Ambiguities in current fire design codes have triggered conflicting responses from researchers and professionals about steel buildings in fire. This is because fire codes do not consider the integrated structure of the building, but are based on the tests and models of the individual structural members of a construction subjected to a standard fire (ISO 834 or ASTM E 119). This study designed a four-story steel frame structure containing five bays with a bay span of 12 m and a height of 3.5 m according to Eurocode 3, considering all joints as being simply supported. Four different fire scenarios were modeled with reference to members of the assembled structure utilizing the Vulcan software package considering standard and parametric fire curves on exposed and protected sections. The results were compared with those obtained by exposing to the same fire curves an isolated beam member equal to those belonging to the frame under investigation. The comparison shows that the assembled members in the modeled structure had a better fire performance than did the isolated members. Because connections are important components of structures, we believe that the effects of connections on the fire performance of structures should be studied in the future.

中文翻译：

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火灾中孤立和整体结构钢构件的有限元分析

当前消防设计规范中的含糊之处引发了研究人员和专业人士对火灾中钢结构建筑的相互矛盾的反应。这是因为消防规范不考虑建筑物的整体结构，而是基于经受标准火灾（ISO 834 或 ASTM E 119）的建筑的各个结构构件的测试和模型。本研究设计了一个四层钢框架结构，包含五个跨度为 12 m、高度为 3.5 m 的跨间，根据欧洲规范 3，将所有节点视为简支。使用 Vulcan 软件包参考组装结构的成员对四种不同的火灾场景进行建模，并考虑暴露部分和受保护部分的标准和参数火灾曲线。将结果与通过将与属于所研究框架的构件相同的孤立梁构件暴露于相同的火灾曲线所获得的结果进行比较。比较表明，模型结构中的组装构件比孤立构件具有更好的防火性能。由于连接是结构的重要组成部分，我们认为未来应该研究连接对结构防火性能的影响。