| 種別 | Paper |
| 主題 | NON-LINEAR ANALYSIS AND BOND MODELLING OF RC BEAMS SUBJECTED TO IMPULSIVE LOADS |
| 副題 | |
| 筆頭著者 | Ayaho MIYAMOTO |
| 連名者1 | Michael KING |
| 連名者2 | |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 10 |
| 号 | 3 |
| 先頭ページ | 727 |
| 末尾ページ | 732 |
| 年度 | 1988 |
| 要旨 | 1. INTRODUCTION The use of concrete in nuclear reactors, marine structures and other large structures are getting quite common nowadays. When considering such structures which are exposed to very severe conditions, the effects of impacts has to be taken into account. At present, the characteristics of impact forces as well as the behaviour of structures prior to failure have yet to be made clear. In this study, a dynamic non-linear finite element analytical approach was used to study the behaviour of RC beams subjected to impulsive loads up to failure. It was found that a proper bond model is necessary to study the mechanical behaviour of structures in the elastoplastic region. The main purpose of this study is to modelize bond characteristics between concrete and reinforcement, especially under impulsive loads, in order to obtain a more accurate method of analysis. The linkage element (bond-link element) developed by Ngo and Scordelis was employed in the analysis. 5. CONCLUSIONS This study was aimed at providing a bond model between concrete and reinforcement for structures under impulsive loading. The bond model was applied into a dynamic non-linear finite element analysis with the intention of application towards a new design concept for structures withstanding impulsive forces. With loading rate and bar type as variables, a series of tests were carried out and then analysis on RC beams were carried out to determine the validity of the model obtained. The conclusions derived from this study can be summarized as follows: (1)Under impulsive loading, the initial curve gradient is smaller than that of static loading but bond failure occurs at a value larger than that of static loading. (2)The spring stiffness in the direction of bar axis can be expressed as a function of bar circumference and average impulsive load duration. (3)When considering impulsive action, the necessity to consider a reasonable bond model arises only after exceeding the elastic range. |
| PDFファイル名 | 010-01-2129.pdf |