| 種別 | paper |
| 主題 | Localization Analysis of a Concrete Bar Subjected to Compression |
| 副題 | |
| 筆頭著者 | Guo-Xiong YU（Department of Civil Engineering） |
| 連名者1 | Tada-aki TANABE（Department of Civil Engineering） |
| 連名者2 | |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 15 |
| 号 | 2 |
| 先頭ページ | 1237 |
| 末尾ページ | 1242 |
| 年度 | 1993 |
| 要旨 | INTRODUCTION A phenomenon that frequently accompanies inelastic deformation is that large strain ac-cumulates inside a band without substantially affecting the strain in the surrounding material.This phenomenon called "localization" emerges as an outcome of the constitutive behavior of the material,and occurs in a wide variety of solids including concrete material.Once localization takes place,large strain can accumulate inside the band and lead to fracture.Being interested in this phenomenon,the authors have started to apply the theory for reinforced concrete and try to capture this phenomenon by finite element method.In this study,we present some result of investigation which is only limited to nonreinforced concrete.The method proposed by Ortiz,is used to enhance the performance of general classes of elements in the problems involving strain localization.Numerical studies of two specimens are presented with one material following J2 theory and the other following the concrete constitutive model proposed by Wu and Tanabe.Throughout the numerical calculation,the determinant of the total tangential stiffness matrix is calculated in order to determine the relation between localization bifurcation phenomenon and other kinds of bifurcation occurring when the determinant of the tangential stiffness matrix is singular. CONCLUSION By enhancing the element performance through the method proposed by Ortiz,the localization phenomenon can be captured sharply with rectangular mesh and isoparametric elements without taking explicit account of likely direction of localization.Numerical studies were carried out to capture the localization phenomenon on two different cases,one case is with a specimen obeying J2 theory and the other with a specimen obeying the concrete constitutive model proposed by Wu and Tanabe.For the concrete specimen obeying that constitutive model and subjected to uniaxial compression,localization of shear type predominates with the shear band occurring 38° with respect to the compressive load direction.For both specimens the eigen value of the total tangential stiffness matrix become negative when shear band develops through the specimen. |
| PDFファイル名 | 015-01-2209.pdf |