Theoretical And Experimental Investigations On Mechanical Properties Of Concrete Perforated Brick Masonry And Axial Compression In-situ

Compressive strength, as an important mechanical parameter of masonry structure,plays an important role to the reliability assessment, building detection andreinforcement, and accident analysis of masonry structure. Axial compression in-situ, asa main method for masonry compression strength detecting, has been incorporated intothe current technical standard GB/T50315. The current technical standard only suit forfired brick masonry, and there has no available detecting method and technical standardfor non-fired brick masonry. The purpose of this research project is to propose theassessment method of compression strength in site of non-fired brick masonry.Firstly, this paper do a research of the theoretical and experimental investigationson mechanical properties of concrete perforated brick masonry and masonry materials.Mainly analysis the mechanical properties and failure mechanism characteristics ofconcrete perforated brick masonry; Proposed the Elastic modulus and Poisson’s ratio ofmasonry and masonry materials; Established the constitutive relation formula ofmasonry and masonry materials. The experiment results show that there has no obviousdifferences of the mechanical properties between concrete perforated brick masonry andfired brick masonry.Secondly, according to concrete porous brick masonry in-situ axial compressionmethod for further study, through the in-situ compressive strength and compressivestrength of the contrast test of standard test pieces and get conversion relationship between compressive strength based on the test, and nonlinear finite element methodwas applied to sintering and sintered brick masonry theory comparison study in-situaxial compression method. The results show that different kinds of brick, masonrystrength and mechanical performance parameters, there is no obvious difference of thestrength of the masonry conversion coefficient. But due to the large perforated brickheight, plumpness of the vertical mortar, masonry between two channels spread stress tothe two side wall limb by shear stress, and the constraints are provided on both sides ofthe wall limb is weak. So perforated brick masonry strength conversion coefficientslightly smaller than the ordinary brick masonry.Analysis result and strength conversion coefficient formula has been used by thestandard (Opinion Soliciting Draft).