Elevated Temperature Performance of Shear Connectors for Composite Beams

本研究的目的是为代表建筑物严重火灾的高温下复合剪切连接件的性能开发实验数据、分析模型和设计模型。组合梁对钢结构建筑的火灾性能起着至关重要的作用，而组合剪力连接件又对组合梁的性能起着至关重要的作用。要预测组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，几乎没有关于剪力连接件的高温行为的数据，特别是成形金属桥面板的重要情况，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。这项研究将包括对复合材料剪力连接件高温响应的实验和计算研究。该项目的重点将是一系列广泛的、仪器齐全和精心控制的试验，试验对象是嵌在混凝土板中的剪切连接件。测试将在20摄氏度的温度范围内进行。这项研究将填补当前建筑结构部件受火性能知识库中的一个重要空白，并将有助于实现美国建筑结构基于性能的工程化防火，最终目标是提供更安全、更具成本效益的建筑。该项目还将有助于对结构工程专业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.