Seismic Confinement of Brick Masonry Structure with CFRP
摘要
This research investigates the effectiveness of Carbon Fiber Reinforced Polymer (CFRP) in strengthening conventional residential masonry structures typical of rural Central Asia, where nearly 90% of buildings are unreinforced and susceptible to seismic activity. Unlike previous studies that focused on masonry cantilever walls or modified structures with openings, this study targets actual seismic behavior in unmodified structures. An economical CFRP partial bonding technique, enhanced with a CFRP anchorage system to prevent delamination, was utilized. Two unreinforced masonry structures, representing typical village rooms, were constructed at a one-third scale and subjected to lateral displacement control loading with a constant vertical load according to FEMA standards. The CFRP strengthening was applied only to the exterior walls. Results showed significant improvements in ultimate strength, deformability, and stiffness degradation, with failure primarily due to FRP strip fracture near the tie beam-column joint, effectively addressing the common issue of CFRP debonding. This study demonstrates that the CFRP partial bonding technique, when supplemented with anchorage, enhances the seismic resilience of unreinforced masonry structures, offering a practical solution for earthquake-prone regions.