Experimental Study On The Bond Performance Of Reinforcement In Reinforced Masonry Subjected To Vertical Pressure

Masonry structure is a structure with a long history,all previous earthquake damage shows that unreinforced masonry structure seismic damage is serious.In order to improve the seismic performance,formed in the masonry configured in a certain amount of steel bar reinforced masonry in the earthquake zone in China with the inevitable choice of masonry structure.The seismic behavior of reinforced masonry enhances the key is the bond between steel and masonry.Masonry structure reinforcement in bond strength is not only related to the intensity of the mortar,also associated with masonry of vertical compressive stress.Therefore,based on the reinforcement of brick masonry as the research object,through experiment and theoretical analysis,aims to explore the reinforced masonry under vertical pressure should be reinforced bonding performance.The main research content and conclusions are as follow.In this paper,based on the actual mechanical characteristics of horizontal reinforcing steel bar in the reinforced masonry,self-made testing apparatus,to simulate the structures in the process of construction and use,being dead weight and the compression function of the upper loads.Made 20 groups of specimens,considering the factors such as the vertical compressive stress and the bond anchorage length,by drawing test,the specimen sample destruction form and the bond-slip curve pattern,based on the bond-slip curve characteristics and the analysis of the influence parameters,put forward considering the effects of vertical compressive stress of reinforced brick masonry bond-slip constitutive model,established the bond-slip mathematical expression,including the vertical compressive stress is given with the bond anchorage length of two variables bond-slip characteristics parameter equation,and compares the results of analysis,conclusion shows that the predicted results are in good agreement with those obtained with the test results.Through the reinforcement strain gauge is stuck outside,the reinforcement of brick masonry under the long bond anchorage reinforcement along the length direction of the strain distribution rule,by solving matrix equation of bond stress strain method,the reinforcement along the length direction of the stress distribution is also given to response the analytic function of bond stress distribution.