Experimental study on seismic performance of CFRP-retrofitted earthquake-damaged masonry-infilled RC frame

doi:10.19936/j.cnki.2096-8000.20230128.010

Abstract

Abstract: In order to investigate the seismic performance of CFRP-retrofitted earthquake-damaged masonry-infilled reinforced concrete (RC) frames,three earthquake-damaged masonry-infilled RC frame specimens and one RC frame specimen were tested under low-cyclic reversed load after its CFRP reinforcement, the damage characteristics and hysteresis curves of the specimens were obtained, the seismic performance indexes of the specimens, such as bearing capacity, stiffness degradation, energy dissipation and displacement ductility were analyzed, and compared with the earthquake-damaged masonry-infilled RC frame specimens and unreinforced RC frame specimens. The results show that the peak bearing capacity of earthquake-damaged frame specimens retrofitted by CFRP can be effectively improved, the degradation level of structural stiffness is slower than that of the original specimens, and the energy dissipation capacity is also improved. The reinforcement of CFRP can restore the bearing capacity, stiffness and energy dissipation capacity of earthquake-damaged masonry-infilled RC frame with rigid connection to the level before earthquake damage. The specimen with flexible connection filled wall frame retrofitted with CFRP for earthquake damage is delayed due to the presence of rubber, which delays the strong pushing effect between the filled wall and the frame and the destruction of the filled wall, so that the frame and the masonry-infilled wall can still work together and continue to resist horizontal load. CFRP gives full play to the restraint effect under large deformation of the specimen. Its peak bearing capacity and energy dissipation capacity can be significantly improved, and its stiffness degradation is slower than that of the original specimen.

Key words: CFRP-retrofitted, earthquake-damaged masonry-infilled RC frame, seismic performance, pseudo-static test

CLC Number:

TB332

ZHANG Yongbing, WU Jianxin, DAI Baile, ZHENG Lei. Experimental study on seismic performance of CFRP-retrofitted earthquake-damaged masonry-infilled RC frame[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(1): 85-93.

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