Design guidance for balloon-framed CLT structures

气球框架 CLT 结构的设计指南

• 批准号: RGPIN-2022-03712
• 负责人: Tannert, Thomas
• 金额: $ 4.81万
• 依托单位: University of Northern British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=755957
• 关键词: Design; guidance; balloon; framed; CLT

Wood structures are on the rise! Heightened public awareness regarding the environmental impact of building and maintaining structures has dramatically increased the demand for sustainable construction methods and has initiated a resurgence in the use of wood, in particular Cross-Laminated Timber (CLT). Tall residential and non-residential CLT construction is becoming common in North America, and design provisions for encapsulated mass timber structures up to 12 stories tall have been incorporated into the National Building Code of Canada. Most previous research and the resulting design guidance in the Canadian Standard for Engineering Design in Wood is limited to platform-type construction, where one storey's ceiling forms the platform for the next storey's walls. In contrast, balloon-framed structures, where the walls are continuous over multiple storeys, offer several advantages including eliminating perpendicular-to-the-wood-grain bearing between floors and cumulative shrinkage over the building height, and requiring fewer panels to create slender panel aspect ratios and fewer connections over the height of a building. The long-term goal of my research program is to develop, and make available, reliable engineering design guidance for balloon-type CLT buildings, specifically by addressing their seismic performance and the prevention of disproportionate collapse. Within the proposed NSERC DG research program, my team, in close collaboration with the design and construction industry, will advance three immediately relevant research areas: 1) Development of novel low-damage connection systems for balloon-type CLT shear walls, such as hyperelastic bearings combined with steel rods to connect individual wall segments; 2) Development of design provisions for balloon-type CLT lateral load resisting systems consisting of concrete cores with perimeter CLT shear walls and CLT cores with braced timber (or steel) perimeter frames; and 3) Providing the proof that balloon-type CLT systems are able to develop alternative load paths in the case of sudden supporting element loss, to prevent disproportionate collapse. My team will advance these research areas through conceptual, experimental, numerical, and analytical investigations. Addressing research questions related to balloon-type CLT buildings holistically will differentiate my research program from other efforts, which tend to focus on individual subsets of these problems. The proposed program will exploit and fuel the current momentum of initiatives focused on sustainability and innovative wood construction, leverage successful research initiatives in my group, and shape future research agendas in tall wood construction provincially, nationally and globally. Ultimately, by taking leadership in this area, successful implementation of the program will have a decisive impact on the structural use of wood and will increase its market share in tall residential and non-residential buildings.

木结构正在兴起！公众对建筑和维护结构对环境影响的认识不断提高，对可持续建筑方法的需求急剧增加，并引发了木材特别是交叉层压木材（CLT）的使用复兴。住宅和非住宅 CLT 建筑在北美很常见，最高 12 层的封装大体积木结构的设计规定已纳入加拿大国家建筑规范中，并已纳入加拿大标准中的设计指南。木材工程设计仅限于平台型建筑，其中一层的天花板形成下一层墙壁的平台，相比之下，气球框架结构（墙壁在多层上连续）具有多种优点，但不包括垂直。 -地板之间的木纹承重和建筑物高度上的累积收缩，以及需要更少的面板来创建细长的面板纵横比和建筑物高度上的更少的连接我的研究计划的长期目标是开发，并为气球型 CLT 建筑提供可靠的工程设计指导，特别是通过解决其抗震性能和防止过度倒塌的问题，在拟议的 NSERC DG 研究计划中，我的团队将与设计和建筑行业密切合作。推进三个直接相关的研究领域：1）开发用于气球型CLT剪力墙的新型低损伤连接系统，例如与钢杆结合的超弹性轴承来连接各个墙段；2）开发气球型CLT剪力墙的设计规定；由带有周边 CLT 剪力墙的混凝土核心筒和带有支撑木（或钢）周边框架的 CLT 核心筒组成的横向荷载抵抗系统；以及 3) 证明气球型 CLT 系统能够在突然发生的情况下形成替代荷载路径；我的团队将通过概念、实验、数值和分析研究来推进这些研究领域，全面解决与气球型 CLT 建筑相关的研究问题，这将使我的研究项目与其他倾向于关注的项目区分开来。在这些问题的各个子集。​拟议的计划将利用和推动当前专注于可持续性和创新木结构的举措的势头，利用我小组的成功研究举措，并制定省级、国家级和全球高层木结构的未来研究议程。通过在这一领域发挥领导作用，该计划的成功实施将对木材的结构使用产生决定性影响，并将增加其在高层住宅和非住宅建筑中的市场份额。