Disproportionate collapse resistance of CLT buildings

该项目属于EPSRC工程研究领域。项目持续时间预计为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建筑有助于到2050年实现净零排放的承诺——减少建筑部门的碳足迹，提供舒适的生活空间，比使用任何其他建筑材料建造得更快，更经济。目前关于木结构建筑不成比例抗倒塌的设计准则是根据现有的关于混凝土和钢结构建筑的研究，而没有考虑木材固有的材料特性。不成比例倒塌是一种结构倒塌，其中最初的局部破坏（如柱或墙的损失）导致与初始原因（如结构舱的倒塌）不成比例的链式破坏。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的（非延性）。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建筑的抗倒塌能力，考虑连接的延性，转动能力和强度，CLT楼板的膜作用和力学性能。实验和数值工作将采用验证和集成设计方法，旨在为CLT建筑的不成比例倒塌设计建立设计准则。从连接到组件和系统级的实验将采用新颖的测量技术，能够精确校准数值模型。这个博士项目是一个独特的研究机会，可以推进木材研究，告知和改进工程指导方针，并为技术和非技术社区在建筑中安全和可持续地使用CLT的发展做出贡献。为支持这项研究计划，我们已与两个业界伙伴建立伙伴关系，并已开始与其他感兴趣的和新兴的利益相关者沟通，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