本研究採用有限元素法用於三維鋼床鈑問題和含裂縫之三維鋼床鈑問題，並使用多尺度分析方法。因大跨度橋梁由於跨徑過長，在ABAQUS軟體建置模型時容易導致網格過密而無法分析，因此加入了多尺度分析方法，使大跨度橋樑可以分析準確，進而提升計算的準確性和便利性。而裂縫的應力強度因子計算上則使用ABAQUS軟體的迴圈積分。 首先針對鋼床鈑相關文獻及多尺度方法相關文獻進行驗證，以確保建模的可靠度。第二，在不含裂縫之鋼床鈑問題，使用多尺度分析方法時，觀察模型所需之多尺度模型數量，並根據數值比較得出最佳所需之多尺度模型數量。第三，得出所需模型數量時，採用此結果並觀察網格間距之粗細對分析結果之影響。第四，在含有裂縫之三維鋼床鈑問題加入多尺度分析方法，並採用第二點之結果，觀察網格間距之粗細對分析結果之影響。 ;The study investigated the analysis of three-dimensional steel bridge pavement that contained a transverse top-down crack and the three-dimensional steel bridge pavement, which used a multi-scale analysis method. Due to the long-span bridges, it easily caused the mesh too dense to be analyzed. Therefore, the multi-scale analysis method can make the long-span bridges accurately analyzed. The approach to calculate the stress intensity factor has been evaluated by using contour integrals. First of all, the literature relevant to the steel bridge pavement had been verified to ensure the reliability of the modeling. Secondly, using the multi-scale analysis method for steel bridge pavement, and observe the number of multi-scale models required. Thirdly, when we obtain the number of multi-scale models, use this result and observe the mesh distance that influences the analysis results. Lastly, according to the result from the second point, three-dimensional steel bridge pavement’s problem that contained a transverse top-down crack, by using a multi-scale analysis method and observe the mesh distant that influence the analysis results.
