以有限元素法分析鋼骨鋼筋混凝土柱強度與行為

Abstract

摘要 本研究利用ABAQUS有限元素分析軟體，探討鋼骨鋼筋混凝土 ( Steel Reinforce Concrete，以下簡稱SRC ) 柱在軸壓力作用下試體設計參數之鋼骨形狀、鋼骨含量、箍筋間距等對於極限強度、圍束效應與剩餘強度之影響，並與實驗結果進行驗証。進一步規劃以混凝土強度與鋼骨強度作為變化參數，探討各模型間強度與行為之差異與影響。 研究結果顯示ABAQUS有限元素分析軟體可以有效進行SRC柱之模擬，並且準確預測出試體之行為與極限強度。當柱內之鋼骨含量越高且箍筋間距越小，則有助於達極限載重後強度之維持，剩餘強度之表現越好。而根據圍束效應指標，顯示出柱內混凝土含量相對較高之情況下，箍筋對於試體之圍束效果較為良好。當SRC柱使用之鋼骨與混凝土材料強度越高，則箍筋對於試體產生之圍束效應則較為不顯著。

ABSTRACT Utilizing the finite element analysis program ABAQUS, this study investigates the behavior of the steel reinforced concrete (SRC) columns under axial compression. Effect of the specimen design parameters such as structural steel shape, amount of the structural steel, and lateral tie spacing on ultimate strength, confinement and post-failure strength were studied and the analysis results were validated with experimental results. Further, this study investigates the behavior and strength of models designated with different strengths of the concrete and the structural steel. Analysis results indicated that the finite element analysis program ABAQUS can effectively simulate the modeling of the SRC columns and predicts well the behavior and the ultimate strength of the specimens. The columns with more amounts of the structural steel and small tie spacing results in a stable post-failure strength. However, for the columns with more amounts of the concrete, the lateral ties lead to better confinement as indicated by the confinement index. For the SRC columns with high strength of the concrete and the structural steel, the lateral ties have insignificant confinement effect.