HYBRID LIGHTWEIGHT STRUCTURAL SYSTEMS FOR LOW-COST HOUSING (HYLIGHTS)

用于低成本住房的混合轻质结构系统 (HYLIGHTS)

• 批准号: EP/W026988/1
• 负责人: Leroy Gardner
• 金额: $ 56.35万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FW026988%2F1
• 关键词: HYBRID; LIGHTWEIGHT; STRUCTURAL; SYSTEMS; LOW

The legally binding UK government target to reach net zero carbon emissions by 2050 cannot be achieved without minimizing the carbon footprint of the construction sector. Over one-quarter of the world`s annual steel production is used in the construction of buildings but a study based on steel-framed designs for schools, offices and residential buildings, sourced from leading UK design consultancies, reveals the average material utilisation ratio for typical steel buildings is below 50% of their capacity. This suggests steel content in buildings could be significantly reduced by designing for minimum material, which would annually avert 214 million tonnes of carbon dioxide emissions worldwide. To reduce steel consumption in construction, the development of novel, materially efficient and sustainable lightweight structures is essential. There's a global need for housing as populations grow which creates tension with our need to cause less emissions by building less or more efficiently.Light steel frame (LSF) structures made of cold-formed steel (CFS) stud-walls and joisted floors are gaining growing popularity in modern construction practice worldwide, both in new developments and as a cost-effective and low-carbon solution for vertical extensions to existing buildings. The ease of offsite manufacturing utilising LSF structures offers many benefits compared to traditional methods, including: (a) improved quality and productivity, reduced material use, less wastage and savings of 30-50% in total construction time and associated costs; (b) flexibility for more tailored design solutions complying with the Design for Manufacture and Assembly approach; and (c) scalability for the technologies around automated construction. LSF systems can, therefore, directly contribute towards meeting the UK Government's ambitious house building commitments and reducing the initial cost of construction and whole life cost of assets, and CO2 emissions by 33% and 50%, respectively. However, the current use of LSF structural systems is limited due to critical drawbacks such as low local buckling resistance of thin-walled CFS elements, low lateral stiffness and robustness of typical LSF systems and limitations of current design and optimisation approaches to exploit their full capacity. These challenges should be addressed before LSF systems can be widely used both in the UK and overseas.

如果不最大限度地减少建筑行业的碳足迹，英国政府到 2050 年实现净零碳排放的具有法律约束力的目标就无法实现。全球年钢铁产量的四分之一以上用于建筑物的建造，但一项来自英国领先设计咨询公司的基于学校、办公室和住宅楼钢框架设计的研究揭示了建筑的平均材料利用率典型的钢结构建筑的容量低于 50%。这表明通过设计最少的材料可以显着减少建筑物中的钢材含量，这每年可以在全球范围内避免 2.14 亿吨二氧化碳排放。为了减少建筑中的钢材消耗，开发新型、高效且可持续的轻质结构至关重要。随着人口的增长，全球对住房的需求日益增加，这与我们通过减少或提高建筑效率来减少排放的需求之间产生了紧张关系。由冷弯型钢 (CFS) 立柱墙和托梁地板制成的轻钢框架 (LSF) 结构正在获得越来越多的应用在全球现代建筑实践中越来越受欢迎，无论是在新开发项目中，还是作为现有建筑垂直延伸的经济高效且低碳的解决方案。与传统方法相比，利用 LSF 结构进行场外制造的便利性带来了许多好处，包括： (a) 提高质量和生产率、减少材料使用、减少浪费并节省 30-50% 的总施工时间和相关成本； (b) 符合制造和装配设计方法的更定制设计解决方案的灵活性； (c) 自动化施工技术的可扩展性。因此，LSF 系统可以直接有助于满足英国政府雄心勃勃的房屋建设承诺，并将初始建设成本和资产的整个生命周期成本以及二氧化碳排放量分别降低 33% 和 50%。然而，由于存在一些严重缺陷，例如薄壁 CFS 元件的局部抗屈曲阻力低、典型 LSF 系统的横向刚度和鲁棒性低，以及当前设计和优化方法充分利用其能力的限制，目前 LSF 结构系统的使用受到限制。 。在 LSF 系统在英国和海外广泛使用之前，应该解决这些挑战。