This paper presents a comparative study between Timber–Concrete Composite (TCC) systems with glued-in steel plates and screwed connections. The research focuses on evaluating the structural performance of these connections, with a particular focus on the innovative glued-in steel plate through full-scale four-point bending tests on floor subassemblies with a 7.5 m span, complemented by push-out tests for assessing the behaviour of the slab-beam connection. The study aims to determine if the glued-in steel plate, a more economical option, can replace screws without significantly compromising the TCC system’s stiffness or strength. The findings reveal that while the glued-in steel plate connections exhibited lower stiffness and ductility compared to screwed connections, they demonstrated a significantly higher load-bearing capacity. Specifically, the glued-in connections achieved capacities ranging from 670-720 kN, markedly exceeding the 300-350 kN and 480-520 kN capacities of specimens with fewer and more screws, respectively. These results suggest that glued-in steel plate connections can effectively replace screws in TCC systems, offering a cost-effective alternative without significantly reducing structural integrity. Moreover, the paper evaluates how to design TCC floors by estimating the effective number of connectors and the effective length of the glued-in steel plate using an iterative γ-method. This is done to account for changes in stiffness, as determined from push-out tests and observed in bending tests. The iterative γ-method’s findings have been validated against the predictions of a Finite Element model.

中文翻译：

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木材-混凝土复合材料系统中的胶合钢板和螺钉连接：机械性能和设计含义


本文对采用胶合钢板和螺钉连接的木材-混凝土复合材料（TCC）系统进行了比较研究。该研究的重点是评估这些连接的结构性能，特别关注创新的胶合钢板，通过对跨度为 7.5 m 的楼板组件进行全尺寸四点弯曲测试，并辅以用于评估的推出测试板梁连接的行为。该研究旨在确定胶合钢板（一种更经济的选择）是否可以替代螺钉，而不会显着影响 TCC 系统的刚度或强度。研究结果表明，虽然与螺钉连接相比，胶合钢板连接的刚度和延展性较低，但它们的承载能力明显更高。具体来说，胶粘连接的承载能力范围为 670-720 kN，明显超过了具有较少和较多螺钉的样本的 300-350 kN 和 480-520 kN 的承载能力。这些结果表明，胶合钢板连接可以有效地取代 TCC 系统中的螺钉，提供一种经济高效的替代方案，而不会显着降低结构完整性。此外，本文还通过使用迭代γ法估计连接件的有效数量和胶合钢板的有效长度来评估如何设计TCC地板。这样做是为了考虑刚度的变化，如通过推出测试确定并在弯曲测试中观察到的。迭代 γ 方法的结果已根据有限元模型的预测得到验证。