Experimental Study On Seismi Performance Of Prestressed Autoclaved Flyash-lime Solid Brick Walls

Along with the basic national policies that protect the land resource and farmland are executed, the autoclaved flyash-lime solid brick have replaced the clay block, and become one of the predominant wall material in the reformation of wall material. In recently years, the autoclaved flyash-lime solid brick is wildly used in urban buildings. For the shear strength of the autoclaved flyash-lime solid brick is low, it is a question for in-depth discussion that how to improve masonry's crack-resistance and seismic behavior by effective technical measure.Prestress the masonry wall can change its material property, improve masonry's crack-resistance, shear strength-resistance and seismic behavior, and also expand masonry's application scope, fulfill the requires of masonry development for tall-building, anti-seismic and environmental protection. Based on domestic and international researches, this paper have experimental researched on crack-resistance and seismic behaviors of prestressed autoclaved flyash-lime solid brick masonry, and below is the concrete contents of research:The characteristics and development of the masonry structure are simply introduced.Together with the development and study e of prestressed masonries both at home and abroad, the content and purpose of the paper are described.In addition, 2 pieces of prestressed autoclaved flyash-lime solid brick masonry models and 1 piece of normal autoclaved flyash-lime solid brick masonry model are tested under frequency low-cyclic static load. We record and describe the progress of the test, the component failure modes, and other relevant things.With the help of wall destructive patterns, resistance strain gauge, dial indicator, displacement meter and the top's load-displacement curve ,we analyze the various performance of the walls during horizontal earthquake. The results of the tests show clearly some conclusions.First, the failure process of prestressed autoclaved flyash-lime solid brick masonry models and normal autoclaved flyash-lime solid brick masonry model are basically similar under frequency low-cyclic static load . Second , the crack resistance of the masonry is greatly improved and the cracking load of the masonry is greatly enhance after being prestressed. Third, the carrying capacity of shear-resistance and deformation of the masonry walls are increased and stiffness degradation ot them are delayed because that prestress strengthens the connection between structure column and ring beam and integrity of masonry models. Futhurmore, the Seismic Performance such as deformation behavior, ductility, energy dissipation of the walls are improved. the walls will not fall apart with cracks, which indicate that such walls may retain the entirety well and have good resistance of collapse.The failure mechanism and the pattern of damage are analyzed in this paper. On the grounds of experimental results and theoretical analysis, the formula of ultimate shear capacity of prestressed masonry wall is established.According to the research results, some recommendations of design method and construction details of prestressed masonry are simply introduced in this paper.