Enhancing the design of connections for fire resiliency

火灾可能导致包括钢材在内的所有材料的许多结构损坏。为了确保钢结构建筑的弹性，梁柱连接应能够承受火灾引起的荷载。为了更好地了解这些连接在火灾下的结构行为，最终目标是确保优化的防火，可以考虑有限元分析（FEA）。高级FEA可以补充实验数据，因为全尺寸火灾测试昂贵且难以进行。当前项目将使用有限元分析软件LS-DYNA进行所有分析，因为LS-DYNA广泛用于咨询行业的商业项目。首先，将进行热传递分析，然后进行循环载荷分析。传热分析将考虑不同的火灾场景，其中LS-DYNA中的子程序将被开发为显式动态求解器。FEA将考虑钢的不同导热材料特性，以评估所检查的防火材料。有限元分析将重点对延性不同的三种不同连接（双角、单角和剪切翼片）进行建模。数值结果将评估连接的不同被动防火系统，例如，喷涂防火材料。开发的FEA模型将考虑散热，并根据火灾场景后开发的应力和变形，提出一种平衡安全性与经济性和美学规范的最佳设计。最后，将开发一个框架来连接和更新来自Revit的初始设计模型与LS-DYNA。分析结果旨在提出安全设计，考虑降低钢结构的建设成本。拟议的伙伴关系的目标是显着推进有关的知识状态的建筑物的弹性钢连接的有效设计时，暴露的热负荷，并提出了一个安全的设计方法，考虑减少这种钢结构的建设成本。

Fire can lead to many structural damages for all materials, including steel. To ensure resiliency in a steel building, beam-column connections should be able to withstand the induced loading due to fire. To better understand the structural behaviour of these connections under fire with the final objective to ensure an optimized fire protection, finite element analysis (FEA) can be considered. Advanced FEA can supplement experimental data since full scale fire tests are expensive and difficult to be conducted. The current project will use the FEA software LS-DYNA to perform all analyses, since LS-DYNA is widely used in commercial projects in the consulting industry. First, a heat transfer analysis will be done followed by the cyclic loading analysis. The heat transfer analysis will consider different fire scenarios where subroutines in LS-DYNA will be developed into the explicit dynamic solver. The FEA will consider different thermal conductivity material properties for the steel to evaluate the examined fire protective materials. The FEA will focus on modeling three different connections that will vary in ductility (double angle, single angle and shear tab). The numerical results will evaluate different passive fire protection systems of the connections, e.g., spray-applied fire-resistive materials. The developed FEA models will consider heat dissipation and, based on the developed stresses and deformations after the fire scenarios, an optimal design that balances safety with economic and aesthetic specifications will be proposed. Finally, a framework will be developed to connect and update the initial design models from Revit with LS-DYNA. The analysis results aim to propose safe design by considering the reduction of the construction cost of steel structures. The goal of the proposed partnership is to significantly advance the state of knowledge related to an effective design of resilient steel connections of buildings when exposed thermal loadings and propose a safe design approach by considering reduction of the construction cost of such steel structures.