Innovative nail laminated timber-concrete composite floor deck system

创新的钉层压木-混凝土复合楼承板系统

• 批准号: RGPIN-2016-05104
• 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: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=615499
• 关键词: Innovative; nail; laminated; timber; concrete

A substantial amount of research has been conducted over the past 10 years on the development of composite timber floor systems consisting of a concrete slab and timber beams that are connected using shear connectors. A slightly different version of this type of composite systems is to use a cross laminated timber (CLT) or structural composite lumber (SCL) deck inserted between the beams and concrete slab. This modified concept originated from the profiled steel-concrete slab composite system which is widely used in long-span floor construction. The wood deck serves as formwork for the concrete slab and reduces the thickness of the concrete slab. The economics of such a 2-layer deck system is prohibitive due to the relatively high cost of CLT and SCL. In this research a more cost-effective 2-layer deck system consisting of a profiled nail laminated timber (NLT) panel and a reinforced concrete slab will be developed. The profiled NLT panel is fabricated by nailing 2 by 3 (38mm x 63mm) lumber with deeper lumber. Structurally, the profiled NLT can provide a shear key to enhance composite action with the concrete slab, especially in the transverse direction. From the production perspective, this deck system can be produced using simple tools, such as nail guns and clamps, and an under-utilized resource of 2x3 lumber. The first phase of the research will develop the most optimum product format and construction details. The basic components of lumber and concrete will consist of relatively low-grade materials. Two PhD students will work on this product development phase in the first 3 years. At the end of year 3, it is expected that the following parameters will be resolved: 1. Suitable nailing patterns for the NLT; 2. Optimum NLT profile geometry consisting of alternating 2x3 and deeper lumber; 3. Suitable mechanical shear connectors between concrete and profile NLT using light fasteners; 4. Suitable details for connecting adjacent decking panels; 5. Maximum floor span potential. In the second phase, which will be conducted in years 4 and 5, two issues will be investigated. The first one will be the connection details between the 2-layer deck system and the supporting timber or steel beams. Focus will be on the use of heavy duty fasteners, such as steel dowels. The second issue to be investigated will be the vibrational performance of the 2-layer deck system on its own and that of the complete floor system consisting the 2-layer deck and supporting beams. It is important to study vibrational performance because it is well known that for long-span floor systems, vibration serviceability likely governs the structural design. This phase will be conducted by 2 MSc students. If the results from this project show potential commercial viability for the deck system, a more comprehensive project, which will develop more refined fabrication procedure and examine other performance issues such as fire and acoustics, will be pursued.

在过去的10年中，已经进行了大量研究，该研究对复合木地板系统的开发进行了大量研究，该复合木地板系统由使用剪切连接器连接的混凝土板和木梁组成。这种类型的复合系统的一个略有不同的版本是使用横梁和混凝土板之间插入的交叉层压木材（CLT）或结构复合木材（SCL）甲板。这个修改后的概念源自介绍的钢结构板复合系统，该系统广泛用于长跨底层构造中。木甲板是混凝土板的模板，并减少了混凝土板的厚度。由于CLT和SCL的成本相对较高，因此这种2层甲板系统的经济性非常高。 在这项研究中，将开发一个更具成本效益的2层甲板系统，该系统将开发由指甲层压板（NLT）面板和钢筋混凝土板组成。介绍的NLT面板是通过钉2 x（38mm x 63mm）木材和更深木材来制造的。从结构上讲，剖面的NLT可以提供剪切键，以增强混凝土板的复合作用，尤其是在横向方向上。 从生产的角度来看，可以使用简单工具（例如指甲枪和夹具）以及未充分利用的2x3木材来生产该甲板系统。研究的第一阶段将开发最佳的产品格式和施工细节。木材和混凝土的基本成分将由相对较低的材料组成。两名博士生将在最初的三年中在此产品开发阶段工作。在第3年底，预计将解决以下参数：1。适合NLT的钉子模式； 2。最佳的NLT轮廓几何形状，包括交替的2x3和更深的木材； 3。使用光紧固件在混凝土和配置型NLT之间的合适的机械剪切连接器； 4。适合连接相邻甲板面板的细节； 5。最大的地板跨度潜力。 在第二阶段将在4年级和5年级进行，将研究两个问题。第一个将是2层甲板系统与支撑木或钢梁之间的连接细节。重点将放在使用重型紧固件（例如钢销钉）上。要研究的第二个问题将是2层甲板系统的振动性能，以及组成2层甲板和支撑梁的完整地板系统的振动性能。研究振动性能很重要，因为众所周知，对于长跨度的地板系统，振动可维护性可能控制结构设计。此阶段将由2名MSC学生进行。如果该项目的结果显示了甲板系统的潜在商业生存能力，则将追求一个更全面的项目，该项目将制定更精致的制造程序并检查其他绩效问题，例如火灾和声​​学。