摘要
基于有限单元法,建立了无缝道岔纵向力与位移的计算模型,根据纵向力、线路阻力、钢轨及岔枕位移的相互关系建立平衡方程组,并采用牛顿迭代法求解。分析了轨温变化幅度、道岔号码、辙叉型式、辙跟型式、道岔群的联结方式、焊接型式、扣件阻力、道床阻力、限位器阻力、间隔铁阻力、线路爬行、铺设锁定轨温差、岔枕抗弯刚度等因素对无缝道岔受力及变形的影响。轨温变化幅度越大、线路爬行量越大、与相邻线路及道岔的铺设轨温差越大,对无缝道岔各部件的受力及变形越不利。而其它因素对无缝道岔位移及纵向力分布各有不同程度的影响,应综合分析,优化设计,才能确保无缝道岔各部件的受力及变形均在容许限度内。
Based on the finite element principle, a nonlinear calculating model of the continuous welded turnout is proposed. According to the relations between temperature forces, resistances and displacements, the equilibrium equations can be obtained. Newton iterative procedure is utilized to obtain the solution at each temperature change level. The influences of some parameters on the rail displacements and longitudinal forces of welded turnout are analyzed, such as the algebraic difference between the rail temperature and the stressfree temperature, the number of turnouts, the style of turnout frog, the style of turnout heel, the linkstyle of two turnouts, the style of rails welding, the fastening resistance, the ballast resistance, the resistance of spacing restricting device at heel, the resistance of spacing iron block at the end of wing rail, the rail creep forces, the different algebraic differences of the stressfree temperature,and the lateral rigidity of switch tie.The additional temperature forces of the stock rails, the inner rail displacements, the shear forces acted on the bolts of spacer at heel and the shear forces acted on the bolts of spacing iron block at the end of wing rail increases with the algebraic difference between the rail temperature and the stressfree temperature. The variation of other factors will influence the rail displacements and longitudinal forces of welded turnout to some extent. In order to guarantee the displacements and longitudinal forces stay within the allowable limit, the parameters will be appropriately designed.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2003年第2期58-66,共9页
China Railway Science
基金
铁道部科技开发计划项目(2001G041)
