Fatigue Characteristic of High-Frequency Vibration for CRTS Ⅱ Track Slab
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摘要:
列车轮载作用会引发轨道板的高频自振效应. 为分析高频荷载下CRTS Ⅱ型轨道板的疲劳特性以及板体自振效应对疲劳寿命的影响程度,基于现有的疲劳损伤准则,探究轮对作用间隙阶段轨道板自振影响下的疲劳特性. 对脱空长度影响下轨道板的疲劳寿命进行预测,并与仅考虑荷载作用次数的结果进行对比. 结果表明:轨道结构完好时,列车轮载引发轨道板伤损的可能性较小;若列车行车速度为360 km/h,列车轮载在引发轨道板共振前即发生板底开裂;轨道结构完好时,列车轮载引发的板体自振效应对轨道板疲劳损伤影响程度最大,此时列车轮载对轨道板产生约1.8倍的疲劳荷载当量;当轨道板脱空长度大于2.0倍枕距后,可忽略板体自振对疲劳损伤的影响;轨道板的脱空长度大于3.2倍枕距后,现场无砟轨道难以维持60 a的使用寿命.
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关键词:
- 无砟轨道 /
- CRTS Ⅱ型轨道板 /
- 疲劳特性 /
- 板体自振 /
- 局部脱空
Abstract:The effect of the wheel load could cause the self-vibration effect of high frequency for the track slab. To analyze the fatigue characteristic of CRTS Ⅱ track slab under high-frequency load and the effect of the self-vibration of the track slab on its fatigue life, the fatigue characteristics of the track slab under the influence of this self-vibration during the interval in the wheelset was explored on the basis of existing fatigue damage criteria. The fatigue life of the track slab was predicted with reference to the effect of the de-bonding length, and the results obtained were compared with the results obtained when only the number of load actions was considered. Results show that, the possibility of damage to the track slab caused by the train wheel load is reduced when the track structure is intact. The bottom of the track slab would crack before resonance triggering occurred if the train speed was 360 km/h. When the track structure is intact, the self-vibration effect in the track slab caused by the wheel load has its greatest impact on the fatigue damage to the track slab, and the wheel load produces approximately 1.8 times the equivalent fatigue load to the track slab. The effect of the self-vibration effect in the track slab on the fatigue damage could be ignored when the slab de-bonding length is more than twice the distance between sleepers. When de-bonding length of the track slab is more than 3.2 times the distance between sleepers, it becomes difficult for the ballastless track on-site to maintain its expected 60-year service life.
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表 1 主要计算参数
Table 1. Main calculation parameters
部件 项目 取值 钢轨 弹性模量/Pa 2.06 × 1011 惯性矩/m4 7.745 × 10−3 密度/(kg•m−3) 7850 泊松比 0.30 扣件刚度/(N•m−1) 6.0 × 107 轨道板 弹性模量/Pa 3.55 × 1010 密度/(kg•m−3) 2400 泊松比 0.20 宽度(厚度)/m 2.55 (0.20) CA砂浆 弹性模量/Pa 7.0 × 109 厚度/m 0.03 单向受压刚度/(N•m−2) 5.95 × 1011 -
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