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将钢轨和梁体视为杆单元,轨枕视为梁单元,扣件阻力、道床阻力和桥墩刚度视为弹簧单元,建立了计算连续梁桥上无缝道岔伸缩力与位移的有限元力学模型,根据变分原理和“对号入座”法则建立了模型求解的非线性方程组,分析了道岔设计参数对桥上无缝道岔伸缩力和位移的影响。研究结果表明:伸缩调节器布置在道岔的后端,连续梁固定墩的纵向力可降低43.2%;增加连续梁固定墩纵向刚度有利于减小钢轨位移;连续梁固定支座的位置对系统的受力与变形有双重影响,实际设计时应综合考虑。
The rail and beam body are regarded as the rod unit, the sleeper is regarded as the beam unit, the resistance of the fastener, the resistance of the rail bed and the rigidity of the piers are regarded as the spring units. The finite element mechanical model for calculating the telescopic force and displacement of the seamless turnout on the continuous beam bridge is established, According to variational principle and “condemnation” rule, the nonlinear equations for the model are established. The influence of the design parameters of turnout on the telescoping force and displacement of the seamless turnout on the bridge is analyzed. The results show that: the retractable adjuster is arranged at the rear end of the turnout, the longitudinal force of the continuous beam fixed pier can be reduced by 43.2%; increasing the longitudinal rigidity of the continuous pier fixed pier is beneficial to reduce the rail displacement; Force and deformation have a dual impact, the actual design should be considered.