Masonry bridges are vulnerable structural systems to the ground motion excitation and their survival in case of such incidents has to be studied in detail. In this work, a simplified model for dynamic analysis of masonry bridges based on rocking motion of rigid blocks is proposed. Using this model, nonlinear time integration analysis on these bridges can be done with ease and in a short time. The proposed model was used in evaluation of seismic performances of a monumental masonry bridge subjected to both horizontal and vertical seismic actions. The study shows the importance of vertical component of ground motion in determination of internal forces and shear sliding deformation at bottom of the bridge’s pier. The proposed model has also shown its ability in defining the effectiveness of a seismic retrofit approach for the same bridge system in a comparative study. According to this investigation, seismic performances of the bridge can be significantly improved in case of adding ductility to its deck assembly.

中文翻译：

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地震作用对砌体拱桥影响研究的简化模型

砌体桥梁是易受地面运动激励的结构系统，必须详细研究它们在发生此类事件时的生存情况。在这项工作中，提出了一种基于刚性块摇摆运动的砌体桥动力分析简化模型。使用该模型，可以在短时间内轻松完成对这些桥梁的非线性时间积分分析。所提出的模型用于评估一座巨大的砌体桥在水平和垂直地震作用下的抗震性能。研究表明地震动的垂直分量在确定桥墩底部的内力和剪切滑动变形中的重要性。在比较研究中，所提出的模型还显示了其在为同一桥梁系统定义抗震改造方法的有效性方面的能力。根据这项调查，在增加桥面组件的延展性的情况下，可以显着提高桥梁的抗震性能。