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Durability and Ultimate Flexural Loading of Shear Spike Repaired, Large-Scale Timber Railroad Bridge Members.
| 题名： | Durability and Ultimate Flexural Loading of Shear Spike Repaired, Large-Scale Timber Railroad Bridge Members. |
| 作者： | gutkowksi, r. forsling, h. |
| 关键词： | load bearing tests, dynamic structural responses, bridge tests, destructive tests, load testing |
| 摘要： | The objective of this research study is to examine the long term effectiveness and durability performance of fiber reinforced polymer (FRP) strengthened full size timber bridge members and to investigate their behavior when ultimately load tested. The shear spike strengthening approach is aimed at rejuvenating horizontal shear properties by inserting fiberglass pultruded rods through areas of damage. Shear spike fiberglass rods are inserted through predrilled holes from the top of the member, perpendicular to the primary bending axis. An epoxy-resin adhesive is incorporated during the process of insertion to bond the shear spikes to the wood. The epoxy adhesive also strengthens the member by filling adjacent cracks and decay voids. In three preceding investigations, this strengthening method has been proven to restore much of the virgin member stiffness and add horizontal shear resistance in dimension lumber, medium-sized timbers and full-sized bridge timbers, respectively. For this study, eight full-size railroad bridge timber stringers were intentionally damaged by saw cuts, to mimic deterioration, after which they were strengthened through the process of shear spiking. The stringers were then durability loaded up to 25,000 cycles after which the majority of the sample population was ultimately load tested. / Supplementary Notes: Sponsored by Department of Transportation, Washington, DC. Research and Special Programs Administration. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0811；79p |
| 报告类型： | 科技报告 |
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