Experimental Research On Aseismatic Behavior Of Masonry Walls Strengthened With BFRP

Although the use of brick masonry is limited in the engineering constructionpresently,masonry structure is still a main structure form existing in our country,and somemasonry buildings are of high historical and heritage value.Due to the factors of long timein bad repair,natural disasters and building renovation or expansion,lead to some masonrystructure cracked and damaged,and don’t meet the requirements of the current seismicfortification that affecting the normal use of masonry structure seriously.Therefore,the studyof the technique for masonry structure reinforcement has great engineering significance.Thefiber reinforced polymer (FRP) reinforcement technique has been widely used in the fieldof masonry structure reinforcement at home and abroad in recent years as its advantages oflighter quality,higher strength,quicker construction speed and occupy less space.As a newtype of reinforcement material,the research and application of basalt fiber reinforcedpolymer (BFRP) is rare in the fields of masonry structure reinforcement.In this article,based on the aseismatic experiment of four brick masonry walls rei-nforced with BFRP under low-cyclic lateral loading,the failure mechanism and aseis-matic behavior of the walls in different ways of strengthening and different loadinglevels are comparatively analyzed.the failure pattern,bearing capacity,deformation perf-ormance,energy dissipation,strain of fiber and so on are analyzed comprehensively,rei-nforcement effect of the different ways of strengthening are compared.The experimental results show that the method of masonry walls strengthened withBFRP can enhance the ultimate bearing capacity in varying degrees and ductility,heightenthe integrity,delay the stiffness degradation,thereby improve the seismic performance.Thetensile strength of BFRP and the shear bearing capacity of wall strengthened with "X" typecan present much more than "#" type,so the reinforcement effect of the former is better thanthe latter.The more damaged of masonry wall before reinforced,the less obvious ofimprovement its shear bearing capacity and the seismic performance after reinforced withBFRP.On the basis of experimental study,the simplified analytical models of two types ofreinforcement are established,and corresponding calculative formulas are broughtforward.It is proved that the results of calculation using the formulas in this paper and thetest datas are anastomotic in a certain extent,the formulas are capable to be applied inpractical engineering,and provide a reference for the designers to use.