超高性能水泥基复合材料点状嵌缝加固条石砌体墙抗震性能试验研究OA

Long-stone block(rough-dressed stone)masonry walls,as the vertical load-bearing and lateral-force-resisting components of stone masonry structures,can be effectively strengthened by reinforcing their mortar joints to improve the seismic resistance.Leveraging advancements in new materials,this study proposed the use of ultra-high performance engineered cementitious composite(UHP-ECC)combined with a novel dot-embedded mortar joint reinforcement technique(localized joint filling)for long-stone block walls.To investigate the seismic performance of reinforced stone walls,quasi-static tests were conducted on five stone walls with an aspect ratio of 0.54,including four reinforced walls and one unreinforced wall,focusing on the effects of vertical compressive stress and reinforcement configurations(single-sided and double-sided).Key findings include:dot-embedded reinforcement effectively delays the crack propagation in mortar joints and reduces the mortar spalling.The double-sided dot-embedded reinforced walls exhibit significantly enhanced seismic performance,with peak load,peak stiffness,and cumulative energy dissipation increased by 171％,73％,and 85％,respectively.Higher vertical compressive stress markedly improves load-bearing capacity and energy dissipation.Under the same horizontal dot-embedded reinforcement area,single-sided and double-sided reinforcement configurations show no significant difference in seismic performance.A shear capacity calculation formula for UHP-ECC dot-reinforced long-stone block walls was proposed.The calculated results show good agreement with experimental values,and the error is within 10％.