Experimental Study On Compressive Behavior Of Brick Masonry Column Strengthened With Textile Reinforced High Ductile Concrete

Masonry structure has a long history and wide application,but its integrity,self weight,tensile and shear strength are low,resulting in its poor seismic performance.Therefore,a large number of existing masonry structures need to be strengthened to improve their bearing capacity and seismic performance.Textile Reinforced High Ductile Concrete(TR-HDC)is a kind of high-performance fiber-reinforced composite material,which has the characteristics of high strength,high toughness,corrosion resistance,and good compatibility with the building structure.It can open up a new way for masonry structure reinforcement.In this paper,the uniaxial tensile properties of TR-HDC and the compression properties of TR-HDC reinforced short brick masonry columns are studied experimentally and theoretically.The main contents of this paper are as follows:(1)The effects of PVA content,fabric distribution ratio and matrix type on the tensile properties of TR-HDC were analyzed.The results show that: With the increase of PVA short fiber and fabric distribution rate,the specimen shows typical multi crack cracking pattern,the ultimate bearing capacity has been improved to varying degrees,and has good deformation capacity.According to the test results,the calculation formula of TR-HDC tensile strength is proposed,and the test value is in good agreement with the theoretical value.(2)Based on the static loading test of TR-HDC reinforced short brick masonry columns,the influence of different reinforcement methods,eccentricity,mortar strength and other parameters on the compression performance of the specimens is considered.The results show that TR-HDC is a good reinforcement method,which can significantly improve the bearing capacity of brick columns and the ductility and integrity of members.(3)Based on the compression test of TR-HDC strengthened brick masonry short columns,combined with relevant codes and documents,the theoretical analysis of the normal section bearing capacity of TR-HDC strengthened short columns is carried out,and the calculation value of the normal section bearing capacity under axial and eccentric pressure is calculated,which is in good agreement with the test value.