Experimental Research On Seismic Behavior Of Masonry Walls Constrained By Core-tie-columns

China is a vast territory, and also has frequent earthquakes. In recent years, seismic damages after lots of strong earthquakes shows that, a large number of casualties and property losses are caused by severe damage and collapse of the engineering structure. The seismic damage survey of Wenchuan earthquake shows that, the collapse of rural buildings is the most serious. The reason is that the masonry structure is widely used in rural buildings, and cast-in-situ tie-columns and beams which are the main seismic fortification measures for the masonry structure in the present code, have not been widely used by plenty of self-built rural buildings, because of many unfavorable factors such as the complex construction process, long construction period, high requirements of construction technology and so on..Aiming at these problems, the core-tie-columns to solve the various problems, that exist in the application of the cast-in-situ tie-columns, are presented by the applicant's research team proposed. To verify the applicability and effectiveness of the technology, 11 masonry walls are tested under pseudo-static load, four main factors influencing the shear strength of masonry wall are considered, such as the level of the vertical stress, structural measures, aspect ratio and the layout of holes; And under the different forced state and structural measures, the seismic performance of core-tie-columns is analyzed through the failure process and the failure mode, the load and deformation, ductility, stiffness and energy dissipation capacity and so on.The results show that confined function of core-tie-columns and tie-beams is effective, and good connection using bars between tie-columns and walls is the key factor to play the confined function. Compared with unconfined masonry walls, bearing capacity, deformability, ductility and energy dissipation capacity of the wall are improved effectively by the measure of core-tie-columns and tie-beams. Compared with the wall confined by cast-in-situ tie-columns, the bearing capacity of the wall confined by core-tie-columns is slightly lower, but the deformation capacity, the ductility and energy dissipation capacity are equal or slightly better. The core–tie-column can meet requirement for seismic fortification of low earthquake intensity regions, and can be widely applied to rural buildings in low earthquake intensity regions.