Although in the last decades the applicable regulations for the design of steel structures have been deeply improved accounting for modern design approaches and technologies, in a few industrial fields, concepts and formulations derived from centuries-old experience are even nowadays the governing rule. This very often limits the potential offered by the technological innovations in high-performance material, such as quenched and tempered (QT) steels. After having verified in the scientific literature, in the commercial one and in several open material databases that some main data necessary to the comprehensive characterization of QT steel used in building large metal structures are lacking, an extensive experimental campaign was undertaken to achieve an updated and specific fatigue strength characterization for certain types of materials. The aim is to overcome the strict requirements of current regulations on the application of both parent QT materials and welded homogeneous and heterogeneous joints between different steel strength. The experimental campaign allowed filling the knowledge gap as well as providing further understanding whether the use of high-strength steel is effective in the improvement of performances of large steel structures, whose fabrication procedures are typical of building sites rather than workshops. Their extensive application in current building practice is expected to be highly beneficial in terms of weight and costs.

尽管在过去的几十年中，考虑到现代设计方法和技术，钢结构设计的适用法规已经得到了极大的改进，但在一些工业领域，从几百年来的经验中衍生出的概念和配方甚至如今仍是主导原则。这通常会限制高性能材料（例如调质（QT）钢）中的技术创新所提供的潜力。在科学文献中，在商业数据库和几个开放材料数据库中进行验证之后，缺乏用于建筑大型金属结构的QT钢的综合表征所必需的一些主要数据，进行了广泛的实验，以实现更新和某些类型材料的特定疲劳强度表征。目的是要克服现行法规对母体QT材料以及不同钢强度之间焊接的均质和异质接头的应用的严格要求。该实验活动填补了知识空白，并进一步了解了使用高强度钢是否有效地改善了大型钢结构的性能，大型钢结构的制造程序是建筑工地而不是车间的典型操作。在重量和成本方面，它们在当前建筑实践中的广泛应用有望带来极大的好处。该实验活动填补了知识空白，并进一步了解了使用高强度钢是否有效地改善了大型钢结构的性能，大型钢结构的制造程序是建筑工地而不是车间的典型操作。在重量和成本方面，它们在当前建筑实践中的广泛应用有望带来极大的好处。该实验活动填补了知识空白，并进一步了解了使用高强度钢是否有效地改善了大型钢结构的性能，大型钢结构的制造程序是建筑工地而不是车间的典型操作。在重量和成本方面，它们在当前建筑实践中的广泛应用有望带来极大的好处。