This paper explores the effectiveness and applicability of a newly developed thermo-mechanical coupled damage model for use in structural fire engineering. The damage-affected structural response of frame systems is accurately reproduced in this paper, which demonstrates the capability of the coupled damage model in giving a realistic representation of steel deterioration behaviour under combined actions of fire and mechanical loads. The coupled damage model is then used to assess the performance of a three-dimensional low-rise five-storey building and mid-rise ten-storey building with office occupancy under fire. Results provide a check of the office buildings for satisfying robustness requirements and give insight into the reasons that cause structural collapse. Compared to the conventional numerical approach, the consideration of coupled thermo-mechanical damage accumulation results in a substantial decrease in the time to collapse. A key finding from this study is that estimation of ultimate failure time by incorporating the coupled damage model with the recommended damage parameter sets has the potential to be utilized as a useful tool in helping designers to determine how much time is realistically available for evacuation before progressive collapse occurs in these types of buildings.

本文探讨了一种新开发的用于结构消防工程的热力耦合损伤模型的有效性和适用性。在本文中精确地再现了框架系统受损伤影响的结构响应，这表明了耦合损伤模型能够真实地表示火灾和机械载荷作用下的钢劣化行为。然后，使用耦合损伤模型评估三层低层五层建筑物和中层十层建筑物在办公室着火时的性能。结果可检查办公大楼是否满足坚固性要求，并深入了解导致结构倒塌的原因。与传统的数值方法相比，考虑到热机械损伤的累积，会导致坍塌时间大大减少。这项研究的关键发现是，通过将耦合损伤模型与建议的损伤参数集结合在一起，可以估计最终的失效时间，这有可能被用作帮助设计人员确定在逐步进行前实际疏散多少时间的有用工具。这些类型的建筑物倒塌。