火灾中端板连接件的屈服线模型的研究进展

特定温度下连接件的设计一般只考虑初始刚度和塑性抗力,然而结构在高温作用下发生大变形时其延性和破坏模式就显得更为重要。本文通过对T型连接模型的分析得到大变形,包括发生破坏的部位处端板连接件的性能。基于虚功原理建立的该模型,能很容易地应用于端板连接,而且能考虑到T型连接的翼缘和螺栓同时屈服后的材料硬化。同时还包括对这两个构件相容性的分析。对常温和升温环境中T型连接试验的验证表明:提出的模型可以预测T型连接的多种性能特征。通过与有限元分析结果对比发现:该模型可以很好地反映端板连接的性能。

Development of a Yield-Line Model for Endplate Connections in Fire

Connection designs at ambient temperature generally consider only the initial stiffness and the plastic resistance, whereas ductility and failure modes are more important for connections in fire, as large deformations are generally experienced. This paper describes the development of a T-stub model to capture the behaviour of endplate connections at large deformations, including failure wherever relevant. The model is based on the virtual work principle, which allows it to be easily applied to endplate conn...