三向等压荷载历史对混凝土的强度和变形特性影响的研究

通过试验，研究了混凝土载后抗压强度，抗拉强度与所经历的三向等压荷载历史的关系，给出了无量纲形式的经验表达式。同时还通过试验研究了三向等压荷载历史对混凝土声速的影响，以及强度与声速之间的关系。在对试验资料进行分析的基础上，进一步给出了三向等压条件下，御载曲线中平均应力σm与平均应变ξm之间的微分表达式，研究了其中参数的变化规律，进一步从混凝土结构的细观角度进行推导，同样得到了这一表达式。

Effect of Triaxial Equi-compressional Loading History on the Strength and Deformation

Triaxial equi|compression test of two sets of concrete with different strength has been carried out. Based on the experimental results the empirical relationship between the compressive/tensile strength of concrete after loading history and the experienced maximum stress has been developed. In addition, the effect of triaxial equi|compressive loading history on the ultrasonic velocity and the relation between the strength and the ultrasonic velocity are also studied. On the basis of experimental data the differential relationship between the averaged stress and the averaged strain of the unloading curve for concrete under the condition of triaxial equi|compression is established.The variation of the parameters in the formula with the changing of loading history is studied. The same formula can also be derived through analyzing the process of crack formation of the material in a microscopic scale.;