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

为了使美国地震高发区具有弹性的8至14层木结构建筑成为可能，这项规划拨款将抗震体系的创新概念与一种名为交叉叠层木材(CLT)的新型大量木结构构件相结合，以研究三种可能用于弹性高层CLT建筑的结构体系：(A)单层预应力重定心墙，(B)多层分段摇摆墙，以及(C)带有补充减震装置的可变形楼板横隔板。这些系统将沿建筑高度垂直分布，将可变形的面板或层与相对刚性和僵硬的面板或层结合在一起，以利用CLT行为，实现快速施工，并限制更高模式的影响。基于它们在部件级测试和系统级仿真中的性能，作为本研究的一部分，将选择具有经济竞争力的有前景的系统进行全面的实验研究。这一规划阶段的研究将产生关于弹性、多层嵌板系统的基础知识，这些系统有可能改变一般高层建筑的抗震设计。由于美国地震活动频繁的地区出现了城市密集化，因此对能够在大地震中幸存下来、破坏和中断最小的高层建筑有着天然的需求。CLT是一种自然可持续的材料，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建筑仅限于地震活动较少的地区，因为世界范围内还没有针对高层CLT建筑的抗震设计方法。在美国太平洋西北部，由于CLT作为一种潜在的本地来源、可持续和具有经济竞争力的建筑材料，人们对在8到14层的住宅和商业建筑中使用CLT非常感兴趣。结合研究和设计界的专业知识，该项目将通过制作适合于高地震区高层CLT建筑的三种潜在结构系统的原型，通过实验和模拟比较它们的性能，并为其实施开发基于性能的抗震设计方法，以满足这一社会需求。一旦在这项研究中选择了最佳的系统，并在随后的研究中进行了全面的验证，预计在大约六到八年内，一座有弹性的高层CLT建筑将成为西海岸城市的一种选择。除了为参与该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、利益相关者和普通公众介绍这种新的可持续建筑类型。该项目的数据将被存档，并通过NEES数据库向公众提供。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).