Disproportionate collapse resistance of CLT buildings

该项目属于EPSRC工程研究领域的福尔斯。该项目的持续时间预计为3.5年，于2025年春季结束。用一种相对年轻的建筑材料--交叉层压木材（CLT）设计和建造的建筑越来越受欢迎。CLT建筑有助于实现到2050年的净零排放承诺-减少建筑行业的碳足迹，提供舒适的生活空间，比使用任何其他建筑材料更快，更经济。目前关于木结构建筑不相称抗倒塌的设计准则适应了混凝土和钢结构建筑的现有研究，而没有考虑木材的固有材料特性。不成比例倒塌是一种结构倒塌，其中初始局部失效（例如柱或墙的损失）导致与初始原因不成比例的链式损坏（例如结构跨间的倒塌）。木材是一种轻质材料，其力学性能取决于动力效应，其破坏机制通常是脆性（非韧性）。另一层复杂性包括考虑木材的高材料可变性。该项目的目的是研究CLT建筑物的抗倒塌能力，包括连接的延性、旋转能力和强度、CLT楼板的膜作用和力学性能。实验和数值计算工作将采用验证和集成设计方法，旨在建立CLT建筑物不均匀倒塌设计的设计指南。从连接到组件和系统级的实验将采用新颖的测量技术，从而实现数值模型的精确校准。这个博士项目是一个独特的研究机会，以推进木材研究，通知和改进工程指南，并有助于技术和非技术社区的发展，安全和可持续地使用CLT建筑。我们已与两个业界伙伴建立伙伴关系，以支持这项研究计划，并已开始与其他感兴趣的持份者和新兴持份者进行沟通，目的是扩大现有的伙伴关系网络

This project falls within the EPSRC Engineering research area. Project's duration is anticipated to be 3.5 years, ending in Spring 2025. Buildings designed and constructed with a relatively young construction material - cross laminated timber (CLT) are increasingly popular. CLT buildings contribute to the Net Zero commitment by 2050 - reducing the carbon footprint in the building sector, offer comfortable living spaces, are built faster and more economically than using any other construction material. Current design guidelines on disproportionate collapse resistance of timber buildings adapt existing research on concrete and steel buildings without considering the inherent material properties of timber. Disproportionate collapse is a structural collapse where an initial local failure (e.g. loss of a column or a wall) causes a chain type damage disproportionate to the initial cause (e.g. collapse of structural bays). Timber is a light-weight material, its mechanical properties depend on dynamic effects and its failure mechanisms are usually brittle (non-ductile). An additional layer of complexity comprises consideration of high material variability of timber. The aim of the project is to study the collapse resistance of CLT buildings accounting for the ductility, rotational capacity and strength of the connections, membrane action of the CLT floor and mechanical properties. A validation and integration design approach will be adopted for the experimental and numerical work, aiming at establishing design guidelines on the design against disproportionate collapse of CLT buildings. Experiments ranging from connection to component and system level will adopt novel measurement techniques enabling an accurate calibration of numerical models. This PhD project is a unique research opportunity to advance timber research, inform and improve engineering guidelines and contribute to development of technical and non-technical communities about safe and sustainable use of CLT in construction. Partnerships to support this research project have been established with two industry partners and communication has started with other interested and emerging stakeholders with the aim to expand the current partnership network