抄録
The use of horizontally curved steel multi I-girder bridges is dramatically increasing for highway bridges and interchanges during the past three decades. However, dynamic behavior of these bridges is more sophisticated and less understood than that of straight bridges. In addition, this bridge type has very small torsional stiffness so it can be easy to vibrate by external dynamic loadings. By these reasons, a series of horizontally curved steel twin I-girder bridges are carried out in detail by using FEM in this study not only to learn about the free vibration characteristics but also to improve these characteristics of this bridge type. Through these analyses, several stiffening structures are recommended.
