Abstract Many existing steel moment-resisting frames were constructed before the provisions of modern seismic codes; therefore, they are likely to exhibit high vulnerability to earthquakes due to their inadequate ductility design, hence low energy dissipation capacity. Public concern has been raised about the development of a reliable code-based framework for assessing existing structures, however, previous research has shown that the current European code EC8–3 may not be sufficient and requires urgent improvements. Particular attention should be paid to the contribution from infill walls in steel buildings, especially those made of masonry, and beam-column connections, as they play a significant role in the structural performance under earthquakes. To this end, an updated assessment procedure, which is an extension of the current procedure in EC8–3 but with several improvements to the non-linear analysis methods, is proposed in this paper and is applied to an existing steel building as a case study. The building is a three-storey steel moment-resisting frame located at Amatrice in Central Italy, which survived the recent 2016–2017 Central Italy earthquakes. Refined 3D models of the case study building, which account for the effects of infill walls and column panel zones, were implemented in a refined finite element platform. The effects of masonry infills on structural components, such as beams and columns, were investigated through non-linear analysis methods. The results emphasise the significance of including masonry infills in the numerical model for seismic assessment especially when an optimised retrofit solution is needed.

中文翻译：

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现有带砌体填充钢框架的抗震评估

摘要 现有的钢结构抗弯框架很多都是在现代抗震规范规定之前建造的；因此，由于延展性设计不足，它们很可能表现出对地震的高度脆弱性，因此能量耗散能力低。公众对开发用于评估现有结构的可靠的基于代码的框架提出了担忧，但是，先前的研究表明，当前的欧洲代码 EC8-3 可能不够充分，需要紧急改进。应特别注意钢结构建筑中填充墙的贡献，尤其是由砖石制成的填充墙和梁柱连接，因为它们在地震下的结构性能中起着重要作用。为此，更新的评估程序，这是 EC8-3 中当前程序的扩展，但对非线性分析方法进行了一些改进，在本文中提出，并作为案例研究应用于现有的钢结构建筑。该建筑是一座三层高的钢制抗弯框架，位于意大利中部的 Amatrice，在最近的 2016-2017 年意大利中部地震中幸存下来。案例研究建筑的精制 3D 模型在精制的有限元平台中实施，该模型考虑了填充墙和柱板区域的影响。通过非线性分析方法研究了砌体填充物对梁和柱等结构构件的影响。结果强调了在地震评估数值模型中包含砌体填充物的重要性，尤其是在需要优化改造解决方案时。