Post Fire Assessment
Post-fire assessment follows the ISO 834 standard fire curve: damage is judged from peak fire temperature, duration and member type (column/beam/slab/wall); higher temperature and longer exposure mean worse damage, combined with 6 damage indicators.
<300°C：基本無損傷 | 300~600°C：強度下降 20~40% | 600~800°C：強度下降 50~70%
>800°C：嚴重損傷，強度喪失 70%以上；粉紅色變色約 300~600°C，灰白色約 600°C+
400°C：屈服強度下降 30% | 500°C：下降 50% | 600°C：下降 70%
屈服變形/扭曲表明溫度曾超 500°C，須重點評估
炭化深度估算：dc ≈ 0.6 × √t（t 為受火時間分鐘），炭化速率約 0.6~0.8 mm/min
剩餘截面須滿足承載力要求
根據結構型別、火災溫度、持續時間和損傷跡象，評估火災後構件損傷程度，輸出五級安全等級與處理建議。