STUDY ON BENDING TENSILE PERFORMANCE OF BRICK MASONRY REINFORCED WITH PP-BAND

In order to study the enhancement effect of polypropylene band (PP-band) on the bending performance of brick masonry, the bending tensile test was carried out on 216 brick masonry specimens. Combined with numerical simulation, the influences of masonry mortar strength, coating mortar strength and PP-band mesh with different mesh sizes on the bending performance of brick masonry were studied. The results show that the strength of masonry mortar has the greatest influence on the peak bending load of brick masonry. Compared with M1 strength, when the strength of masonry mortar increases to M2.5, M5, M7.5 and M10, the corresponding peak bending load amplification of continuous section brick masonry is 15.87%, 31.11%, 37.60% and 44.45%, respectively, and that of the dentiform section brick masonry is 28.95%, 46.16%, 55.19% and 56.76%, respectively. The strength of coating mortar has little influence on the peak bending load, and its main function is to enhance the bond between PP-band and brick masonry surface. The joint action of high-strength coating mortar and PP-band can effectively improve the deformation resistance ability of brick masonry. The size of PP-band mesh mainly affects the amplitude of load recovery after the fracture of brick masonry. Compared with the mesh size of 12.5 cm, when the mesh size is reduced to 7.5 cm and 5 cm, the amplification of load recovery peak value of continuous section brick masonry can reach 63.42% and 130.38%, and that of the dentiform section brick masonry can reach 73.29% and 127.66%. The PP-band reinforcement method can provide reference for seismic reinforcement of masonry structures, especially in rural areas.