含潛變效應鋼筋混凝土柱的向量式有限元素分析

Analysis of Reinforced Concrete Column with Creep Effect Using Vector Form Intrinsic Finite Element Method

莊清鏘(Ching-Chiang Chuang) ； 吳俊霖(Chiun-Lin Wu)

《先進工程學刊》 14卷2期 (2019/10) Pp. 55-62

摘要

鋼筋混凝土柱是鋼筋和混凝土兩種材料組成的構件，受載時會有彈性、收縮和潛變變形，力學反應比純混凝土柱複雜，原因是鋼筋限制混凝土收縮、潛變，隨著時間推移，鋼筋和混凝土產生內力重分配，此時混凝土受力降低，鋼筋受力增加，設計若忽略這些性質會錯估柱的變形和鋼筋、混凝土應力，與實際情況不符，所以鋼筋混凝土柱的設計應考量混凝土收縮、潛變影響。本研究將鋼筋混凝土柱簡化成受壓軸力構件，並用向量式有限元素法配合齡期調整有效模量法進行模擬，同時與齡期調整有效模量法推得的解析解比較，說明向量式有限元素法模擬鋼筋混凝土柱潛變反應的可信性和可行性。

關鍵字

向量式有限元素法 ； 潛變 ； 齡期調整有效模量法 ； 鋼筋混凝土柱

並列摘要

Reinforced concrete columns are made of deformed steel reinforcing bars and concrete, which demonstrate elastic, shrinkage, and creep deformation under loading. Its mechanical behavior is more complicated than pure concrete because deformed rebars will limit the shrinkage and creep deformation in concrete. Stress redistribution takes place in steel rebars and concrete, which makes concrete stress become lower and steel rebar stress higher with time. As such, shrinkage and creep effect in concrete should be taken into account properly during design stage. This study simplifies reinforced concrete column as an axial compressive component and employs Vector Form Intrinsic Finite Element Method to carry out numerical simulation incorporating age-adjusted effective modulus method. The numerical results are then compared with analytical solutions that also consider age-adjusted effective modulus method to demonstrate the accuracy and applicability of Vector Form Intrinsic Finite Element Method in simulating creep effect in reinforced concrete column.

並列關鍵字

vector form intrinsic finite element method ； creep ； age-adjusted effective modulus method ； reinforced concrete column