The Research On Resistance To The Out-of-Plane And The Lateral Compressive Bearing Capacity Of Masonry Structure Walls

Because of the local availability of materials required for masonry structure construction, the durability, fire resistance, long service life characteristics o Masonry structures are widely used by both the urban and rural masses in China. However, as masonry structures usually have large dead weights and weak mortar bonding, the structure tends to have very low bending and tensile strength. For instance, in the2008Wenchuan earthquake, as the out-of-plane surface of many brick buildings can hardly stand tension and bending, this lead to the failure of the surfaces of masonry buildings and thus making the whole building collapsed. Therefore, the research on the properties of the out-of-plane stress of masonry structure is of urgent great importance, and has a vital practical significance.Engineering researchers have done intense research with regard lateral compression in masonry structure wall surface. Indeed serious research has been complete on inside-plane surface, but however, not much attention has been paid to the study of out-of-plane. The existence of the out-of-plane load on the one hand, leads to masonry wall out-of-plane tensile bending ability and hence causing the whole building to collapse after the external flash lose protection; on the other hand, the existence of the out-of-plane load can significantly affect the masonry wall lateral load bearing capacity, and speed up the wall crack development and failure.In this paper, by combining theoretical analysis and calculation and finite element software ABAQUS calculation mainly on5pieces of wall out-of-plane stress numerical simulation and analysis, by changing the aspect ratio, vertical compressive stress and high thick than to get wall piece of out-of-plane limit load. The load values obtained from calculation of out-of-plane loads of the simplified model just before the cracking of the wall clearly coincide with the values obtained using the finite element software. The analysis also outlines the influence of the height-width ratio, the vertical compressive stress and the thickness ratio’s on the out-of-plane limit load. From the finite element software calculations, the limit load value of wall pieces of different heights-width ratios and vertical compressive stress under the action of out-of-plane loads can be found. In situations below the limit load, through changing the size of the out-of-plane load on the wall under out-of-plane loading to study the effects of the presence of wall lateral limit loads with different height to width ratio and vertical compressive stress. In the end, steel mesh cement mortar reinforced on the wall which is the minimum bearing capacity at out-of-plane and the lateral. Through the finite element calculating on the reinforced wall with reinforced mortar layers, both of the out-of-plane and the lateral ultimate load capacity are improved obviously. What’s more, the out-of-plane limit load was increased to nearly three times as much.