| Title |
Structural Behavior of High Strength Reinforced Concrete Beam-Column Joints due to Repair and Restrengthening |
| Keywords |
High Strength Concrete ; Beam-Colunn Joints ; Repair-Restrengthening ; Earthquake Type of Loading |
| Abstract |
This study focuses on the repair-restrengthening of high strength reinforced concrete building damaged by earthquake and the 2nd earthquake in order to reuse the building. The object of experiment is beam-column joints which is weaker than members in structure. At first, the object is cracked by loading weight which has the same velocity as earthquake. And then, this cracked structure is being held the primary and 2nd repair-restrengthening. With epoxy injection and carbon fiber sheet, the validity of repair-restrengthening is examined considering major variables such as loading velocity and the frequency of repair and restrengthening. To verify the validity, this study analyzes 10 specimen of beam-column joints with the structural behavior according to the hysteretic behavior, maximum stiffness, destruction, shearing transformation, energy dispersion capacity.
The results are as follows: In the specimen repaired again with high strength concrete, yield load and maximum load are lowered by 6% and 7% respectively in 2.5㎐ comparing with 1.0㎐ loading velocity. And because of the brittle property of concrete, yield load and maximum load are reduced as loading velocity is faster. To sum up, yield load and maximum load of high-strength concrete show decrease or increase of -6%～11% in comparison with the primary repair-restrengthening specimen. |