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A modular fish-bone girder pier consists of one main girder system named as “Spine Girder”. Therefore, this pier can be most affected by torsion as well as flexural bending. The design considerations of the fish-bone girder pier are proposed to assure the reasonable design in this study. In order to investigate the behavior characteristics, structural analysis F.E model is developed, and the verification of the developed model is performed by comparison with experimental data. From the investigation of the structural behavior, the vertical stiffener is required at the bottom of bone-beams to prevent the excessive local stress. Also, it is found that the normal stress of the flange and the shear stress of the web and flange are dominantly affected by the warping torsion and pure torsion, respectively. Key Words : Pier, Fish-bone girder, Spine girder, Bone beam, warping, torsion    (09 B-01)   . * Corresponding Author : Nam-Hyoung Lim(Chungnam National Univ.)Tel: +82-41-821-7005 email: nhrim@cnu.ac.krReceived November 28, 2013 Revised January 8, 2014 Accepted January 9, 2014

Design Consideration of Fish-bone Girder Pier using the Analysis of Torsional Behavior