| Title |
Theoretical Analysis for Strain Estimation for Strengthened RC Beams with High-Strength Bars |
| Authors |
Park Min-Suk ; Shin Kyung-Jae |
| Keywords |
High-strength Bars ; Pre-stress ; Geometry of Bars ; Strain Estimation |
| Abstract |
There are several methods for strengthened the reinforced concrete beam by using such as a steel plate, carbon fiber plate, tendon and steel bar. An advantage of strengthening by high-strength bars is that the procedure of strengthening construction is simple. The construction for strengthening RC beams with high-strength bars could be done while the building is being used. And the effect of reinforcing is excellent comparing to other strengthening methods. This is an analytical study for strain estimation for strengthened RC beams using high-strength bars. When the strengthened RC beam reaches the yield load globally, rebars embeded in concrete reach the yield strain, but external high-strength bars may not reach the yield strain. In general, the strain value of the externally reinforced bar is less than that of the internally reinforced bar. And the yield strain of high-strength bar is more than that of rebars embeded in concrete. This phenomenon must be considered in the design equation. If the external bar is yielded, the design equation becomes much simpler. If the pre-stress value is high, the external bar could be yielded by adding the stress due to the added load. The purpose of this study is to provide the basic data of the design equation considering the geometry of bars and value of pre-stress. |