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为了研究混凝土在压力作用下的强度屈服情况,利用MTS对圆柱形混凝土试件进行三轴压缩试验,在四种不同围压情况下测得应力峰值和以及对应的塑性的体积变形情况。采用Mises-DruckerPrager准则描述孔隙压实区混凝土材料的屈服行为,同时引入材料在拉伸状态下的线性屈服面,得出了材料的屈服准则。利用不同形式的屈服准则形式(分段式、幂次型、指数型)对屈服准则拟合,并给出相应的拟合参数,并与线性的屈服线做以对比。
In order to study the yield strength of concrete under the action of pressure, the MTS was used to conduct the triaxial compression tests on the cylindrical concrete specimens. The stress peaks and the corresponding plastic deformation were measured under four different confining pressures. The Mises-Drucker Prager criterion is used to describe the yield behavior of concrete in pore-compacted zone, and the linear yield surface of the material is introduced to obtain the yield criterion of the material. The yield criterion was fitted by different forms of yield criterion (piecewise, power, exponential) and the corresponding fitting parameters were given and compared with the linear yield line.