考慮混凝土潛變階段施工的向量式有限元素分析

Analysis of Creep Behavior of Concrete Using Vector Form Intrinsic Finite Element Method during Construction Stage

莊清鏘(Ching-Chiang Chuang) ； 呂學治(Shueh-Chih Lu) ； 吳俊霖(Chiun-Lin Wu)

《先進工程學刊》 10卷4期 (2015/10) Pp. 213-218

摘要

潛變是混凝土重要力學特性之一，固定載荷下變形隨著時間增加，長期載荷的潛變變形可能超過彈性變形，靜不定結構會產生內力重分配影響結構長期行為，所以混凝土結構的設計與施工需考量潛變影響。至目前為止，有限元素法仍是混凝土潛變數值模擬最常用的方法，但要材料非線性迭代。不同於傳統模擬方式，本研究用向量式有限元素法模擬混凝土潛變並進行階段施工力學分析，最後以簡單算例說明向量式有限元素法模擬混凝土潛變和階段施工力學分析的可行性。

關鍵字

向量式有限元素法 ； 潛變 ； 階段施工

並列摘要

Creep is one of important mechanical characteristics of reinforced concrete; its deflection increases with time under a constant loading condition, and creep-induced long term deflection may overrun elastic deflection. Creep will induce force redistribution in statically indeterminate structures, and therefore may affect long-term structural behavior. Structural design and construction have to consider potential influence from creep. It is popular to employ finite element method (FEM) to simulate concrete creep behavior; however, this study utilized vector form intrinsic finite element (VFIFE) instead to predict creep behavior of concrete at different stages of construction. Finally, illustrative examples are provided to show how VFIFE can be applied to simulate concrete creep behavior.

並列關鍵字

vector form intrinsic finite element ； creep ； construction stages