| 種別 | paper |
| 主題 | A Time-Dependent Uniaxial Constitutive Model of Concrete as Composite Structural Material |
| 副題 | |
| 筆頭著者 | Chongmin SONG （University of Tokyo） |
| 連名者1 | Kohichi MAEKAWA （University of Tokyo） |
| 連名者2 | |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 11 |
| 号 | 2 |
| 先頭ページ | 685 |
| 末尾ページ | 690 |
| 年度 | 1989 |
| 要旨 | INTRODUCTION It is well known that the seismic load on a structure subjected to an earthquake is extremely complicated because not only the seismic force but also the loading speed changes with time. In finite element method analysis of reinforced concrete structures under such loads with complex histories, it is necessary to have a constitutive model which can give the stress for arbitrary strain-time history. At present there are several models which can be used for cyclic loadings of constant loading speed or monotonic loadings of varied loading speeds separately (1)-(4),but no model suitable to seismic analysis is available. In this paper the time-dependent constitutive relation of concrete is simulated by a so-called "elasto-viscoplastic fracture model" composed of elastic-plastic-viscoplastic bar elements with different elastic,plastic and viscoplastic properties. CONCLUSION From this study it can be concluded that concrete behaves as a composite structural material during unloading and reloading,which causes the nonlinearity of unloading-reloading loops. The model proposed here based on the above concept can simulate the constitutive relation of concrete with good accuracy,but it needs simplifying in order to apply it to numerical analysis of structures. |
| PDFファイル名 | 011-01-2115.pdf |