原文传递
Bridge Approaches and Track Stiffness.
| 题名： | Bridge Approaches and Track Stiffness. |
| 作者： | plotkin, d. davis, d. |
| 关键词： | dynamic loads, settlement(structural), ride quality |
| 摘要： | Over time, it is not uncommon for a dip in the track to develop off the end of a bridge on the bridge appreach.This dip, or bump at the end of the bridge, is often a rough-riding spot and one that requires resurfacing at more frequent intervals than does the rest of the track. A commonly held belief is that this dip in the track is caused by dynamic forces resulting from wheel loads crossing an abrupt change in stiffness between the track on the bridge and the track off the bridge. A literature search found no documented field measurements to support this belief, only two modeling studies which predicted that the effect would be negligible. Five different methods were then employed to evaluate the potential for a track stiffness change to produce dynamic loads of practical significance. These methods ranged from the most technically sophisticated to the most basic. The results from all five pointed to the same conclusionthat changes in track stiffness at a bridge end have no practical effect on either track settlement or ride quality at a bridge approach. / Supplementary Notes: Prepared in cooperation with Association of American Railroads, Pueblo, CO. Transportation Technology Center, Inc. / 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： | u0815；45p |
| 报告类型： | 科技报告 |
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