This paper reports on a study performed on steel moment-resisting frame buildings with the aim of evaluating the safety margins against collapse of buildings designed according to Eurocode 8 (EC8) when subjected to maximum considered earthquake ground motions. To this end, the methodology proposed in FEMA P695 is employed. A set of 360 archetype buildings are designed according to EC8 using code-prescribed behaviour factors for medium and high ductility class structures. Additionally, behaviour factors determined according to an Improved Force-Based Design (IFBD) methodology are also adopted. IFBD allows for a more rational selection of the behaviour factor and is fully compliant with the EC8 prescriptions. The results from the seismic performance assessment of the structures allow for an improved understanding of the seismic behaviour of steel MRFs designed according to EC8 and highlight the efficiency that is achieved with the adoption of the IFBD methodology, both in terms of reductions of steel weight as well as in terms of the consistency between the design assumptions and the ductility demand that is explored from the buildings. Moreover, the results also indicate that moment-resisting frame buildings designed according to EC8 are characterized by acceptable safety margins against collapse.

中文翻译：

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根据欧洲规范 8 设计的钢弯矩框架的塌陷性能评估

本文报告了一项对钢抗弯框架建筑进行的研究，旨在评估根据欧洲规范 8 (EC8) 设计的建筑在承受最大考虑地震地面运动时的抗倒塌安全裕度。为此，采用 FEMA P695 中提出的方法。一组 360 座原型建筑是根据 EC8 使用规范规定的中、高延展性等级结构的行为因素设计的。此外，还采用了根据改进的基于力的设计（IFBD）方法确定的行为因素。 IFBD 可以更合理地选择行为因素，并且完全符合 EC8 规定。结构抗震性能评估的结果有助于更好地了解根据 EC8 设计的钢 MRF 的抗震性能，并强调采用 IFBD 方法所实现的效率，无论是在减轻钢重量方面还是在以下方面：以及设计假设与建筑物探索的延展性需求之间的一致性。此外，结果还表明，根据 EC8 设计的抗弯框架建筑具有可接受的防倒塌安全裕度。