Resistance of a Portal Frame Bridge Pier Under Earthquake Waves from Arbitrary Directions

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 deg from the transverse direction of the bridge axis) and the out-of-plane directions (30 deg, 60 deg, 75 deg and 90 deg). 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.


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  • Accession Number: 01002464
  • Record Type: Publication
  • ISBN: 0309093813
  • Files: TRIS, TRB
  • Created Date: Jul 25 2005 3:40PM