| 種別 | Paper |
| 主題 | IMPLEMENTATION OF BEM ANALYSIS IN MODE-I FRACTURE OF CONCRETE BEAMS |
| 副題 | |
| 筆頭著者 | Ali Hassan CHAHROUR（Graduate School of Kumamoto University） |
| 連名者1 | Masayasu OHTSU（Kumamoto University） |
| 連名者2 | Tetsuya SAKAMOTO（Tobishima Corporation） |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 13 |
| 号 | 2 |
| 先頭ページ | 1009 |
| 末尾ページ | 1014 |
| 年度 | 1991 |
| 要旨 | INTRODUCTION Cracking is an essential feature of the behavior of concrete structures. Even under service loads, some structures are full of cracks and the life of such structures are governed by continuous growth of crack-like defects. In this respect, fracture mechanics is useful for investigating the tensile failure created by crack growth under the action of tensile stresses, and determining parameters governing the failure process. Tensile strength, fracture energy and tensile-softening curve are known as the parameters which define mechanical behaviors of concrete in the fracture process zone. In the present paper, mode-I fracture of simply supported center-notch beams under four-point bending is investigated for plain concrete and steel-fiber reinforced (SFR) concrete. Here, SFR concrete with two kinds of fiber. ratios are considered to study the effect on the fracture toughness. Numerical simulation by the boundary element method (BEM) is carried out to investigate crack propagation of the beams, based on the tensile softening model and the linear elastic fracture mechanics (LEFM). In the case of LEFM, two-domain BEM analysis is also performed with the aim of extending the analysis to mixed-mode problems later on. Acoustic emission (AE) measurement is applied to experiments to determine the critical stress intensity factor of mode-I failure of concrete. Fracture behaviors obtained in the experiments of four-point bending beams are compared with analytical results to study the applicability of the BEM analysis. CONCLUDING REMARKS This research aims at investigating the application of BEM analysis to mode-I fracture of concrete, based on the fracture mechanics. It is found that both the tensile softening model and the LEFM model are applicable to simulate mode-I failure of center-notched concrete beams. |
| PDFファイル名 | 013-01-2172.pdf |