混凝土材料的广义非线性强度理论

Generalized nonlinear strength theory for concrete

在广义非线性强度理论的框架下,结合混凝土材料的力学特性,将混凝土材料的强度特性分解为相互独立的四个方面分别描述,进而建立了混凝土材料的广义非线性强度理论。该理论在主应力空间的偏平面上涵盖了从下限SMP曲线到上限Mises圆之间的所有区域,子午面上的破坏曲线为幂函数形式;共有四个材料参数,均具有明确的物理意义,并给出了参数的确定方法。通过与国内外学者已取得的四组混凝土材料的真三轴试验结果比较,表明了本文提出的混凝土材料的广义非线性强度理论可用于多种混凝土材料,合理计算其多轴强度。

In the framework of nonlinear strength theory the strength characteristics of concrete are described by 4 independent parameters respectively and the generalized strength nonlinear strength theory is established. The theory unifies a series of single nonlinear strength theories for various concrete materials describing the whole region between the upper-limit Mises circular curve and the lower-limit SMP （Spatial Mobilize Plane） curve on the deviatoric plane of principal stress space. The strength curves on the meridian plane are exponential functions. The method for determining these parameters is presented. The comparison of the calculation result with the data obtained from true triaxial test published by other authors indicates that the proposed theory is feasible to the calculation of multi-axial strengths of various concrete.