Full-scale Model Failure Form Experiment And Analysis Of Masonry Walls

Masonry structure as one of main structure has poor seismic performance and destroys collapsed in our country. Anti-seismic research for masonry structure and to develop new types of walls is the key to improve the performance of multistory masonry structure. This paper tests seismic performance of the brick masonry structure wall to provide a theoretical and experimental basis for the design of new ductile masonry wall. The topic is the National Natural Science Foundation (50978177) and technical difficulties in Shanxi province (20110313026-3).This paper summarized the damaged characteristics of masonry structures in the earthquake, contrasted flexural failure and shear failure to highlight the seismic advantages of masonry structure’s flexural failure, sumed up the experimental study about the seismic performance of masonry structure at home and abroad.Two brick walls with different height to width ratio have been designed and producted. The experiment included the specimen size, strength of materials, specimens of reinforcement, construction drawing and measuring point layout design etc. Specimens included beam production, steel bar binding, strain gauge paste, brick masonry wall bricklaying, pouring of concrete and curing, wall paint etc. The paper tested and rated the strength of materials used in the experiment under the same conditions to make full preparation for the experiment.The horizontal loading system, vertical loading system, data acquisition system and other instruments were introduced in detail. The displacement sensors were pasted according to the arrangement figure of measuring point. The instruments were calibrated, installation and debugging were made. This experiment adopted load-displacement loading system. It used load controlling before wall succumbing and primary circulation, and then used displacement loading controlled3times per cycle. Observe and record the development of crack formation and the width of crack in each of the first cycle.The damage of specimens was described. To compare the failure pattern, hysteresis curve, skeleton curve, deformation capacity, energy dissipation capacity, strength and other properties showed that TB-2devised larger height to width ratio occurs bending failure with better deformation ability, ductility, energy dissipation capacity and seismic performance. Advocate setting structural fractures on masonry window wall to transforme brittle shear failure into ductile bending failure. The theoretical basis for optimal design of masonry structure was provided. The paper calculated the shear strength and flexural capacity of specimens in theory, compared the actual specimen shear span ratio with boundary shear span ratio to judge the failure pattern of specimens. The results showed that specimen failure pattern is consistent with the experiment.