Elevated Temperature Performance of Shear Connectors for Composite Beams

本研究的目的是开发实验数据、分析模型和设计模型，以代表建筑物中严重火灾的高温下复合剪切连接器的性能。组合梁在钢结构建筑的防火性能中起着关键作用，而组合剪力连接件在组合梁的防火性能中起着关键作用。预测复合梁在高温下的性能需要了解剪切连接件的能力和高温下的荷载-滑移响应。然而，几乎没有关于剪切连接件的高温行为的数据，特别是对于成形金属板的重要情况，这是迄今为止在美国钢结构建筑实践中遇到的最常见的情况。本研究将包括复合剪切连接件的高温响应的实验和计算研究。该项目的重点将是对嵌入混凝土板中的剪切连接件进行一系列广泛的仪器和精心控制的实验。试验将在20摄氏度至1000摄氏度的温度范围内进行，试验将通过计算模拟和开发剪切连接件响应的分析和设计模型来补充。这项研究将填补目前关于暴露在火灾中的结构建筑构件性能的知识库中的一个重要空白，并将有助于实现美国建筑结构的基于性能的工程防火，最终目标是提供更安全和更具成本效益的建筑。该项目还将有助于对结构工程专业的学生和消防员进行结构消防安全方面的培训。

The objective of this research is to develop experimental data, analytical models, and design models for the performance of composite shear connectors at elevated temperatures representative of severe fires in buildings. Composite beams play a key role in the performance of steel buildings in fire, and composite shear connectors, in turn, play a critical role in the performance of composite beams. The ability to predict composite beam performance at elevated temperature requires knowledge of shear connector capacity and load-slip response at elevated temperature. There is, however, virtually no data on the elevated temperature behavior of shear connectors, particularly for the important case of formed metal deck slabs, which is the by far the most common case encountered in steel building construction practice in the US. This research will include both experimental and computational studies on the elevated temperature response of composite shear connectors. The focus of the project will be an extensive series of well-instrumented and carefully controlled experiments on shear connectors embedded within concrete slabs. Tests will be conducted at temperatures ranging from 20 deg. to 1000 deg C. The experiments will be supplemented by computational simulations and by the development of analytical and design models for shear connector response.This research will fill an important gap in the current knowledge base on the performance of structural building components exposed to fire and will contribute towards enabling performance-based engineered fire protection of building structures in the US, with an ultimate goal of providing safer and more cost-effective buildings. This project will also contribute towards training of structural engineering students and of fire fighters on structural fire safety.