Abstract The use of rounded dovetail connections has gained popularity in timber floor and ceiling structures due to the advance in computerized numeric control machinery. However, European building regulations for fire safety in timber structures from Eurocode 5 standard does not provide a specific method to calculate the fire performance of this kind of connections. In this work, two experimental fire tests were made to evaluate the fire performance and load-bearing capacity of this timber connection. A numerical coupled thermo-mechanical simulation of the tests was developed using the general advanced calculation methods proposed in annex B of Eurocode 5. The experimental tests showed that this connection is not able to accomplish with a R30 fire resistance class, which is the minimum requirement for lightweight timber frame assemblies. A loss of material caused by charring under the tenon of the connection leads to the failure. The general methods proposed in annex B of Eurocode 5 does not take into account the heating inside the connection. However, the simulation results showed an underestimation of the charring rate in the connection. A new simulation considering the thermal flux inside the connection was developed and it shown good agreement with the experimental tests.

中文翻译：

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火灾条件下圆形燕尾榫连接件 (RDC) 的实验和数值分析

摘要 由于计算机数控机械的进步，圆形燕尾榫连接在木地板和天花板结构中的使用越来越受欢迎。但是，欧洲规范 5 标准中木结构防火安全的欧洲建筑法规没有提供计算此类连接防火性能的具体方法。在这项工作中，进行了两次试验性防火测试，以评估这种木材连接的防火性能和承载能力。使用欧洲规范 5 附录 B 中提出的通用高级计算方法开发了测试的数值耦合热机械模拟。 实验测试表明，这种连接无法实现 R30 耐火等级，这是最低要求用于轻型木框架组件。连接榫头下炭化造成的材料损失会导致故障。欧洲规范 5 的附录 B 中提出的一般方法没有考虑连接内部的加热。然而，模拟结果表明连接中的炭化率被低估了。开发了一种考虑连接内部热通量的新模拟，它与实验测试显示出良好的一致性。