Experimental study on seismic performance of brick wall strengthened with single-side polypropylene mesh-polymer mortar face
To improve the seismic performance of brick masonry rural building,a strengthening method using single-side polypropylene mesh-polymer mortar face was proposed,considering the actual application situation of rural building.Eight scaled specimens were designed and quasi-static tests were carried out.The variable parameters of the specimens included the form of the strengthening face,the thickness of the strengthening face and the strength of the masonry mortar.The failure patterns and horizontal load-displacement curves of the specimens were obtained.The bearing capacity,ductility,stiffness and energy dissipation capacity of the specimens were analyzed.It is shown that the failure patterns of brick walls strengthened with a single-side polypropylene mesh-mortar face under low cyclic reversed loads include shear-compression failure,shear-friction failure,and a combination of shear-compression and shear-friction failure,with the hysteretic curves being full fusiform.After strengthening with the single-side polypropylene mesh-mortar face,the peak load,displacement ductility coefficient,initial stiffness and maximum energy dissipation coefficient of the brick wall increase by 23％,84％,22％and 151％,respectively,indicating an effective improvement in the seismic performance of the brick wall.As the thickness of the strengthening face and the strength of the masonry mortar increase,the bearing capacity,initial stiffness and energy dissipation capacity of the strengthened brick wall show improvement.Based on the experimental study,a calculation method of the shear capacity for brick wall strengthened with a single-side polypropylene mesh-polymer mortar face was put forward,and average ratio between the calculation results and the experimental results is 0.99 and the variation coefficient is 0.059,indicating that the calculation results and the experimental results agree well.
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