.
[2]XIAO J,LI J,ZHANG C.Mechanical properties of recycled aggregate con-crete under uniaxial loading[J].Cement and Concrete Research,2005,35(6):1187-1194.
[3]邓志恒,杨海峰,林俊,等.再生混凝土应力-应变全曲线试验研究[J].混凝土,2008(11):22-24.
[4]王雪婷,杨德健.再生混凝土单轴受压应力-应变全曲线试验[J].天津城市建设学院学报,2010(3):175-178.
[5]DU T,WANG W,LIU Z,et al.The complete stress-strain curve of re-cycled aggregate concrete under uniaxial compression loading[J].Jour-nal of Wuhan University of Technology-Mater.Sci.Ed.,2010(5).
[6]JGJ55—2000,普通混凝土配合比设计规程[S].北京,2000.
[7]GB/T50081—2002,普通混凝土力学性能试验方法[S].北京,2002.
[8]王传志,腾志明.钢筋混凝土结构理论[M].北京:中国建筑工业出版社,1985:77-89.
[9]过镇海,张秀琴,张达成,等.混凝土应力-应变全曲线的试验研究[J].建筑结构学报,1982(1):1-12.
[10]钱觉时,王智,罗晖.混凝土应变软化关系及其确定[J].大连理工大学学报,1997(S1).
[11]PALMQUIST S M.Compressive behavior of concrete with recycled ag-gregates[D].United States-Massachusetts:Tufts University,2003.
[12]陈惠发,萨里普A.F.混凝土和土的本构方程[M].北京:中国建筑工业出版社,2004.
[13]JANSEN D C,SHAH S P.Effect of length on compressive strain soften-ing of concrete[J].Journal of Engineering Mechanics,1998,123(1):25-35.
[14]刘丰.再生混凝土的基本受力行为与变形性能研究[D].西安:西安建筑科技大学,2011.
[15]刘丰,白国良,柴园园,等.再生混凝土受压循环试验研究[J].世界地震工程,2010(3):43-47.
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