Distribution Regularity and Homogenization of Track Rigidity for Ballastless Turnout
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摘要: 为了揭示道岔铺设在无碴轨道上的刚度分布规律,建立了道岔轨道刚度有限元计算模型.模型中考虑了钢轨抗弯刚度、扣件刚度、基础刚度、滑床台、护轨及间隔铁等因素的影响.以12号提速道岔为例,计算了道岔铺设在无碴轨道上的整体刚度.结果表明:轨道刚度在纵向和横向都存在严重不平顺,里轨与基本轨的整体刚度比最大约为2.418,里轨整体刚度纵向变化率最大约为242%.此外,为了消除道岔铺设在无碴轨道上的刚度不平顺,运用所建立的模型,探讨了均匀道岔轨道刚度分布的扣件刚度设置方式.Abstract: To identify the variation rule of track rigidity of a turnout laying on ballastless track,based on FEM(finite element method) a calculational model for track rigidity was established.In the model,the flexural rigidity of rails,the rigidity of fastenings,the rigidity of subgrade,slide plate,guard rail and spacer block are taken into account.The track rigidity of a Chinese No.12 speeding-up turnout,as an example,was calculated.The calculational results show that the rigidity of track is very uneven in the lognitudinal and transverse directions,the maximum ratio of total rigidity of inner rail and outer rail is 2.418,and the maximum longitudinal variety of total rigidity of inner rail reaches up to 242%.In addition,the disposal approach of rigidity of rail fastenings was discussed based on the model so as to eliminate the variety of track rigidity of a turnout and homogenize the rigidity of track.
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Key words:
- turnout /
- rigidity /
- ballastless track /
- homogenization /
- finite element method
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