| 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. |
| 关键词: 混凝土 双轴受力 力学性能 破坏准则 |
| DOI：103969/j.issn.1007 9629201903007 |
| 分类号: |
| 基金项目:中央高校基本科研业务费专项资金资助与江苏省研究生科研与实践创新计划项目(KYCX_170132)；国家重点研发计划项目（2016YFC0401704） |
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| Experimental Study on Mechanical Properties of Ordinary Concrete and Lightweight Aggregate Concrete Based on Biaxial Loading |
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YU Zhenpeng1, HUANG Qiao1, XIE Xinghua2
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1.School of Transportation, Southeast University, Nanjing 211102, China;2.Hydraulic Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China
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| Abstract: |
| 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 Kupfers 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. |
| Key words: concrete biaxial force mechanical property failure criterion |
