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Seismic Retrofit of Bridge Steel Truss Piers Using a Controlled Rocking Approach.
| 题名： | Seismic Retrofit of Bridge Steel Truss Piers Using a Controlled Rocking Approach. |
| 关键词： | *Bridge-piers; *Retrofitting-; *Seismic-design.;Energy-dissipation; Literature-review; Bridges-Structures; Design-; Earthquake-engineering. |
| 摘要： | The research discussed in this report was performed within Project 094, Task C-3.3, 'Steel Substructures.' It investigates a seismic retrofit technique for steel truss bridge piers that allows pier rocking by using passive energy dissipation devices implemented at the anchorage locations to control the rocking response. Specially detailed hysteretic energy dissipating elements (buckling-restrained braces) are used to act as easily replaceable, ductile structural 'fuses.' The dynamic characteristics of the controlled rocking/energy dissipation system are investigated in order to formulate a capacity design procedure using simplified methods of analysis. Design constraints are established that attempt to satisfy performance objectives and nonlinear time history analyses are used to assess the seismic behavior of the bridge piers retrofitted per this strategy. The retrofit strategy is shown to be more applicable to slender piers. The methods of predicting key response values were found to be conservative in most cases and capacity protection of the existing pier (to the prescribed limits) was achieved in all cases considered. |
| 报告类型： | 科技报告 |
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