The quasi-static in-plane cyclic response of two single-leaf calcium silicate unreinforced masonry piers was investigated to show the effectiveness of an innovative timber retrofit solution. The aim of the intervention is to increase the pier in-plane and out-of-plane strength and displacement capacity, thus reducing the seismic vulnerability of this typology of unreinforced masonry construction with a light, cost-effective, sustainable and reversible approach. The retrofit technique consists of a timber frame mechanically connected by means of steel fasteners to the masonry pier and building floors. Oriented strand timber boards are then nailed to the frame. In-plane quasi-static shear–compression cyclic tests were performed on two single-leaf calcium silicate brick piers with identical geometry and masonry mechanical properties: one was tested unstrengthened while the other was tested in the retrofitted configuration. The experimental results showed evident improvements in the lateral force–displacement response of the retrofitted specimen. More specifically, compared with the bare masonry pier, the retrofitted pier exhibited slightly higher stiffness, larger strength and significantly greater displacement capacity.

中文翻译：

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用木框架和木板改造的砌体桥墩的循环响应

研究了两个单叶硅酸钙未加固砌体桥墩的准静态平面内循环响应，以展示创新木材改造解决方案的有效性。干预的目的是增加桥墩平面内和平面外的强度和位移能力，从而通过轻型、成本效益高、可持续和可逆的方法降低这种无钢筋砌体结构类型的地震脆弱性。改造技术包括通过钢紧固件机械连接到砖石墩和建筑地板的木框架。然后将定向木板钉在框架上。在具有相同几何形状和砌体力学性能的两个单叶硅酸钙砖墩上进行了面内准静态剪切-压缩循环试验：一个在未经强化的情况下进行了测试，而另一个在改装配置中进行了测试。实验结果表明，改造后的试样的侧向力-位移响应有明显改善。更具体地说，与裸砌体桥墩相比，改造后的桥墩表现出略高的刚度、更大的强度和明显更大的位移能力。