NEESR Planning/Collaborative Research: Engineered Timber Structural Systems for Seismically Resilient Tall Buildings

为了在美国高地震活动地区建造具有弹性的8至14层木结构建筑，该规划拨款将抗震荷载系统的创新概念与一种称为交叉层压木材（CLT）的新型大型木结构组件相结合，研究三种具有弹性的高层CLT建筑结构系统：(a)单层预应力重定心墙，(b)多层分段摇墙，(c)带有附加阻尼装置的可变形地板隔板。这些系统将沿着建筑物的高度垂直分布，将可变形面板或层与相对刚性和刚性的面板或层结合起来，以利用CLT的性能，实现快速施工，并限制更高模式的影响。根据其在组件级测试和系统级模拟中的表现，将选择具有经济竞争力的有前途的系统进行后续研究的全面实验调查。这个规划阶段的研究将产生关于弹性、多层面板系统的基本知识，这些系统有可能改变一般高层建筑的抗震设计。随着美国地震高发地区的城市密集化，人们自然需要能够在大地震中以最小的破坏和中断幸存下来的高层建筑。CLT是一种天然的可持续材料，已在欧洲和澳大利亚用于快速建造多层建筑。然而，现有的多层CLT建筑仅限于低地震活动性地区，因为世界范围内没有高层CLT建筑的抗震设计方法。在美国太平洋西北地区，由于CLT作为一种潜在的本地采购、可持续发展和经济上具有竞争力的建筑材料的吸引力，人们对在8至14层的住宅和商业建筑中使用CLT产生了极大的兴趣。结合研究和设计界的专业知识，该项目将通过对三种适用于高地震活动区高层CLT建筑的潜在结构系统进行原型设计，通过实验和模拟比较它们的性能，并开发基于性能的抗震设计方法来解决这一社会需求。一旦在本研究中选择了最佳系统，并在随后的研究中进行了全面验证，预计在大约六到八年内，弹性的高层CLT建筑将成为西海岸城市的一种选择。除了为参与项目的学生提供研究培训外，该项目还将提供教育资源，向学生、利益相关者和公众介绍这种新的可持续建筑类型。该项目的数据将存档，并通过NEES数据储存库向公众提供。该奖项是国家减少地震灾害计划（NEHRP）的一部分。

To enable resilient, eight to fourteen story, timber buildings in regions of high seismicity in the United States, this planning grant combines innovative concepts in seismic load resisting systems with a new form of a mass timber structural component, called cross laminated timber (CLT), to research three potential structural systems for resilient, tall CLT building construction: (a) single-story, pre-stressed re-centering walls, (b) multi-story, segmental rocking walls, and (c) deformable floor diaphragms with supplemental damping devices. These systems will be distributed vertically along the height of the building, combining deformable panels or layers with relatively rigid and stiff ones, to leverage CLT behavior, enable rapid construction, and limit the impact of higher modes. Based on their performance in component-level testing and system-level simulation conducted as part of this research, promising systems that are economically competitive will be selected for full-scale experimental investigation in follow-on research. This planning phase research will generate fundamental knowledge on resilient, multi-story panelized systems that have the potential to transform the seismic design of taller buildings in general. As urban densification occurs in U.S. regions of high seismicity, there is a natural demand for tall buildings that can survive large earthquakes with minimal damage and interruption. CLT is a naturally sustainable material that has been used in Europe and Australia to rapidly construct multi-story buildings. However, existing multi-story CLT constructions were limited to regions of low seismicity because there is no seismic design methodology for tall CLT buildings worldwide. In the U.S. Pacific Northwest, there is significant interest in utilizing CLT in eight to fourteen story residential and commercial buildings due to its appeal as a potential locally sourced, sustainable, and economically competitive building material. With combined expertise from the research and design community, this project will address this societal need by prototyping three potential structural systems that are suitable for tall CLT buildings in high seismicity regions, comparing their performance through experimentation and simulation, and developing performance-based seismic design methods for their implementation. Once the optimal systems are selected in this study and verified at full-scale in subsequent research, it is envisioned that a resilient, tall CLT building will become an option for west coast cities in about six to eight years. In addition to providing research training for students working on the project, the project will deliver educational resources to introduce this new sustainable building type to students, stakeholders, and the general public. Data from this project will be archived and made available to the public through the NEES data repository. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).