為了研究火害後耐火鋼與普通鋼梁柱接頭十字銲接區在受到反覆載重作用下之力學行為，本論文利用三維非線性有限元素分析軟體建立由梁柱接頭十字銲接區簡化之十字試體數值模型進行拉壓反覆載重實驗之數值模擬，並導入火害前後耐火等級與普通等級之鋼材與銲材於反覆載重作用下之材料應變硬化參數來模擬三種鋼材配置(全普通鋼十字試體、全耐火鋼十字試體、部分耐火鋼十字試體)與五種溫度處理(未受火害、加熱至800℃持溫一小時後空氣冷卻、加熱至900℃持溫一小時後空氣冷卻、加熱至800℃持溫一小時後水中冷卻、加熱至900℃持溫一小時後水中冷卻)所組合之十五組梁柱銲接接頭十字試體的反覆載重實驗結果，並將數值模擬結果與實際實驗結果相比對，以進行相關之探討，本研究發現：十字試體反覆載重數值模擬皆較實際實驗提前破壞，所能承受之最大拉力值比實際實驗值低10%至15%，顯示數值模擬之結果較為保守。

This study used a 3D nonlinear finite-element software to develop simplified numerical models of the cross-shaped weld zones of beam-to-column welded joints, and to performed numerical simulations of the simplified cross-shaped weld zone numerical models for investigating the post-fire mechanical behaviors of the cross-shaped weld zones of fire-resistant and normal structural steel beam-column joints under tensile-compressive cyclic loadings. In addition, the strain hardening parameters of the fire-resistant grade and normal grade steel materials and weld metals under cyclic loading before and after fire were incorporated into the numerical models to simulate the cyclic loading test results of the fifteen simplified cross-shaped specimens. The fifteen specimens were composed of three types of steel allocations (i.e., fully normal structural steel allocation, partially fire-resistant steel allocation and fully fire-resistant steel allocation) and five temperature treatments (i.e., room-temperature treatment, air-cooling after reaching 800ºC for 1 hour, water-cooling after reaching 800ºC for 1 hour, air-cooling after reaching 900ºC for 1 hour, and water-cooling after reaching 900ºC for 1 hour). The numerical simulation results were compared with the realistic test results for the related investigations. This study found that compared with the test results, the numerical results damaged earlier and their maximum tensile forces were 10% to 15% lower. Therefore, the numerical results were more conservative.

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