Displacement-based design of cross-laminated timber structures

虽然在中高层建筑中使用木材的好处是毋庸置疑的，但在缺乏适当的设计指导方面也存在明显的缺陷。克服这些公认的缺陷，将使木材及其木制品衍生品进一步扩展到非住宅建筑领域。交叉叠层木材(CLT)是一种新兴的大批量木材产品，与轻木结构相比，它在承载能力、建筑物理性能和预制水平方面具有一系列优势。因此，CLT为包括大型和高层住宅和商业建筑在内的许多结构应用提供了一种有前途的解决方案。从工程角度来看，特别令人担忧的是，缺乏可靠的模型来预测CLT建筑在地震和风荷载下的基本动力特性和变形。就抗震问题而言，按照当前基于性能的设计思想，新结构需要同时满足安全和损伤极限状态要求。直接基于位移的设计(DDBD)方法代表了确保实现多个性能目标的合理设计选择。将解决的问题是为多层CLT结构提供DDBD设计指南，在单个结构构件和整个施工系统之间建立直接联系，并直接评估它们的变形水平。在项目结束后，公司将更好地了解如何将DDBD应用于建筑师和开发人员对应用CLT系统感兴趣的项目。

Although the benefits of using timber in mid- and high-rise construction are undisputed, there are perceivedshortcomings with respect to the corresponding lack of appropriate design guidance. Overcoming theseperceived shortcomings will allow timber, and its wood product derivatives, to further expand into thenon-residential construction sector. Cross-laminated Timber (CLT), an emerging mass-timber product, offers aseries of advantages in terms of load-carrying capacity, building physics performance and level ofprefabrication compared to light-frame wood construction. As such CLT constitutes a promising solution fornumerous structural applications, including for large and tall residential and commercial buildings.Of specific concern from an engineering perspective is the absence of reliable models for predictingfundamental dynamic characteristics and deformation of CLT buildings under seismic and wind loads. Withrespect to the seismic problem, in accordance with the current performance-based design philosophy, newstructures need to satisfy both safety and damage limit state requirements. The direct displacement-baseddesign (DDBD) approach represents the rational design choice to ensure multiple performance objectives aremet.The company-specific problem that will be addressed is the provision of DDBD design guidance formulti-storey CLT structures, establishing a direct link between the single structural member and theconstruction system as a whole and directly assessing their level of deformation. After the project conclusion,the company will have a better understanding how to apply DDBD to projects where architects and developersare interested in applying CLT systems.