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Approaches for the Seismic Retrofit of Braced Steel Bridge Piers and Proof-of-Concept Testing of an Eccentrically Braced Frame with Tubular Link. Technical rept.
| 题名： | Approaches for the Seismic Retrofit of Braced Steel Bridge Piers and Proof-of-Concept Testing of an Eccentrically Braced Frame with Tubular Link. Technical rept. |
| 作者： | BERMAN, J. W.; BRUNEAU, M. |
| 关键词： | *Seismic-design; *Earthquake-engineering; *Bridge-piers; *Retrofitting-; *Steel-bridges.;Trusses-; Eccentricity-; Frames-. |
| 摘要： | There are many steel truss bridges in the United States and other countries that were constructed at a time when seismic design was not well understood. Many of these bridges are now considered to be seismically vulnerable. Contributing significantly to their undesirable seismic performance are the braced steel piers that support the superstructure. These piers typically have bracing members that are made up of channels or angles that are tied together with steel lacings and rivets. Recent experimental investigations have shown that such structural members can suffer severe local buckling, rapid strength degradation, and limited ductility, when subjected to cyclic loading. Therefore, it is necessary to develop retrofit strategies for these piers that focus on protecting, strengthening, or increasing the ductility of the existing brace members. This report describes, categorizes, and uses selected qualitative measures to rate various retrofit strategies for steel truss bridge piers. Promising retrofit strategies which require fundamental research before they can be properly implemented are then identified. One such strategy is an eccentrically braced frame where the link is not subject to lateral torsional buckling. This is desirable since eccentrically braced frames have been shown to exhibit excellent seismic performance, and if lateral bracing of the link can be avoided, they can be easily implemented in bridge piers where lateral bracing can be difficult to provide. |
| 报告类型： | 科技报告 |
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