A round robin study on modelling the fire resistance of a loaded steel beam

A round robin study on modelling the fire resistance of a loaded steel beam

This paper details a round robin study of the calculated response of structures in fire. In this instance, the study is based on one of two fire tests which were conducted on steel beams in a horizontal fire resistance furnace. The two specimens in the tests were identical having come from the same cast flow. The tests were conducted according to EN 1365-3 and the steel beams had a total length 5.4 m, spanning 5.2 m. These tests also formed a part of a testing round robin, reported elsewhere. The calculations were conducted by round robin participants in two stages. In the first instance a prediction of the response was made without knowledge of the measured temperatures of the steel beam and with only the grade of steel and details of the test setup. In the second instance the participants were also given the measured elastic limit of the steel, which differed significantly from the elastic limit implied by the grade, as well as measured temperatures from the steel beam and the plate thermometers from the furnace and asked to refine their model. Statistical analysis of the round robin results are presented to illustrate the variation which arises in the results of calculations. The results of the round robin study serve to illustrate the fire research and testing community's capability for modelling this simple case as well as the uncertainty in the calculation results. The results of the calculation round robin are also compared with the testing round robin to illustrate the comparative certainty between testing and calculations.

本文详细介绍了一项关于结构在火灾中计算响应的循环研究。在此例中，该研究基于在水平耐火炉中对钢梁进行的两次火灾试验中的一次。试验中的两个试件完全相同，来自同一铸流。试验是根据EN 1365 - 3进行的，钢梁总长度为5.4米，跨度为5.2米。这些试验也是在其他地方报道的一次测试循环的一部分。 计算由循环研究的参与者分两个阶段进行。首先，在不了解钢梁测量温度的情况下，仅根据钢材等级和试验装置的详细信息对响应进行预测。其次，参与者还获得了钢材的实测弹性极限（该极限与等级所隐含的弹性极限有显著差异）以及钢梁的测量温度和来自炉子的平板温度计的数据，并被要求完善他们的模型。 对循环研究结果进行了统计分析，以说明计算结果中出现的差异。循环研究的结果用于说明火灾研究和测试团体对这种简单情况进行建模的能力以及计算结果的不确定性。还将计算循环的结果与测试循环的结果进行了比较，以说明测试和计算之间的相对确定性。