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THREE-DIMENSIONAL NONLINEAR STABILITY ANALYSIS OF TANGENT CONTINUOUS WELDED RAIL TRACK UNDER TEMPERATURE AND MECHANICAL LOADS.
| 题名： | THREE-DIMENSIONAL NONLINEAR STABILITY ANALYSIS OF TANGENT CONTINUOUS WELDED RAIL TRACK UNDER TEMPERATURE AND MECHANICAL LOADS. |
| 作者： | Bao-Y; Barenberg-EJ |
| 关键词： | THREE-DIMENSIONAL; NONLINEAR-ANALYSIS; STABILITY-ANALYSIS; TANGENT-TRACK; CONTINUOUS-WELDED-RAIL; THERMAL-LOADS; MECHANICAL-LOADS; COMPUTER-MODELS; BALLAST-; LATERAL-RESISTANCE; VEHICLE-VERTICAL-LOADS; VEHICLE-LATERAL-LOADS |
| 摘要： | Results from applications of the three-dimensional continuous welded rail (CWR) track model ILLIBUCKLE to a tangent CWR track with nonlinear resistance and lateral geometric imperfections are presented. Stability analysis is made of the tracks under temperature and mechanical loads by using temperature lateral-displacement curves. Tangent CWR track stability is highly sensitive not only to ballast lateral resistance and geometric imperfections of the initial track but also to the vertical rotational stiffness in rail-pad fastener systems and vehicle lateral loads. It is concluded that not only the peak values but also the initial slope and the limit resistance in the ballast lateral-resistance curve obtained from a single-tie push test are important in evaluation of track stability. With regard to vertical rotational stiffness in a rail-pad fastener system, track stability is not significantly affected by the nonlinearities, but it is affected by the initial slope. Effects of the combination of mechanical and thermal loads on tangent track stability are presented. The reduction of ballast lateral resistance due to the uplift of rail tie under vehicle vertical loads as well as the magnitude of vehicle lateral loads significantly decrease track stability. A 1400-kg vehicle lateral load can buckle tangent CWR track under a rail-temperature increase as low as 56 deg C (100 deg F) under unfavorable conditions. |
| 总页数： | Transportation Research Record. 1997. (1584) pp31-40 (12 Fig., 1 Tab., 19 Ref.) |
| 报告类型： | 科技报告 |
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