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

冷弯型钢（CFS）结构为传统建筑技术提供了一种经济和可持续的替代方案，由于其重量轻，施工速度快和可回收性，在现代建筑中越来越多地被采用。然而，典型的CFS墙板结构在广泛应用于现代建筑施工之前存在以下局限性：1)CFS构件和节点的抗屈曲性和延性较低；2)没有通用的方法来优化CFS结构系统，能够同时考虑到制造和施工的限制；3)广泛依赖固定承重墙。该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CFS结构系统在元素和结构层面相关的具有挑战性的优化问题。该框架将用于开发新一代高性能双墙框架CFS系统，该系统适用于高层建筑，并能适应极端负载条件。该项目的总体目标是：1-通过开发特殊连接和高性能双框架墙体系，提高CFS结构体系的强度和延性，以提高极端事件（如爆炸和强震）下的抗倒塌能力和整体安全性。2-考虑到尺寸和制造限制，通过先进的CFS截面优化来减少结构重量和施工成本，并通过开发一种新的基于性能的优化框架来获得具有成本效益的CFS结构，在使用性能和最终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，消除（或减少）对固定CFS承重墙板的需求，增加结构和建筑设计的灵活性。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系统对英国经济增长产生长期影响，这些系统可以降低总体建筑成本，并提供更高的强度和延展性。这项工作将与英国主要的慢性疲劳综合症行业合作进行。工业联络和传播活动，包括项目会议，计划确保新技术的采用，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.