Performance-Based Optimisation of Novel Lightweight Steel Frame Systems for Rapid, Economical and Sustainable Construction

冷弯薄壁型钢结构以其自重轻、施工速度快、可回收利用等优点，为传统建筑技术提供了一种经济、可持续的替代方案，在现代建筑施工中得到越来越广泛的应用。然而，在广泛应用于现代建筑之前，典型的CFS墙板结构具有以下局限性：1)CFS构件和节点的低抗屈曲和延性；2)CFS结构体系没有通用的优化方法，能够同时考虑制造和施工约束；3)广泛依赖固定承重墙。这项研究的主要目的是开发一种新的基于性能的优化框架，以解决与复杂的CFS结构系统相关的具有挑战性的优化问题，包括元件和结构级别。该框架将用于开发适用于高层建筑并对极端荷载条件具有弹性的新一代高性能双墙框架CFS系统。项目的总体目标是：1-提高CFS结构系统的强度和延性，以提高在极端事件(如爆炸和强烈地震)下的抗倒塌能力和整体安全性；2-通过开发特殊连接和高性能的双墙框架系统，通过先进的CFS截面优化，考虑尺寸和制造限制，降低结构重量和建造成本，并开发新的基于性能的优化框架，以获得具有成本效益的CFS结构，在正常使用和极限状态下具有更好的结构性能。3-通过开发优化的CFS框架系统来提高结构和建筑设计的灵活性，消除(或减少)对固定CFS承重墙板的需求。拟议的研究成果将为英国建筑业带来竞争优势，并将通过开发更高效的轻钢结构体系来对英国经济增长产生长期影响，这些体系可以降低整体建筑成本，并提供更高的强度和延展性。这项工作将与英国关键的CFS行业合作进行。计划开展工业联络和传播活动，包括一次项目会议，以确保新技术的采用，并使国际研究人员和英国组织受益。

Cold-formed steel (CFS) structures offer an economic and sustainable alternative to traditional construction techniques, and are increasingly adopted in modern building construction due to their light weight, speed of construction and recyclability. However, typical CFS wall-panel structures have the following limitations that should be addressed before they can be widely used in modern building construction: 1) Low buckling resistance and ductility in CFS members and joints; 2) No generic method for optimisation of CFS structural systems, capable of taking into account both manufacturing and construction constraints; 3) Extensive reliance on fixed load-bearing walls. The main aim of the research is to develop a novel performance-based optimisation framework to address the challenging optimisation problems associated with complex CFS structural systems at both element and structural levels. The framework will be used to develop a new generation of high-performance dual wall-frame CFS systems, which are suitable for tall buildings and resilient to extreme load conditions. The overall objectives of the project are to: 1- Enhance strength and ductility of CFS structural systems to increase collapse resistance and overall safety under extreme events (such as blast and strong earthquakes), through the development of special connections and high-performance dual wall-frame systems.2- Decrease structural weight and construction cost through advanced CFS section optimisation, accounting for dimensional and manufacturing limitations, and by developing a novel performance-based optimisation framework to obtain cost-effective CFS structures with better structural performance at serviceability and ultimate limit states. 3- Increase structural and architectural design flexibility by developing optimised CFS frame systems that eliminate (or reduce) the need for fixed CFS load-bearing wall panels.The output of the proposed research will give a competitive advantage to the UK construction sector and will have a long term impact on UK economic growth by developing more efficient light-weight steel structural systems that can reduce overall construction costs and provide higher strength and ductility. The work will be conducted in partnership with key UK CFS industries. Industrial liaison and dissemination activities, including a project conference, are planned to ensure the take-up of the new technology and benefit international researchers and UK organisations.