Abstract
Experimental results of determining the bearing capacity of a marble beam are presented. A significant influence of plastic properties on the strength characteristics of the beam is noted. On the basis of a model of strength-different materials, an elastoplastic profile of stresses in a beam is constructed. It is proposed to use elastic stress distribution in the compression zone for rocks and similar heterogeneous materials with different compressive and tensile strengths, and elastic-plastic distribution in the tensile zone. Such a stress diagram makes it possible to explain the high values of bending strength in comparison with the tensile strength of the presented materials.
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