| 種別 | paper |
| 主題 | CRACK PROPAGATION ANALYSIS BY FEM AND BEM USING THE TENSILE SOFTENING MODEL |
| 副題 | |
| 筆頭著者 | Ali Hassan Chahrour（Kumamoto University） |
| 連名者1 | Masayasu Ohtsu（Kumamoto University） |
| 連名者2 | Taichi NAKAMURA（Kumamoto University） |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 12 |
| 号 | 2 |
| 先頭ページ | 865 |
| 末尾ページ | 870 |
| 年度 | 1990 |
| 要旨 | INTRODUCTION Due to the fact that classical engineering design criteria are inadequate to yield fracture prevention measures, fracture mechanics is increasingly gaining importance in the study on the failure of concrete structures. The analysis of crack propagation (initiation and control), in particular、attracts attention due to its critical role for the safety of concrete structures. The propagation of cracks is related to the fracture toughness of concrete which has to do with the softening, i.e, the existence of a descending branch in the stress-deformation diagram. This concept is utilized in this paper which aims at analyzing crack propagation in four-point bending tests of center-notched beams using the tensile softening model. The softening of concrete is due to the damage within the fracture process zone which grows with crack propagation. In a tension test, the energy absorption of concrete is mainly associated with the tensile softening curve. Here, FEM and BEM are employed in the analysis of the Load-CMOD (crack mouth opening displacement) variation as the crack propagates along the center-line of the beam. CONCLUSION This research was aimed at predicting the behavior of concrete beams under crack propagation up to the maximum (peak) load assuming linear σ-ω softening curve and linear elasticσ-ε curve. Determination of the peak load is not the goal of this paper. The next step in this research, is to combine both the tensile softening model and LEFM (Linear Elastic Fracture Mechanics) in an attempt at analyzing the nonlinear behavior of concrete. This nonlinearity effect is very important in trying to understand the crack propagation mechanism of concrete. |
| PDFファイル名 | 012-01-2146.pdf |