As seismic activity in Korea increases, concerns over aging masonry structures grow. By 2030, over 62 % of South Korea's buildings will be more than 30 years old, with masonry structures are a dominant structural type in older structures. Due to the low tensile strength of mortar, masonry buildings are highly vulnerable to seismic loads, requiring effective retrofitting and strengthening solutions. This study evaluates the seismic strengthening effects of stiff-type polyurea (STPU) and glass fiber-strengthened polymer (GFRP) on masonry walls through shaking table tests. Three strengthening types were tested: non-strengthened (MWN), STPU-strengthened (MWP2), and hybrid GFRP + STPU-strengthened (MWPF5) specimens. The results show that MWP2 resisted up to 0.8 g PGA, twice the capacity of the non-strengthened specimens (0.4g–0.5 g PGA). The hybrid MWPF5 exhibited the highest seismic resistance, withstanding up to 1.0 g PGA, but also showed increased acceleration, indicating improved structural stiffness and potential brittle failure. The findings confirm that STPU significantly enhances ductility, energy absorption, and seismic resistance, while GFRP further improves structural seismic performance. These strengthening materials offer effective and practical retrofitting solutions for aging masonry structures vulnerable to earthquakes. Further details on the experiments and results are discussed in the paper.

中文翻译：

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STPU 加固砌体墙结构抗震荷载评价

随着韩国地震活动的增加，人们对老化的砖石结构的担忧日益增加。到 2030 年，韩国超过 62% 的建筑将超过 30 年，其中砖石结构是旧结构的主要结构类型。由于砂浆的抗拉强度低，砖石建筑极易受到地震载荷的影响，需要有效的改造和加固解决方案。本研究通过振动台试验评估了硬型聚脲 （STPU） 和玻璃纤维增强聚合物 （GFRP） 对砌体墙的抗震加固效果。测试了三种增强类型：非强化 （MWN）、STPU 强化 （MWP2） 和 GFRP + STPU 强化混合 （MWPF5） 试样。结果表明，MWP2 抵抗高达 0.8 g PGA，是未增强试样容量 （0.4g–0.5 g PGA） 的两倍。混合 MWPF5 表现出最高的抗震性，可承受高达 1.0 g 的 PGA，但也显示出更高的加速度，表明结构刚度更高，并且可能发生脆性破坏。研究结果证实，STPU 显着增强了延展性、能量吸收和抗震性，而 GFRP 进一步提高了结构抗震性能。这些加固材料为易受地震影响的老化砖石结构提供了有效且实用的改造解决方案。本文讨论了有关实验和结果的更多详细信息。