High performance timber connections with steel perforated plate as structural fuse

以钢穿孔板作为结构熔断器的高性能木材连接

• 批准号: RGPIN-2021-02530
• 负责人: Chui, Ying
• 金额: $ 2.26万
• 依托单位: University of Alberta
• 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=749033
• 关键词: performance; timber; connections; steel; perforated

Tall wood buildings are now technically feasible as a result of advancements made in the development of modern engineered wood products. One of the major concerns for tall wood buildings is their capacity to perform safely under seismic motions. Desirable performance attribute under seismic action is the ability of a structure to undergo large deformation, as a means to dissipate seismic energy, without collapse. For wood structures, this ability can only be accomplished if the connections in the structures contain metal components that act as a source of energy dissipation. An approach of using the so-called structural fuse to dissipate energy will be explored in this research program. This approach has been applied in steel structures, but application in wood structures will require further research. The proposed program expands on current research by the applicant to further develop a connection system that consists of a perforated steel plate connecting two or more timber members. The part connecting the steel plate to a timber member will be detailed with metal fasteners, and designed to be stronger than the perforated steel plate to ensure that the target energy dissipation would occur in the steel plate under seismic actions. The perforation pattern consists of a number of circular holes spaced at regular distance. This pattern would facilitate tuning of the perforated plate to achieve the desirable mechanical properties, such as strength, stiffness, ultimate displacement and energy dissipating capacity, and therefore the development of design specifications. As the term fuse implies, another advantage of this type of connection is that the damaged plate can be replaced with relative ease after a strong seismic event. The proposed research will be undertaken by two MSc and two PhD students. The first PhD student will investigate the influence of geometry arrangement and dimensions of perforation pattern and plate material properties on connection attributes. The first MSc project will investigate the influence of bi-directional loading on critical design properties of perforated plate. The second MSc project will study the over-strength factor that needs to be applied to the part of the connection that connects the perforated steel plate to the timber member. This part shall be over-designed to prevent fracture in wood material, but there is currently no reliable guidance on suitable over-design factor to be used. The second PhD thesis project will study the performance of the mass timber structural systems, such as shear walls, that incorporate the developed perforated plate connection. This project was motivated by discussion with design engineers who have identified the need to have economical and reliable connection systems for tall wood buildings. The success of the proposed project will allow mass timber to be considered as a viable, low carbon footprint structural material for structures, especially in seismic-active regions.

由于现代工程木产品的开发，高大的木材建筑在技术上是可行的。高大的木材建筑物的主要问题之一是它们在地震动作下安全执行的能力。地震作用下的理想性能属性是结构经历大变形的能力，作为消散地震能量而不会崩溃的一种手段。对于木结构，只有当结构中的连接包含充当能量耗散来源的金属组件时，才能实现这种能力。该研究计划将探索使用所谓的结构保险丝耗散能量的一种方法。这种方法已应用于钢结构中，但是在木结构中的应用将需要进一步研究。拟议的计划扩展了申请人的当前研究，以进一步开发一个连接系统，该连接系统由连接两个或更多木材成员的穿孔钢板组成。将钢板连接到木材构件的零件将用金属紧固件进行详细说明，并且设计比穿孔的钢板更强，以确保在地震作用下钢板中发生目标能量耗散。穿孔图案由在常规距离处间隔的许多圆形孔组成。这种模式将有助于对穿孔板的调整，以达到理想的机械性能，例如强度，刚度，最终位移和能量消散能力，从而开发了设计规格。正如保险丝一词所暗示的那样，这种类型的连接的另一个优点是，在强烈的地震事件发生后，损坏的板可以相对轻松替换。 拟议的研究将由两名MSC和两名博士生进行。第一位博士生将研究几何布置以及穿孔图案和板材材料特性对连接属性的影响。第一个MSC项目将研究双向载荷对穿孔板的临界设计特性的影响。第二个MSC项目将研究需要将穿孔钢板连接到木材构件的连接部分的超强度因子。该部分应过度设计以防止木材材料中的断裂，但是目前尚无关于适当使用的过度设计因素的可靠指导。第二个博士学位论文项目将研究结合了开发的穿孔板连接的大规模木材结构系统（例如剪切壁）的性能。该项目是由与设计工程师的讨论激励的，设计工程师已经确定需要拥有经济可靠的连接系统以用于高大的木材建筑。拟议项目的成功将使大规模木材被视为结构的可行，低碳足迹结构材料，尤其是在地震活性区域。