Shaking table tests and numerical simulation for brick masonry structure reinforced with polypropylene mesh cement mortar coating
LIU Zuqiang1,2,LIANG Yuqiang1,ZHANG Fengliang3,XUE Jianyang1,2
1.School of Civil Engineering,Xi’an University of Architecture & Technology,Xi’an 710055,China;
2.MOE Key Lab of Structural Engineering and Earthquake Resistance,Xi’an University of Architecture & Technology,Xi’an 710055,China;
3.Shaanxi Architecture Science Research Institute Co.,Ltd.,Xi’an 710082,China
Abstract：Taking a one-story brick masonry structure in Lantian county, Shaanxi province as the prototype, the 1/2 scale test model was manufactured and strengthened by polypropylene grid cement mortar coating. Shaking table tests were carried out on the strengthened model, and its failure process and failure pattern under earthquake action were analyzed. Based on the tests, the finite element analysis (FEA) model of brick masonry structure strengthened by polypropylene grid cement mortar coating was established by using ABAQUS. The dynamic characteristic, dynamic response and seismic damage, which were obtained by calculation, were compared with test results, and the rationality of the FEA model was verified. And then the parametric analysis about strengthened or not, the strength of surface cement mortar and the spaces of polypropylene grid was carried out. The results showed that the damage of brick masonry structure strengthened by polypropylene grid cement mortar coating mainly occurred at the corner of door and windows, the junction of longitudinal wall and transverse wall and the part of longitudinal wall below the purlin. The calculated results agreed well with the test results, and could better reflect the mechanical performance of strengthened model under earthquake action. The strengthening method of polypropylene grid cement mortar coating could suppress the appearance and development of cracks, reduce the dynamic response and effectively improve the seismic performance of brick masonry structure. With the strength of surface cement mortar increasing and the spaces of polypropylene grid decreasing, the seismic damage and dynamic response of strengthened model both decreased gradually.
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