Abstract The strengthening of masonry arch bridges, which account for a significant portion of the railway and road bridges in the world’s infrastructure network, is a pressing need for the operators of such networks, and even more so in the seismic areas. As any interruptions to road and especially rail traffic are particularly costly, and consequently the most suitable solution involves the design of a strengthening system applied to the intrados of the masonry arch bridge. However, in these circumstances a more compatible and reversible solution compared to traditional strengthening techniques or FRP (fiber Reinforced Polymer) systems involves the use of FRCM (Fiber Reinforced Cementitious Matrix). This work thus examines the effectiveness of FRCM strengthening on the intrados of masonry arch bridges, taking into account the actual geometric relationships that characterise the arches of bridges and considering the effect of Coulomb friction. The results obtained using lower bound limit analysis highlight the optimal conditions for the use of this strengthening, and the situations in which, due to the actual geometry of the bridges and the friction coefficient value, the use of this strengthening system would not be recommended.

中文翻译：

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Intrados FRCM加固单跨砌体桥的水平承载力

摘要 砌体拱桥在世界基础设施网络中占铁路和公路桥梁的很大一部分，加强砌体拱桥是此类网络运营商的迫切需要，在地震区更是如此。由于道路特别是铁路交通的任何中断都特别昂贵，因此最合适的解决方案涉及设计应用于砖石拱桥内拱的加固系统。然而，在这些情况下，与传统强化技术或 FRP（纤维增强聚合物）系统相比，更兼容和可逆的解决方案涉及使用 FRCM（纤维增强水泥基体）。因此，这项工作检查了 FRCM 加固对砌体拱桥内拱的有效性，考虑表征桥梁拱的实际几何关系并考虑库仑摩擦的影响。使用下限分析获得的结果突出了使用这种加固的最佳条件，以及由于桥梁的实际几何形状和摩擦系数值，不推荐使用这种加固系统的情况。