延性节点在全过程火灾和地震中的性能

Performance of Ductile Connections Throughout the Entire Process of Fire and Earthquakes

摘要: 梁端节点是确保建筑结构在火灾工况下保持完整性的最为重要的构件。为了增强结构的韧性，本文提出了一种新型延性节点，其变形能力高于工程常用节点。本文首先介绍了这种延性节点的设计。接着使用Abaqus建立了带有延性节点的钢框架模型来研究延性节点在包括升温和降温的火灾全过程中的性能。模型中采用了包括降温阶段的ISO-834标准火灾曲线进行热力耦合分析，并使用了一个用户子程序VUSDFLD来考虑降温阶段结构钢和高强钢的材料性能。最后，在循环荷载作用下建立了带有延性节点和工程常用端板式、鳍板式连接节点的精细化钢框架模型，来研究延性节点在地震中的性能。

Abstract: Connections play a crucial role in maintaining the structural integrity of a building during a fire. To enhance the resilience of structures, this paper proposes a new ductile connection that offers higher deformation capacity compared to commonly used connections. The design of this ductile connection is presented first. Subsequently, a series of steel frame models with ductile connections are created using Abaqus to study the performance of the ductile connection throughout the entire fire process, including heating and cooling. The models adopt the ISO-834 standard fire curve, which includes the cooling phase. To account for the mechanical properties of carbon steel and high-strength steel during the cooling stage, a VUSDFLD user subroutine is developed. Finally, detailed steel frame models with ductile connections and commonly used end-plate and fin-plate connections in engineering are established under cyclic loading to study the performance of ductile connections during earthquakes.