Abstract Appropriate selection of strengthening methods for existing historic masonry structures is of utmost importance to improve the seismic behavior without altering their aesthetics. The present research was aimed to study the in-situ strengthening methods applicable to seismic strengthening for historic masonry buildings. The strengthening methods include embedment of polymer mortar, steel strips bonded by polymer mortar and a combination of both into bed joints. To assess the effectiveness of the strengthening methods, a detailed experimental investigation on one un-strengthened and four strengthened masonry walls were carried out under cyclic lateral loads. The effectiveness of strengthening methods was evaluated by comparing failure modes and seismic performance, in terms of strength, deformation capacity, stiffness degradation, energy dissipation and equivalent viscous damping. It was found that presence of high strength polymer mortar improved the deformation behavior of masonry walls, whereas, the specimens strengthened with steel strips significantly enhanced the strength, deformation and energy dissipation capacity. The adopted strengthening methods showed insignificant influence on the initial stiffness of the masonry walls. Based on the observed damage and failure, empirical expressions were established to predict the in-plane shear capacity of the strengthened masonry walls and were verified with the previous experimental results.

中文翻译：

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使用聚合物砂浆和钢带对历史砖墙进行创新的抗震加固

摘要 为现有历史砖石结构选择适当的加固方法对于在不改变其美观性的情况下改善抗震性能至关重要。本研究旨在研究适用于历史砖石建筑抗震加固的原位加固方法。加固方法包括聚合物砂浆的嵌入、聚合物砂浆粘合的钢带以及两者结合到床缝中。为了评估加固方法的有效性，在循环侧向荷载下对一个未加固和四个加固的砌体墙进行了详细的实验研究。通过比较破坏模式和抗震性能，在强度、变形能力、刚度退化、能量耗散和等效粘性阻尼。发现高强度聚合物砂浆的存在改善了砌体墙的变形行为，而用钢带加固的试件显着提高了强度、变形和能量耗散能力。所采用的加固方法对砌体墙体的初始刚度影响不大。根据观察到的损伤和破坏，建立了经验表达式来预测加固砌体墙的面内抗剪承载力，并与之前的实验结果进行了验证。钢带强化试件的强度、变形和耗能能力显着提高。所采用的加固方法对砌体墙体的初始刚度影响不大。根据观察到的损伤和破坏，建立了经验表达式来预测加固砌体墙的面内抗剪承载力，并与之前的实验结果进行了验证。钢带强化试件的强度、变形和耗能能力显着提高。所采用的加固方法对砌体墙体的初始刚度影响不大。根据观察到的损伤和破坏，建立了经验表达式来预测加固砌体墙的面内抗剪承载力，并与之前的实验结果进行了验证。