Abstract The steel roof of the Pierre Mauroy Stadium in Lille (France) is supported by two mega-trusses, each 200 m long and 16 m high. The main design challenge was to propose a technique to assemble the elements of the mega-trusses with minimum welding on site to save time, with a limited number of bolts for aesthetic reasons. The members of the compression chords were assembled using full contact and those of the tension chords were joined with cover-plates and a single pin instead of multiple bolts. During erection of the mega-trusses, an unknown instability phenomenon appeared on the cover-plates used only to transmit tension forces. The lifting operations were stopped immediately to maintain safety. After verifications, it was concluded that the final design based on Eurocodes was correct for both the service conditions and construction stages. Large parametric studies with nonlinear analyses were conducted to understand the origin of this behavior. Ignoring this phenomenon would be impossible even if the tension forces were smaller for the service life. Thus, new design requirements were defined to consider the phenomenon and reinforcement was added to some cover-plates to secure the structure. This article presents the observed phenomenon, the main numerical simulations to understand the origin of the instability, and the design requirements to verify the safety of this type of joint.

中文翻译：

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新里尔体育场钢屋顶：张力板盖板不稳定性现象

摘要 法国里尔 Pierre Mauroy 体育场的钢屋顶由两个巨型桁架支撑，每个桁架长 200 m，高 16 m。主要的设计挑战是提出一种技术，以最少的现场焊接组装巨型桁架的元件，以节省时间，出于美观原因，螺栓数量有限。压缩弦杆的构件采用全接触组装，张力弦杆的构件采用盖板和单个销钉而不是多个螺栓连接。在巨型桁架架设过程中，仅用于传递张力的盖板上出现了未知的不稳定现象。起重作业立即停止，以确保安全。核实后，得出的结论是，基于欧洲规范的最终设计对于使用条件和施工阶段都是正确的。进行了非线性分析的大型参数研究以了解这种行为的起源。即使在使用寿命内张力较小，也无法忽略这种现象。因此，定义了新的设计要求以考虑这种现象，并在一些盖板上增加了钢筋以固定结构。本文介绍了观察到的现象、了解不稳定起源的主要数值模拟，以及验证此类接头安全性的设计要求。即使在使用寿命内张力较小，也无法忽略这种现象。因此，定义了新的设计要求以考虑这种现象，并在一些盖板上增加了钢筋以固定结构。本文介绍了观察到的现象、了解不稳定起源的主要数值模拟，以及验证此类接头安全性的设计要求。即使在使用寿命内张力较小，也无法忽略这种现象。因此，定义了新的设计要求以考虑这种现象，并在一些盖板上增加了钢筋以固定结构。本文介绍了观察到的现象、了解不稳定起源的主要数值模拟，以及验证此类接头安全性的设计要求。