A Practical Wheel-Rail Interaction Element for Modeling Vehicle-Track-Bridge Systems
A Practical Wheel-Rail Interaction Element for Modeling Vehicle-Track-Bridge Systems
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DOI：
10.1142/s0219455419500111
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发表时间：
2019-02
影响因子：
3.6
通讯作者：
Q. Gu;Yongdou Liu;Wei Guo;Weiquan Li;Zhi-wu Yu;Li-zhong Jiang
中科院分区：
文献类型：
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作者：
Q. Gu;Yongdou Liu;Wei Guo;Weiquan Li;Zhi-wu Yu;Li-zhong Jiang
提出了一种新的实用单元，用于模拟车辆-轨道-桥梁（VTB）耦合系统的轮轨垂向相互作用（WRI）。WRI是随时间和位置变化的，这使得VTB系统的仿真变得复杂。新单元采用位置相关的内阻力来模拟WRI，这使得VTB系统的有限元（FE）模型在分析中保持不变。该单元能够模拟非线性的WRI、钢轨不平顺和钢轨附加位移。“附加”位移是由WRI引起的附加位移，它是由单元节点位移插值得到的，通常被现有模型忽略，但在某些情况下可能是不可忽略的。WRI元素被实现到一个通用的有限元软件框架，OpenSees，并验证了简支梁的动态分析受到移动簧载质量。此外，一个现实的VTB系统与移动的四轮车辆进行了调查，以评估的情况下，额外的位移和非线性WRI应考虑。最后，以另一个实际的VTB系统为例，研究和比较了轨道不平顺和地震对WRI系统动力响应的影响。
A novel practical element is presented for simulating the vertical wheel-rail interaction (WRI) of vehicle-track-bridge (VTB) coupling systems. The WRI is time- and location-varying, which makes the simulation of the VTB system complicated. The new element simulates the WRI using a location dependent internal resisting force, which enables the finite element (FE) model of the VTB system to remain unchanged in analysis. This element is capable of simulating the nonlinear WRI, the rail irregularity and the ‘additional’ displacement of the rail. The ‘additional’ displacement is the extra displacement caused by the WRI besides that interpolated from the element nodal displacements, which is usually ignored by existing models, but may be non-negligible in some cases. The WRI element is implemented into a general FE software framework, OpenSees, and verified by the dynamic analysis of a simply-supported beam subjected to a moving sprung mass. Furthermore, a realistic VTB system with a moving four-wheel vehicle is investigated to evaluate the cases where the additional displacement and nonlinear WRI should be considered. Finally, using another realistic VTB system subjected to rail irregularities and earthquakes, the effects of rail irregularity and earthquake on the dynamic responses of the WRI system are studied and compared.