| 種別 | Paper |
| 主題 | COMPARISON OF CREEP PREDICTION FORMULA FOR CONCRETE |
| 副題 | |
| 筆頭著者 | Tatsuya TSUBAKI |
| 連名者1 | Shoji IKEDA |
| 連名者2 | |
| 連名者3 | |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 9 |
| 号 | 2 |
| 先頭ページ | 651 |
| 末尾ページ | 656 |
| 年度 | 1987 |
| 要旨 | 1.INTRODUCTION It is considered important from a practical point of view to estimate the long-term deformation behaviour of concrete structures. Creep of concrete is one of the influence factors for the long-term behaviour of concrete structures such as deflection and cracking. Therefore, a number of prediction formulas have been developed and proposed(1,5,6,7). Each prediction formula has its own range of application, and the precision of prediction of each formula is different. For engineering purposes, it is convenient to have a method for estimating the characteristics of each prediction formula quantitatively. Comparison of various creep prediction formulas has already been done in a statistical manner by a number of reseachers(8). However, statistical comparison only gives superficial and overall characteristics, and does not necessary provide the essential properties of each prediction formula. In this study, an effort is made to find a method of comparison suitable to give a quantitative measure to estimate the characteristics of various prediction formulas. First, the creep compliance given by a prediction formula is converted into a mathmatical form based on the generalized Maxwell chain model. Then, the relaxation spectra are obtained to give a measure of comparison. The load duration and the age of concrete at loading are selected for the parameters for this purpose. 4.CONCLUSION A method to convert a creep compliance function given by a prediction formula into a generalized Maxwell chain model is tried to use to give a relaxation spectrum in order to obtain a suitable measure for comparison of various creep prediction formula. It is found that this method provides a useful information on the characteristics and the limit of application of each prediction formula the validity and the accuracy of which have already been verified by comparing with experimental data. Although comparison is made only for one particular set of material parameters in this study, the usefulness of the method is considered to be verified. It is, of course, desirable to compare the prediction formula for various sets of material parameters. In this study, the age at loading is selected as a parameter for the relaxation spectrum, however, other parameters for material properties may be selected. |
| PDFファイル名 | 009-01-2112.pdf |