Axial Compression Ratio Analysis Of Masonry Walls And Design And Analysis Of Shear Failure Test Of Walls

This paper study the seismic performance of masonry walls, and this research is belonged to the study of NSFC (50978177).First of all, the earthquake damage characteristics analysis situation and seismic studies status of masonry structure were reviewed in this paper.Secondly, within the scope of total layers and each story height of non-reinforced masonry structure in the code, the research calculates axial force of each whole section and subsection of typical wall, and calculates the compressive stress and axial compression ratio. By analyzing, some conclusions can be concluded:compressive stress of wall exist in 0.08～0.95 MPa, and axial compression ratio exist in 0.047～0.492 MPa. And with the increase of layers, the axial compressive stress and axial compression ratio gradually increase. The axial compression stress of exterior wall is more smaller than interal wall. The axial compressive stress and axial compression ratio relate to top layers of wall, load size, masonry materials, and the structural layout and so on.Then, Because the test study shear bearing capacity of wall which allocate central column and levelly reinforce, the research design three straight specimens under different axial compression ratio. The research give the specimen size and reinforcement figure, total materials table, and determine the loading equipment's arrangement, loading system, strain gauge arrangement, material selection and strength test design, and construction design.Finally, the research deduces the seismic resistance bearing capacity formula with the average of the specimens material strength. Meanwhile, according to the relation of value between the height of relative compression zone and the boundary height of relative compression zone, the research deduces the bending moment bearing capacity formulas under large deflecting loading condition and small deflecting loading condition of specimens. The shear bearing capacity and bending bearing capacity of designed specimen are calculated, and the destroying forms of specimens of different axial compression ratio are analyzed in the research. And the conclusion can be deduced that the destroying form of specimens are shear destroying. Analyzing the specimens with finite element software, the reactionforce - displacement curves of loading point is obtained.