铰接式岔枕受力与振动响应分析

Comparison Investigation on Acting Force and Dynamic Behavior of Articulated Switch Sleeper in Turnout System

考虑枕下道床支承的非线性特性和联结铰的特殊结构,建立整组道岔有限元计算模型,分析比较了列车过岔时铰接式与普通长岔枕的受力及动态响应.结果表明:与普通轨道结构相比,铰接式岔枕轨道结构整体刚度较低且变化均匀,改善了道岔区综合受力环境;岔枕疲劳强度较高;改变了普通岔枕的振动曲线,极大程度地降低了高速列车过岔时未行车股道岔枕末端对于道床的冲击,延长了道床养护维修周期.

The nonlinear characteristic of ballast＇s support under sleeper and the special construction of articulated joints being considered, the acting force and vibration response of articulated and ordinary switch sleeper are simulated as the trains running through the turnout with a calculation model for global turnout based on finite element method （FEM）. Results show that compared with the common one, the track with articulated switch sleepers has a lower rigidity which changes evenly along the railway＇s longitudinal direction and improves its dynamic performance. Furthermore, the fatigue strength of articulated switch sleeper is higher with its lower stress amplitude. Additionally, when the vehicles running on the turnout main （or turnout branch）, the switch sleepers＇ vibration curves have changed, the articulated joints have weakened effectively the attack from switch sleeper＇s end in the turnout branch （or turnout main） to ballast bed underneath whose service life will be prolonged greatly.