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首页> 外文期刊>Journal of structural fire engineering >Tensile Behaviour of Galvanised Grade 8.8 Bolt Assemblies in Fire
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Tensile Behaviour of Galvanised Grade 8.8 Bolt Assemblies in Fire

机译：镀锌8.8级螺栓组件在火中的拉伸行为。

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In structural fire engineering, the importance of bolt assemblies is often overlooked. Connection design uses the temperature-dependent bolt strength-reduction factors prescribed in Eurocode 3, despite the existence of two distinct failure modes under tension; necking of the bolt shank, and thread-stripping. While literature exists to predict failure modes at ambient temperature, there is no method for failure mode prediction for elevated temperatures where ductility is critical to avoid collapse. Galvanised M20 structural bolt assemblies and bolt material from a single batch have been tested under tension at a range of temperatures and strain-rates typical of those experienced in fire. Turned-down bolt test data produced stress-strain curves characteristic of different microstructures at ambient temperature, despite a tempered-martensitic microstructure being specified in the standards. The failure modes of bolt assemblies were found to be dependent on the as-received microstructure at ambient temperature. At elevated temperatures, however, only thread-stripping was observed.
机译：在结构消防工程中，螺栓组件的重要性通常被忽略。尽管存在两种不同的拉伸失效模式，但连接设计仍使用欧洲规范3中规定的与温度相关的螺栓强度折减系数。螺栓柄缩颈，剥线。尽管已有文献预测环境温度下的失效模式，但尚无方法针对高温下的失效模式预测，因为延性对于避免崩溃至关重要。镀锌的M20结构螺栓组件和单批螺栓材料已经在拉伸过程中经受了火灾中典型的温度和应变率测试。尽管标准中指定了回火马氏体微观结构，但向下的螺栓测试数据仍可在环境温度下产生不同微观结构的应力-应变曲线。发现螺栓组件的失效模式取决于环境温度下的初始微观结构。然而，在升高的温度下，仅观察到螺纹剥落。

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