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Safety Factor Increase to Fatigue Limit States through Shear Spiking for Timber Railroad Bridge Rehabilitation - Phase 1
| 题名： | Safety Factor Increase to Fatigue Limit States through Shear Spiking for Timber Railroad Bridge Rehabilitation - Phase 1 |
| 作者： | Dao, T. |
| 关键词： | Railroad bridges##Bridges##Safety factors##Fatigue limits##Shear spiking##Fatique tests## |
| 摘要： | The overall project is to demonstrate the effectiveness of shear spiking (technique already developed through a previous project). Many timber railroad bridges are deficient but it is too costly to replace them; hence, inexpensive repair techniques are needed. The proposed project will provide the necessary documentation of the effectiveness of this newly developed mitigation technique under realistic loads using new equipment available from a National Science Foundation grant to Colorado State University. This will ultimately be accomplished through a series of spatio-temporal fatigue tests on stringers for both non-repaired and repaired. The timing and locations of the loading will be determined from influence line analysis of a typical freight train(s). The results will be used as leverage and/or proof-of-concept to approach the American Railway Association for additional funding. This report presents the intermediate results of the project, which is designated herein as Phase I. Phase I focused on development of the actuator control algorithm, which was successfully tested in the Colorado State University Structural Engineering Laboratory in the spatio-temporal test frame using seven actuators simultaneously in force control. |
| 总页数： | 18 |
| 报告类型： | 科技报告 |
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