Contrast Experimental Research On Aseismatic Behavior Of Masonry Walls Strengthened With Cfrp And Steel-Meshed Cement Mortar

Masonry structure is an important kind of structure widely used in building construction, and the civil buildings were used almost masonry structure type before the 1980s in China. The masonry structure easily lead to brittle failure due to its poor shearing, tensile and flexural performance, so the aseismatic behavior of masonry structure is lower. Especially in Wenchuan earthquake the most serious damage occur in schools, so the state enhance emphasis on aseismatic strengthening of primary and secondary schools. With"the safety engineering of primary and secondary schools"in Hebei province as the background, in order to provide the experimental basis and technical support for popularization and application of masonry walls strengthened with CFRP in"the safety engineering of primary and secondary schools", the experimental study and theoretical analysis was undertaken.At first, the development status of masonry structure in china and existing strengthening masonry technology are summarized in this paper, and the research situation at home and abroad of masonry wall strengthened with CFRP and steel-meshed cement mortar are introduced. Then based on the aseismatic experiment of four brick masonry walls strengthened with CFRP and steel-meshed cement mortar under low-cyclic lateral loading, the failure mechanism and aseismatic behavior of the walls are comparatively analyzed. The destructive mode, deformation performance, energy dissipation capacity and ultimate bearing capacity are comprehensively analyzed for the strengthening walls and the reinforcement effect of different schemes is compared.The experimental results show that the indicators such as cracking load, ultimate load, ductility and energy dissipation capacity of the walls strengthened with CFRP and steel-meshed cement mortar are improved significantly, compared with no strengthened wall. The shearing contribution of CFRP's unit area to wall strengthened with "X" type CFRP is more than "#" type, so the reinforcement effect of the former is better than the latter. For the wall strengthened with steel-meshed cement mortar, the steel mesh, cement mortar and brick wall work together with co-deformation which has certain elastoplasticity and this strengthening method can notably increase horizontal ultimate load and the stiffness of the walls. Based on the experimental study, the simplified analytical models for brick walls strengthened with CFRP and steel-meshed cement mortar are established and corresponding calculative formulas are brought forward. It is proved that the results of calculation using the formulas in this paper and the test datas are anastomotic in a certain extent, and the formulas are capable to be used in engineering which laid a favorable theoretical foundation for more comprehensive analysis of reinforced masonry structure in future.