EXPERIMENTAL AND NUMERICAL INVESTIGATION OF IN-PLANE SHEAR BEHAVIOR OF CFRP-STRENGTHENED MASONRY WALLS WITH DOOR OPENINGS

摘要

Masonry structure is often vulnerable for seismic loads, especially the masonry member with window or door openings. This investigation mainly focuses on in-plane shear behaviours of masonry walls with door openings strengthened with CFRP sheet. Strengthening was attained by the adhesion of CFRP sheet to wall surface. The test program of 3 specimens with door openings subjected to reversed cyclic shear loads is reported. The crack propagation, the hysteretic loops of load-deformation relationships were obtained. The failure mechanism of strengthened wall and the strengthening effects with different CFRP scheme were consequently clarified. The test results show that the proposed retrofitting technique is fairly effective for seismic strengthening masonry walls and guarantees the safety of door openings as well. In addition, the numerical analysis of the test specimens was performed as a validation of test observations. The laminated shell elements, face-face flexible contact elements and spring elements were used to establish the connection between bricks and mortar, the bonding between CFRP sheets and wall surface. It can be concluded that some results of numerical analysis considerably accord with the test results. The effectiveness of CFRP strengthening on the increase of in-plane shear capacity and deformation resistance of wall with door openings is also proved in this numerical study.