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在文献[1]的第一部分,或文献[3][4]中,我们介绍了实验所得轴心局压的破坏形态和强度规律,以及表面应变场的变化规律。本文据此提出了存在两种极限状态:开裂极限状态和破坏极限状态,及其相应的工作模型。在对于开裂后试件进入破坏极限状态时的工作模型的分析中,提出了存在“试件的整体作用”和“荷载的局部作用”的概念。本文根据国内外有关资料,以及我们对楔形体和表面应变场的实测资料,对抗拉,抗剪强度以及拉应力区的范围进行了探讨。并据以分别推导得出三维轴心局压条件下,开裂强度和破坏强度的理论公式
In the first part of the literature [1], or [3][4], we introduced the failure mode and strength rule of the axial compression obtained from the experiment, and the variation law of the surface strain field. This paper proposes that there are two limit states: cracking limit state and failure limit state, and their corresponding working models. In the analysis of the working model when the test piece enters the breaking limit state after cracking, the concept of “the overall effect of the test piece” and the “local effect of the load” is proposed. In this paper, the relevant data at home and abroad, as well as the measured data of the wedge body and surface strain field, the tensile strength, the shear strength and the range of the tensile stress region are discussed. According to the formula, the theoretical formulas for the cracking strength and failure strength under the condition of three-dimensional axial stress