用一种新的结构-土壤相互作用方法,模拟沿过桥铁路行驶的高速列车引起的地面振动
Yuanpeng He1, Xiaozhen Sheng2, Jian Han1
1School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
一种新的底结构方法通过结合2.5D FE-BE和3D FE模型,准确地模拟高速列车的振动. 这种方法分析了环境振动,并评估了跨桥铁路的振动减少策略.
科学领域:
- 计算力学是计算力学.
- 铁路工程 铁路工程是指铁路工程.
- 对振动进行分析.
背景情况:
- 高速列车造成的地面振动对铁路行业来说是一个重大问题.
- 模拟复杂的火车 - 轨道 - 桥梁 - - 堆 - 土壤相互作用是具有挑战性的,因为分析难以处理和传统的数值方法在模拟无限土壤领域的局限性.
研究的目的:
- 引入一种新的基层结构方法来分析火车-轨道-桥梁-基层-堆-土壤相互作用.
- 准确模拟高速铁路系统的动态行为,特别是在大桥上.
- 探索环境振动特征并评估减振措施.
主要方法:
- 开发一种混合基底结构方法,将2.5维有限元素-边界元素 (2.5D FE-BE) 方法和一个局部3维有限元素 (3D FE) 模型相结合.
- 2.5D FE-BE方法用于无限长周期结构的动态 (轨道-桥梁-支柱-土壤).
- 使用本地3D FE模型进行详细的堆土相互作用分析.
主要成果:
- 拟议的模型与现场测量得到了验证,证明了其预测准确性.
- 该方法已成功应用于研究跨桥高速铁路的环境振动特性.
- 分析了像铁路紧固件,轨道板和桥梁轴承等减振措施的有效性.
结论:
- 创新的基层结构方法有效地解决了火车 - 轨道 - 桥梁 - 支柱 - 堆 - 土壤相互作用的复杂性.
- 这种方法可以准确模拟地面振动,并评估高速铁路的缓解策略.
- 该研究为设计更安静,更可持续的高速铁路基础设施提供了宝贵的见解.
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