Experimental study on flexural properties of perforated concrete brick masonry materials

Based on shear tests,the shear behavior of perforated concrete brick masonry materials was systematically studied,a calculation equation for the shear strength of the material was deduced,a constitutive model for the mortar joint in perforated concrete brick masonry under shear was proposed,which provided the basic references for the development of "Technical Specifications for Concrete Perforated Brick Masonry Buildings"(CECS257:2009).The results indicate that the shear strength of perforated concrete brick masonry is higher than that of fired perforated brick masonry with the same brick and mortar strength.For the different type of bricks the shear strength of masonry materials are a little bit different,the shear strength of the masonry with initial compressive stress in construction is lower than that of the masonry without initial compressive stress,the shear strength of the masonry with loading history is higher than that of the masonry without loading history,and the shear strength of masonry under compression can be determined with the Mohr-Coulomb criterion in a certain range.The results also indicate that the initial slop of the shear stress-shear strain curve is big;when the stress approaches the ultimate stress,the strain increases rapidly,but the stress is almost a constant.