| Title |
Evaluation of Bursting Behavior in Anchorage Zone of PSC Ⅰ Girders |
| Keywords |
anchorage zone;bursting force;bursting reinforcement;bursting crack;spalling force;spalling reinforcement;spalling crack;PSC I girder;정착부;파열력;파열보강철근;파열균열;할렬력;할렬보강철근;할렬균열;PSC I 거더 |
| Abstract |
An experimental study to evaluate bursting behavior in anchorage zone of the standard PSC I girders (span length: 30 m) has been carried out. The arrangement of bursting reinforcement in anchorage zone of the standard PSC I girders is considered to be designed without accurately reflecting the stress flows in the end zone of the PSC I girders caused by presstressing forces of the tendons. Also, due to excessive arrangement of the bursting bars, the workability of the girder is decreased greatly. In this study, three specimens with the same dimensions as the end zone of the standard PSC I girder are prepared and the experiment is carried out by applying PS forces. The bursting reinforcement of each specimen consists of 100 ㎜, 200 ㎜, and 300㎜ spacings, respectively. The experimental results show that the range of the PS forces to cause crack in the anchorage zone of the specimen are more than 1.6 times of the design PS forces. The bursting cracks occur in the vertical direction on the inside of all specimens. After applying 2.7 times of the design PS force, some of the transverse bursting reinforcements only in the specimen reinforced by 300 ㎜ spacing yielded. The experimental results show that the anchorage zone of the standard PSC I girders arranged by 300 ㎜ spacing of the bursting reinforcements which is the maximum spacing allowed in the road bridge design specifications, can be considered safe enough. |