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.

木结构正在上升！公众对建筑和维护结构的环境影响的认识提高了人们对可持续建筑方法的需求，并已开始使用木材的使用，特别是跨层压木材（CLT）。高个子居民和非住宅CLT建设在北美正变得普遍，并且为加拿大国家建筑法典纳入了最高12层的封装大型木材结构的设计规定。大多数先前的研究和木材工程设计标准的最终设计指南仅限于平台类型的结构，其中一个楼层的天花板构成了下一层墙壁的平台。相比之下，气球框架结构（在多层上墙都在多层上是连续的，都提供了几个优点，包括消除地板之间垂直到木的晶体轴承和建筑物高度上的累积收缩，并且需要更少的面板来创建细长的面板纵横比，以及建筑物高度上的连接更少。我的研究计划的长期目标是为气球型CLT建筑物开发并提供可靠的，可靠的工程设计指南，特别是通过解决其地震性能和预防不成比例的崩溃来开发并提供可靠的工程设计指南。在拟议的NSERC DG研究计划中，我的团队与设计和建筑行业密切合作，将推进三个立即相关的研究领域：1）开发用于气球型CLT剪切壁的新型低损伤连接系统，例如与钢棒结合使用的超弹性轴承，以连接单个墙壁段； 2）开发气球型CLT侧向载荷系统的设计配置，该系统由带有支撑木材（或钢）外膜框架的混凝土核心组成的混凝土核心和CLT核心； 3）提供证据表明气球型CLT系统能够在突然支撑元件损失的情况下开发替代的负载路径，以防止比例崩溃。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。从整体上解决与气球型CLT建筑物有关的研究问题将使我的研究计划与其他努力区分开来，这些计划倾向于集中于这些问题的各个子集。拟议的计划将探索和推动目前旨在关注可持续性和创新木材建设的计划的时刻，利用我小组中的成功研究计划，并在全国和全球范围内塑造了高大的木材建设中未来的研究议程。最终，通过在这一领域领导，该计划的成功实施将对木材的结构使用产生决定性的影响，并将增加其在高个子居民和非住宅建筑中的市场份额。