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Effectiveness of Exterior Beam Rotation Prevention Systems for Bridge Deck Construction
| 题名： | Effectiveness of Exterior Beam Rotation Prevention Systems for Bridge Deck Construction |
| 作者： | Ashiquzzaman, M.; Hui, L.; Schmeltz, J.; Merino, C.; Bozkurt, B.; Ibrahim, A.; Lindquist, W.; Hindi, R. |
| 关键词： | Beam rotation prevention systems##Bridge deck construction##Overhang width##Exterior girder rotation##Rotation prevention system##TAEG (Torsional Analysis Exterior Girders) program##Experimental study## |
| 摘要： | Bridge decks often overhang past the exterior girders in order to increase the width of the deck while limiting the required number of longitudinal girders. The overhanging portion of the deck results in unbalanced eccentric loads to the exterior girders, which are generally greatest during construction. These eccentric loads mainly come from the bridge placing and finishing equipment as well as fresh concrete and other construction live loads that can create rotation of the exterior girders in the transverse direction. The rotations can also affect both the global and local stability of the girders as well as the bridge. In this study, the current bracing systems used by the Illinois Department of Transportation (IDOT) were evaluated through field instrumentation, finite element analysis (FEA), and the use of the Torsional Analysis Exterior Girders (TAEG)) program. Alternative bracing systems were evaluated through an experimental study and FEA. Based on this work, it is recommended that intermediate cross frames with top and bottom angles in addition to cross-angle sections in the exterior panels be specified to limit exterior girder rotation during construction. An alternative approach is to place transverse ties and diagonal pipes in the exterior panels at a spacing to maintain the spacing-to-girder-depth ratio below 3.94. |
| 总页数： | 126 |
| 报告类型： | 科技报告 |
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