Abstract Innovations are often initiated by bridge design. In this paper out of the large variety of new solutions and developments in bridge design, the focus is on three different subjects: Especially composite constructions made of structural steel and reinforced concrete adapt very easily to the most diverse situations and lead to efficient and beautiful bridges. The requirement of time effectiveness has driven solutions with prefabrication. First, a newly developed composite section with a trapezoidal steel web and horizontally lying studs is presented. Secondly, slender structures of thin plates are usually designed according to EN 1993-1-5. In order to adapt to an optimized overall curved shape in longitudinal direction the development of new buckling rules for non-rectangular steel panels is addressed. As a third point fatigue design, which is most relevant for the bridge dimensions, is addressed. Improvements by HFMI-treatment have been verified so that advantage can now be taken especially for high strength steels that allow a more slender design. The influence of the terms of application of HFMI-treatment on the quality has been investigated in a recent project. These different developments can lead to more slender, more efficient long living steel and composite bridges that satisfy future demands of increased sustainability.

中文翻译：

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钢桥和复合桥的新发展

摘要 创新往往是由桥梁设计发起的。在这篇论文中，在桥梁设计的大量新解决方案和发展中，重点是三个不同的主题：特别是由结构钢和钢筋混凝土制成的复合结构非常容易适应最多样化的情况，并导致高效和美丽的桥梁. 对时间效率的要求推动了预制解决方案。首先，介绍了一种新开发的具有梯形钢腹板和水平放置的螺柱的复合截面。其次，薄板的细长结构通常根据EN 1993-1-5设计。为了适应纵向优化的整体弯曲形状，针对非矩形钢板制定了新的屈曲规则。作为第三点疲劳设计，解决了与桥梁尺寸最相关的问题。HFMI 处理的改进已经得到验证，因此现在可以利用优势，特别是对于允许更细长设计的高强度钢。在最近的一个项目中研究了 HPMI 处理的应用条件对质量的影响。这些不同的发展可以带来更细长、更高效的长寿命钢和复合材料桥梁，以满足未来对可持续性更高的需求。