Comparison between a Fixed Crack Criterion and a Rotating Crack Criterion

固定裂縫模型與旋轉裂縫模型之比較

莊財福(Tsai-Fu Chuang)

《明道學術論壇》 3卷1期 (2007/08) Pp. 133-161

https://doi.org/10.6953/MJ.200708.0133

摘要

本文提出一混凝土裂縫模型，用來比較固定裂縫模型(fixed crack criterion)與旋轉裂縫模型(rotating crack criterion)之差異。此二個裂縫準則是以FORTRAN電腦語言寫成，經編譯無問題後，再連結於有限元素法軟體LUSAS之主程式上。在實驗的驗證上，本文彼得森的破裂樑(Petersson's fracture beam)，來比較模型的合理性與上述裂縫準則的差異。數值分析結果顯示本裂縫模型與實驗結果相當吻合。本結果並顯示臨界角(threshold angle)，剪力折減因子(shear retention factor)，破縫能量(fracture energy)三者爲影響裂縫旋轉點的最大因子。

關鍵字

固定裂縫 ； 旋轉裂縫 ； 有限元素法

並列摘要

In this paper, a fixed and rotating crack criterion was suggested to investigate the difference between these two criterions. These two criterions have been implemented into a Finite Element program (LUSAS) to investigate the differences. A practical example (Petersson's fracture beam) was selected to validate the numerical model and investigate the differences between these two criterions. The numerical results have provided reasonable agreement with the experimental data. The numerical results also indicated that the threshold angle, shear retention factor, and fracture energy are the most important factors that affected the number of rotating crack points.

並列關鍵字

fixed crack ； rotating crack ； finite element