普通混凝土和轻骨料混凝土双轴加载试验研究
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摘要
为研究混凝土双轴力学特性,采用岩石真三轴仪对普通混凝土(OPC)与轻骨料混凝土(LWAC)进行双轴压-压与双轴拉-压试验,得到2种混凝土在不同侧向应力作用下的破坏形态、应力-应变曲线以及应力-应变曲线特征值,对比分析其主应力变化趋势及破坏机理.结果表明:OPC双轴受力破坏主要是界面过渡区破坏,LWAC则是页岩陶粒骨料破坏;双轴压-压工况条件下,受侧向压应力影响的LWAC主压应力提高幅度低于OPC;双轴拉-压工况条件下,受侧向拉应力影响的OPC主拉应力降低幅度高于LWAC.最后,基于Kupfer双轴压-压与双轴拉-压破坏准则建立了定侧向加载下OPC与LWAC的双轴压-压、双轴拉-压破坏准则方程.
In order to study the mechanical properties under concrete biaxial force, the true triaxial machine was used to study the biaxial compression and biaxial tension and compressive test of ordinary concrete(OPC) and lightweight aggregate concrete(LWAC). The damage form and stress-strain curve of concrete under different lateral stresses were obtained. The experimental results of LWAC were compared, and the influence of the main stress and the main tensile stress on the concrete under different lateral pressures and its failure mechanism was analyzed. The results show that the damage of OPC biaxial stress is mainly the damage of cement cementations' layer, which is different from the damage of the shale ceramist aggregate of LWAC. Under the biaxial compressive condition, the main compressive stress of LWAC is affected by the lateral stress and the degree is lower than that of OPC. The degree of lateral stress reduction is slightly higher than that of LWAC. Finally, based on the Kupfer's failure criterion, the biaxial compression pressure and biaxial tension and compressive failure criterion equation for OPC and LWAC under the fixed side loading is proposed.
In order to study the mechanical properties under concrete biaxial force, the true triaxial machine was used to study the biaxial compression and biaxial tension and compressive test of ordinary concrete(OPC) and lightweight aggregate concrete(LWAC). The damage form and stress-strain curve of concrete under different lateral stresses were obtained. The experimental results of LWAC were compared, and the influence of the main stress and the main tensile stress on the concrete under different lateral pressures and its failure mechanism was analyzed. The results show that the damage of OPC biaxial stress is mainly the damage of cement cementations' layer, which is different from the damage of the shale ceramist aggregate of LWAC. Under the biaxial compressive condition, the main compressive stress of LWAC is affected by the lateral stress and the degree is lower than that of OPC. The degree of lateral stress reduction is slightly higher than that of LWAC. Finally, based on the Kupfer's failure criterion, the biaxial compression pressure and biaxial tension and compressive failure criterion equation for OPC and LWAC under the fixed side loading is proposed.
引文
[1] 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,1997:166-167.GUO Zhenhai.Strength and deformation of concrete:Basis of test and constitutive relationship[M].Beijing:Tsinghua University Press,1997:166-167.(in Chinese)
[2] 王四巍,王忠福,潘旭威,等.多轴应力下塑性混凝土峰值后变形特征[J].建筑材料学报,2014,17(4):654-658.WANG Siwei,WANG Zhongfu,PAN Xuwei,et al.Post peak deformation characteristics of plastic concrete under multiaxail stress state[J].Journal of Building Materials,2014,17(4):654-658.(in Chinese)
[3] COSTA H,JúLIO E,LOUREN?O J.New approach for shrinkage prediction of high-strength lightweight aggregate concrete[J].Construction and Building Materials,2012,35:84-91.
[4] XUAN H V,DAUDEVILLE L,MALECOT Y.Effect of coarse aggregate size and cement paste volume on concrete behavior under high triaxial compression loading[J].Construction and Building Materials,2011,25(10):3941-3949.
[5] GABET T,MALéCOT Y,DAUDEVILLE L.Triaxial behaviour of concrete under high stresses:Influence of the loading path on compaction and limit states[J].Cement and Concrete Research,2008,38(3):403-412.
[6] FUJIKAKE K,MORI K,UEBAYASHI K,et al.Dynamic properties of concrete materials with high rates of tri-axial compressive loads[J].Structures under Shock and Impact Ⅵ,2000,8:511-522.
[7] 宋玉普.多种混凝土材料的本构关系和破坏准则[M].北京:中国水利水电出版社,2002:179-238.SONG Yupu.Constitutive relations and failure criteria of various concrete materials[M].Beijing:China Water and Power Press,2002:179-238.(in Chinese)
[8] SHANG S,SONG Y.Dynamic biaxial tensile-compressive strength and failure criterion of plain concrete[J].Construction and Building Materials,2013,40:322-329.
[9] TSCHEGG E K,SCHNEEMAYER A,MERTA I,et al.Energy dissipation capacity of fibre reinforced concrete under biaxial tension-compression load.Part I:Test equipment and work of fracture[J].Cement and Concrete Composites,2015,62:195-203.
[10] KUPFER H B.Behavior of concrete under biaxial stresses[J].Journal of the Engineering Mechanics Division ASCE,1973,66(8):853-866.
[2] 王四巍,王忠福,潘旭威,等.多轴应力下塑性混凝土峰值后变形特征[J].建筑材料学报,2014,17(4):654-658.WANG Siwei,WANG Zhongfu,PAN Xuwei,et al.Post peak deformation characteristics of plastic concrete under multiaxail stress state[J].Journal of Building Materials,2014,17(4):654-658.(in Chinese)
[3] COSTA H,JúLIO E,LOUREN?O J.New approach for shrinkage prediction of high-strength lightweight aggregate concrete[J].Construction and Building Materials,2012,35:84-91.
[4] XUAN H V,DAUDEVILLE L,MALECOT Y.Effect of coarse aggregate size and cement paste volume on concrete behavior under high triaxial compression loading[J].Construction and Building Materials,2011,25(10):3941-3949.
[5] GABET T,MALéCOT Y,DAUDEVILLE L.Triaxial behaviour of concrete under high stresses:Influence of the loading path on compaction and limit states[J].Cement and Concrete Research,2008,38(3):403-412.
[6] FUJIKAKE K,MORI K,UEBAYASHI K,et al.Dynamic properties of concrete materials with high rates of tri-axial compressive loads[J].Structures under Shock and Impact Ⅵ,2000,8:511-522.
[7] 宋玉普.多种混凝土材料的本构关系和破坏准则[M].北京:中国水利水电出版社,2002:179-238.SONG Yupu.Constitutive relations and failure criteria of various concrete materials[M].Beijing:China Water and Power Press,2002:179-238.(in Chinese)
[8] SHANG S,SONG Y.Dynamic biaxial tensile-compressive strength and failure criterion of plain concrete[J].Construction and Building Materials,2013,40:322-329.
[9] TSCHEGG E K,SCHNEEMAYER A,MERTA I,et al.Energy dissipation capacity of fibre reinforced concrete under biaxial tension-compression load.Part I:Test equipment and work of fracture[J].Cement and Concrete Composites,2015,62:195-203.
[10] KUPFER H B.Behavior of concrete under biaxial stresses[J].Journal of the Engineering Mechanics Division ASCE,1973,66(8):853-866.