Abstract During the heating process of a fire test, most test specimens are in a stress-free state, while the components of the actual structures are often in a complex state of stress, particularly for pre-stressed members such as steel cables. To reflect the actual fire conditions of stainless steel cables and explore the effects of stress levels on the mechanical properties of stainless steel cables after high temperatures, this study examines the residual mechanical properties of a stainless steel cable after high temperatures. A fire test on stainless steel cables at different stress levels was conducted, and subsequently, the static tensile test at room temperature (30°C) was conducted for the specimens after firing and after natural air cooling. The elastic modulus, tensile strength, yield strength, fracture strain, and stress-strain curves of the stainless steel cables under different temperature-stress conditions were obtained. The mechanical properties of stainless steel cables after a high temperature were compared with those of carbon steel cables and other stainless steel materials. The equations to predict the mechanical properties of a stainless steel cable after a high temperature are provided, and it can provide a reference for the safety assessment and replacement of pre-stressed structures after a fire.

中文翻译：

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不锈钢电缆火灾后力学性能

摘要 在火灾试验的加热过程中，大部分试样处于无应力状态，而实际结构的构件往往处于复杂的应力状态，特别是钢索等预应力构件。为反映不锈钢电缆的实际火灾情况，探讨应力水平对不锈钢电缆高温后力学性能的影响，本研究检测了不锈钢电缆高温后的残余力学性能。对不锈钢电缆进行了不同应力水平的耐火试验，随后对烧成后和自然空冷后的试样进行了室温（30℃）静态拉伸试验。弹性模量、拉伸强度、屈服强度、断裂应变、得到了不锈钢索在不同温度-应力条件下的应力-应变曲线。将高温后不锈钢电缆的力学性能与碳钢电缆和其他不锈钢材料的力学性能进行了比较。给出了不锈钢索高温后力学性能的预测方程，可为火灾后预应力结构的安全评估和更换提供参考。