层板钉接木-混凝土组合楼板的受力机理与设计方法研究

层板钉接木-混凝土组合楼板是由层板钉接木上覆木基结构板，并通过抗剪连接组合混凝土面层而成的重型木结构楼板体系，具有资源可再生、装配化程度高、经济高效、抗火性能好等优点。然而，对组合效应下该类楼板中关键连接力学性态和楼板受力机理等基础问题的研究不足，影响了其工程应用。本项目拟通过试验与理论分析，阐明组合楼板中钉连接和木-混凝土抗剪连接的形变模式与力学性态；通过试验与数值分析，揭示层板间钉连接和木-混凝土抗剪连接在不同设计参数下该组合楼板在平面内与平面外的受力机理、传力性能、损伤机制，提出层板和混凝土层的参数优化原则；基于增量动力分析，揭示组合楼板在整体结构中的力学行为，阐明楼板参数和力学性能对整体结构动力响应的影响机理，提出组合楼板设计方法。本项目对阐释层板钉接木-混凝土组合楼板的力学机理有重要科学意义，研究成果将为相关规范标准制定和新型木组合楼板体系工程应用提供理论支撑。

Nail-laminated timber-concrete composite floor refers to the heavy timber floor diaphragms in which nail-laminated timber is covered with wood-based structural panel, and shear keys are set to connect a layer of concrete on the top. It comes with the advantages of renewable materials, easy to assembly, cost-effective, and good fire resistance. However, the engineering application of such composite floor diaphragms are greatly hindered due to the insufficient research into the performance of the connections and load-resisting mechanism of the slabs under the composite effect between wood and concrete. This research intends to clarify the deformation mode and mechanical behavior of nailed connection and timber-concrete bonding interface in the composite floor diaphragms through experiments and theoretical analysis. Meanwhile, the in-plane and out-of-plane mechanical performance, force transferring mechanism, and failure modes of such composite floor diaphragms will be explored through experiments and numerical analysis. Moreover, the optimal allocation of the lamina and the parameters of the concrete layer will be proposed. Based on incremental dynamic analysis, the mechanical behavior of the composite floor diaphragms will be revealed in the structural level, and the design parameters and mechanical properties of the composite floor diaphragms on the dynamic response of the entire structure will be clarified. Finally, a design method will be proposed for such composite floor diaphragms. This research will make significant scientific contributions for understanding the mechanical properties of nail-laminated timber-concrete composite floor diaphragms. The research results will also provide theoretical foundation for the formulation of relevant technical standards and the application of a novel timber-concrete composite floor system.