近年來，輕鋼構在國外被廣泛地應用，其特點在於質量輕、施工性佳，且被視為是耐震性能優越的建築結構系統，然而鋼材在高溫環境下材料強度會大幅減弱，因此，有必要針對其火場結構行為進行了解。本文依實際箱型輕鋼構試體來進行火害環境下高溫受熱反應，並參酌CNS 12514建築物構造部分耐火試驗法進行實驗方法之擬定，最後以有限元素數值模擬方法來分析其高溫受熱中結構變形行為，並選用ANSYS為數值模擬工具；在材料組成律方面，因試體所用之鋼材之高溫材料性質目前尚未經過測試，且國內相關資料亦不甚完備，故先以歐洲規範EUROCODE 3高溫受熱環境下之鋼材性質資料，以作為數值模擬分析依據。
本文主要敘述火災室及梁柱上各處溫度、數值模擬分析之建立與驗證以及三種不同邊界條件下箱體單元輕鋼結構高溫受熱試驗之模擬，包含變溫無載重與變溫加載試驗，主要以了解此箱體輕鋼結構在高溫中之力學特性及局部束制行為與熱膨脹所帶來之影響，以供後續研究整體此類箱體鋼輕結構高溫受熱行為之參考。

In recent years, light steel structure has been widely being used in foreign countries. Among its merits are that it is lightweight, easy to construct, and excellent seismic performance. However, when subjected to high temperature in room fires, the material strength would be substantially reduced. Therefore, it is essential to learn about its structural behaviors at a fire scene. This study has conducted structural behavior analysis on the units of Box-structured Light Steel House in an actual room fire. A room fire test on the single unit of the Box-structured Light Steel House was conducted based on CNS 12514 specifications, and FEM (Finite Element Method) numerical simulations were then used to analyze its structural deformation behaviors under the room fire environment by using ANSYS as the simulation tool. Regarding the material properties used in the simulations, as the steel properties of high-temperature of the test specimen have not been available, and that such relevant information is not fully available domestically, the European norm EUROCODE 3 of steel property under a high-temperature environment was adopted to work.

The main purpose of this study is to unveil the various temperatures within the room air and on the structural parts during a typical room fire, to establish and verify the numerical simulation analysis, and the structural behaviors of the units of Box-structured Light Steel House, subjected to different boundary constrains with/without live load. This serves as a reference for follow-up studies on the overall high-temperature behaviors of the Box-structured Light Steel House.

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