- 學位論文
混凝土圓柱試體破壞之探討
The Study on Fracture Mechanism of Cylindrical Concrete Specimens
摘要
混凝土強度目前多採用圓柱抗壓試驗，而以圓柱試體鑽心試體進行強度抗壓試驗時，混凝土情形多為側向，導致開裂而非實際的混凝土壓潰，因此本研究以混凝土側向變形的破壞模式為基準，探討混凝土強度之機制。 本文包括分析和實驗兩部分：分析方面主要是藉由有限元素分析軟體ANSYS，以2D實體元素模擬圓柱體，以探討不同尺寸下之圓柱體達到極限應力時的破壞行為。實驗方面，規劃了五組試體進行單軸壓縮試驗，且在每支試體的側邊中央處架設測位計以便量測到側向變位。 將實驗的數據與分析的資料進行比對，可得到與CNS1238中的長徑比與強度更正因數的趨勢是類似的，為了使實驗的資料與分析所得的數據相符合，將分析所代入的參數以實驗的數據來求知而得的，所得到的結果與實驗的軸向變位接近而側向變位於分析中較為保守，未來可以利用本研究之界面模型，應用在以不同材料補強於混凝土試體以探討破壞之行為。
並列摘要
The method of test for compressive strength of cylindrical specimens has been widely used on evaluating the strength of concrete. Also, in the test for compressive strength with drilled cores of cylindrical specimens, the concrete is lateral spreading, leading to Cracks in Concrete Structures rather than actual crushing. Hence, the purpose of this study is to evaluate the framework of the strength of concrete on the basis of failure modes of concrete’s lateral transformation. The study includes two sections, which are the analysis and the experiment. The section of analysis focus on the inquiry of cylindrical specimens of different size meet the maximum to ultimate stress with the finite element software ANSYS and 2D solid elements to simulate cylindrical specimens. The experiment has five specimens for monotonical compression test so that the measurement of lateral transformation can be achieved due to LVDT in the lateral middle of each specimen. With the comparison of experiment statistics and analysis data, the similarity between CNS1238’s length to diameter ration and the tendency of corrected intensity factor can be attained. To make experimental data correspond to the analysis, the parameter of analysis can be used with the experimental data. In this case, the result of this study can be proceed the statistical analysis and evaluate the application of fracture of concrete specimens of different materials.
參考文獻
被引用紀錄
延伸閱讀
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