Structural design criteria for road bridges made of UHPC large prefabricated parts - approaches to possible CO2 savings potential in bridge construction

Michael Olipitz
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引用次数: 2

Abstract

The future development of girder bridges is determined by the goals of more sustainable and more resource-efficient forms of construction, which can be achieved by optimizing material, structure and manufacture. The practice of early, costly repairs or replacement buildings, which has been common in reinforced concrete construction for decades, allows the realization to mature that the reinforced concrete material for heavily exposed structures in the infrastructure sector must be replaced by a more efficient material and its construction method. In materials research in the 21st century, the UHPC (ultra high performance concrete) has become the preferred option for constructive use in bridge construction and, when used appropriately, offers many possibilitiesThe UHPC combines the advantages of concrete construction with those of steel construction and is also more durable. The main focus is on the structural detailing and application of UHPC prefabricated parts appropriate to the material and the associated reduction in susceptibility to corrosion, the main disadvantage of concrete bridges.The use of UHPC-bridgefamilyIntegral in bridge construction should, in addition to a possible longer service life, primarily enable resource savings and the associated savings in CO2 consumption compared to reinforced concrete construction. For an example of 170m long span bridge structure, the article shows a comparison between the reinforced concrete construction and the UHPC construction, both in terms of mass and energy consumption.The structural optimization of the flat UHPC side wall is done on the one hand by adapting the panel thickness and by making targeted openings. In the following, some of the construction-specific details are presented, such as the fixture and the joint detail for decoupling the roadway plate and the longitudinal structure. The presented construction of the UHPC-bridgefamilyIntegral is intended on the one hand to show the optimization possibilities for girder bridges in the medium span range and on the other hand the advantages of UHPC in terms of sustainability and resource efficiency as well as the possibilities of an aesthetic formulation for future applications.
由UHPC大型预制件制成的公路桥结构设计标准-桥梁建设中可能的二氧化碳节约潜力的方法
梁桥的未来发展是由更可持续和更节约资源的建设形式的目标决定的,这可以通过优化材料、结构和制造来实现。几十年来,在钢筋混凝土施工中常见的早期、昂贵的维修或更换建筑物的做法,使人们认识到,在基础设施部门中,用于大量暴露结构的钢筋混凝土材料必须被更有效的材料及其施工方法所取代。在21世纪的材料研究中,UHPC(超高性能混凝土)已成为桥梁建设中建筑用途的首选,如果使用得当,它提供了许多可能性。UHPC结合了混凝土结构和钢结构的优点,也更耐用。主要重点是结构细节和适用于材料的UHPC预制件的应用,以及相关的腐蚀敏感性降低,这是混凝土桥梁的主要缺点。与钢筋混凝土结构相比,在桥梁建设中使用UHPC-bridgefamilyIntegral除了可以延长使用寿命外,还可以节省资源和相关的二氧化碳消耗。本文以170m大跨度桥梁结构为例,对钢筋混凝土结构与超高性能混凝土结构在质量和能耗方面进行了比较。平面UHPC侧壁的结构优化一方面是通过调整面板厚度和有针对性的开孔来完成的。在下面,介绍了一些具体的施工细节,例如用于解耦巷道板和纵向结构的夹具和接缝细节。UHPC- bridgefamilyintegral的构建一方面是为了展示中跨度范围内梁桥的优化可能性,另一方面是UHPC在可持续性和资源效率方面的优势,以及未来应用的美学配方的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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