本研究利用三維非線性有限元素程式ABAQUS，配合「區塊溫度給定分析法」與「FDS-ABAQUS非耦合分析法」模擬一實尺寸H型鋼構架試體在高溫爐中受定載加溫的高溫火害行為，探討鋼梁構件在高溫火害時軸向受到束制的結構變形行為與破壞機制；此外，本論文亦再透過FDS動態火場模擬程式與ABAQUS有限元素程式模擬火場中有無遮蔽物對試體所造成的影響，並針對耐火鋼鋼梁在H型鋼構架試體中的高溫火害行為，探討其耐火能力，藉以提出耐火鋼用於鋼梁構件之可行性。結果顯示：H型鋼構架中的鋼梁構件在高溫火害下因受到軸向束制的影響，在火場升溫初期鋼梁會受到軸向壓力而產生P-效應，使得撓度增加，在火場升溫後期，鋼梁因勁度折減產生大變形而形成懸垂效應，變形加劇，使得鋼梁受到軸向拉力； FDS-ABAQUS非耦合分析法模擬，不論在破壞溫度、挫屈位置以及試體結構變形上，皆有不錯的結果，且可更真實的模擬試體受火害高溫之行為；此外，全梁構件皆為耐火鋼材確實能有效提升耐火性能。

This study employed finite-element program ABAQUS to simulate the structural behaviors of the constant loaded full-scale H-shaped steel frames tested at elevated temperatures by Block Temperature Assigned Method and FDS-ABAQUS Uncoupled Thermal-Stress Analysis Method, and discussed the structural deformations and failure mechanisms of the axially restrained steel beams at high temperatures. In addition, this study also simulate the effect with or without the fire barrier (i.e. the lateral bracing frame) on the specimens at elevated temperatures by using FDS and ABAQUS. The feasibility of using fire-resistant steel to improve the structural performance of steel beams at elevated temperatures was also studied. The numerical simulation results show that, at the initial stage of elevated temperatures, the deflection of the axially compressed steel beam increases due to P- effect. At the final stage of elevated temperatures, the steel beam results in large large deformation due to catenary effect. Compared to the numerical results from Block Temperature Assigned Method, FDS-ABAQUS Uncoupled Thermal-Stress Analysis can provide better results on the simulations of critical temperature, buckling location and structural deformation, and therefore can simulate more realistic structural behaviors of steel specimens at elevated temperatures. Besides, the whole beam made of fire-resistant steel can effectively improve the fire-resistant performance.

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