| Autor: |
Okamoto, Hiromu, Nagata, Kazutoshi, Sugiura, Kunitomo, Naganuma, Toshihiko, Watanabe, Eiichi |
| Zdroj: |
Transportation Research Record; January 2005, Vol. 11 Issue: Supplement 1 p367-374, 8p |
| Abstrakt: |
Steel portal frames are used in Japan as basic structural frames for viaducts in metropolitan areas. These structures may be subject to both near-field and far-field earthquake motions from all directions. Although for isolated single piers the earthquake-resistant design appears to be well established, the earthquake response and the resistance are not fully clarified for portal frames. A study on elastoplastic finite displacement analysis by a finite element model for earthquake resistance of steel portal frame piers of an elevated highway is presented. The incidental earthquake waves are assumed to come from arbitrary directions; for simplicity, the analysis considers five different directions covering the in-plane of the frame (0° from the transverse direction of the bridge axis) and the out-of-plane directions (30°, 60°, 75° and 90°). Some results were compared with those from experiments on portal rigid-frame bridge piers under in-plane loading conducted at Kyoto University. It was found that it is important to take the correlation of in-plane and out-of plane responses into consideration for the rational earthquake-resistant design of a portal frame bridge pier. |
| Databáze: |
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