| 摘要 |
A concrete box-girder with inclined tensions on the plane of a flange is provided to introduce bridge-axial tension to a desired point by adjusting bridge section and flange width to which tension is introduced, distance between tendons, an angle of the tendons, and strength of tension. In a concrete box-girder with inclined tensions on the plane of a flange, the inclined tendons include upper and lower inclined tendons(31,33), which are inclined bridge-axially(11) and horizontally(12). Inclined tension is introduced on an upper flange in an inner support part(23) on which negative moment is generated by external load. Inclined tension is introduced on a lower flange in a span center part on which positive moment is generated. The tendons are symmetrical to a bridge axis direction around the span center part and the inner support part. The bridge axis length of the tendon is greater than the half of bridge axis section requiring introduction of tension and shorter than less than a value output by adding up bridge axial intervals of the tendon. |
