Abstract The fire-induced collapse of steel structures is very likely to cause secondary casualties in fire rescue. In order to predict the structural response, as well as give early warning of the collapse location of steel truss structures in fire to the rescue team, this paper develops a safety monitoring system for steel truss structures. Firstly, the theoretical basis of the system, including the member failure index and the collapse index is derived. Secondly, a numerical example is analyzed in SAP2000 to illustrate the calculation process of the collapse index, and the results indicate that the limit value of the collapse index can be chosen as 0.45. Subsequently, the development of the system, including the theoretical framework, the design of the system, and the user interface, is described. Finally, the system is used to monitor a fire test on a steel truss roof structure. The comparison of the output and experimental results indicated that the system is able to evaluate the real-time status of the members and the global structure. Besides, the structural response predicted by the system can be given to the user 180 s ahead of time, which provides precious information for the fire brigades to determine a safer route during the rescue process.

中文翻译：

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钢桁架结构火灾安全监测系统

摘要 钢结构火灾倒塌事故在消防救援中极易造成二次人员伤亡。为预测火灾中钢桁架结构的结构响应，并为救援队提供钢桁架结构倒塌位置的预警，本文开发了一种钢桁架结构安全监测系统。首先推导了系统的理论基础，包括构件失效指标和倒塌指标。其次，通过SAP2000中的一个数值例子来说明坍塌指数的计算过程，结果表明坍塌指数的极限值可以选择为0.45。随后，描述了系统的开发，包括理论框架、系统设计和用户界面。最后，该系统用于监测钢桁架屋顶结构的防火测试。输出和实验结果的比较表明，该系统能够评估成员的实时状态和全局结构。此外，系统预测的结构响应可以提前180秒提供给用户，这为消防队在救援过程中确定更安全的路线提供了宝贵的信息。