摘要
　　本文應用Convected Material Frame Approach(C.M.F. Approach)並改變分析流程中的材料組成律，使之可以針對不同的材料特性求解非彈性結構的力學行為。且建構非線性結構大變形分析之模式，進而討論鋼構架承受衝擊荷重之非線性的行為。
　　Convected Material Frame Approach是仿照傳統的顯性有限元素法並將之改良而成。它將求解的過程離散化，先針對結構物將其化成有限個元素的集合，接著取前後分析時間點的變形差，求解桿件元素(elements)上的應力應變關係，再由此關係，利用虛功原理求解結構動力平衡方程式，並輔以顯性時間積分法(explicit time integration)，以求解結構物在各歷時下的變位、速度與加速度；而在結構材料性質的處理上，由於非彈性結構之應力應變關係不再是成線性比例相關，因此桿件中因應變而產生的應力不再只是簡單地乘上一常數即可求出；相反地，兩者的關係必須代之以非線性函數來表示，同時考慮不同桿件斷面實際應力應變分佈情況加以求解之。

　　本文以ANSYS軟體驗證數值結果，結果顯示本文數值結果與ANSYS軟體所得之結果比較良好。

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