| 摘要 |
The present invention relates to a multi-span steel girder which comprises: a steel bottom flange; a steel top flange placed on the top of the steel bottom flange to be distanced from the steel bottom flange; a pair of steel webs for connecting the steel bottom flange and the steel top flange; multiple steel diaphragms installed in each branch unit to connect the steel bottom flange, the pair of steel webs, and the steel top flange; concrete constructed on the steel bottom flange in a negative moment section of the multi-span steel girder; a stopper placed on both ends of the concrete to connect the steel bottom flange and the pair of steel webs; and a first reinforcing plate in the shape of a strap having a certain width to be combined with a side of the steel webs and the steel diaphragms and to be attached to the top side of the concrete. The present invention has the reinforcing plate combined with a side of the steel webs and the steel diaphragms on the concrete constructed on the steel bottom flange in the negative moment section in the multi-span steel girder to allow the integrated behavior of concrete with the multi-span steel girder and a composite behavior on an interface unit even when applied with a compressive force while in use. Thus, the present invention can prevent the performance degradation in a long-term usage. |
