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Application of Shape Memory Alloys in Seismic Rehabilitation of Bridges (August 2005). Highway IDEA Program. Final rept.
| 题名： | Application of Shape Memory Alloys in Seismic Rehabilitation of Bridges (August 2005). Highway IDEA Program. Final rept. |
| 作者： | DESROCHES, R. |
| 关键词： | *Bridge-maintenance; *Shape-memory-alloys; *Seismic-event.;Damping-; Mechanical-properties; Alloys-; Steels-; Superelasticity-; Cost-effectiveness; Highway-bridges; Performance-evaluation; Restraints-; Fabrication-; Girders-; Reinforced-concrete. |
| 摘要： | This project focused on the application of shape memory alloy (SMA) restrainers to improve the resistance of highway bridges to seismic damage. Work in the initial stage involved developing cost effective and mechanically stable SMAs for bridge rehabilitation that include ternary alloys of Ni and Ti doped with Fe or Cr. The results show that the binary form of SMAs (NiTi) exhibited superior performance as compared with the ternary NiTiCr or NiTiFe alloys. Work was performed on optimizing the performance of SMAs via thermo-mechanical processing. The effect of temperature on the superelastic cyclic properties of selected alloys was also evaluated in order to establish the temperature range for optimum performance. Work in the final stage involved fabricating and testing SMA-based prototype restrainers for use on bridges in dynamic laboratory and shake table tests. The SMA restrainers were found to be superior to steel restrainers in limiting relative hinge displacements, with maximum hinge displacement being about half of steel restrainers. They also show minimal residual strain after repeated cycling and, unlike steel, could undergo many loading cycles with little degradation of properties. With equivalent restrainers under identical earthquake motion, the SMA restrainers produced lower block acceleration as compared to steel restrainers and reached only their yield level while the steel restrainers failed. Full-scale tests on bridges are needed to demonstrate the applicability of the technology in the field. |
| 报告类型： | 科技报告 |
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