The discussion mainly refers to the first benchmark arch with which the proposed nonlinear approach to the assessment of masonry arch bridges is compared. The proposed procedure (Brencich and De Francesco 2004) does not take into account the arch/fill interaction which, on the contrary, was found in the tests to give relevant contributions to the actual load-carrying capacity of the tested arch (Melbourne and Gilbert 1995). In addition, a kinematic limit-analysis approach would foresee a load-carrying capacity that is approximately half the experimental value, showing that the fill contribution accounts for roughly half the ultimate load of the bridge. Therefore, the good agreement between the numerical and experimental data is considered somehow troublesome.
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机译：讨论主要针对第一个基准拱，它与所提出的评估砌体拱桥的非线性方法进行了比较。拟议的程序（Brencich和De Francesco 2004）没有考虑拱/填充相互作用，相反，拱/填充相互作用在测试中被发现为测试拱的实际承载能力做出了重要贡献（Melbourne和Gilbert） 1995）。另外，运动学极限分析方法可以预见的承载能力大约是试验值的一半，这表明填充贡献大约占桥梁最终载荷的一半。因此，数值和实验数据之间的良好一致性被认为是麻烦的。
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