Abstract

One approach for upgrading existing high-speed railway bridges which are susceptible to excessive vibrations is to install damping devices. In this article, a model of a simply supported bridge with supplemental fluid viscous dampers installed between the superstructure and the abutments is derived based on an arbitrary mode of vibration. The aim is to ensure the robustness of the proposed vibration mitigation method by conducting Monte Carlo simulations including uncertainties associated with the bridge-damper system. From this statistical screening, it is possible to evaluate the probability of exceedance of a stipulated acceleration level, as well as studying the sensitivity of the ingoing random variables. This probabilistic evaluation highlights the necessity of conducting a statistical assessment to determine an estimate for the distribution of the acceleration limit and model uncertainty for dynamic analyses. The results show that the required damping coefficient could be multiply reduced, as compared to a deterministic analysis.

摘要

升级现有易受过度振动影响的高速铁路桥梁的一种方法是安装阻尼装置。在本文中，基于任意振动模式推导出了在上部结构和桥台之间安装有补充流体粘性阻尼器的简支桥模型。目的是通过进行蒙特卡罗模拟（包括与桥阻尼系统相关的不确定性）来确保所提出的减振方法的稳健性。通过这种统计筛选，可以评估超出规定加速度水平的概率，以及研究传入随机变量的敏感性。这种概率评估强调了进行统计评估的必要性，以确定加速度极限分布和动态分析模型不确定性的估计值。结果表明，与确定性分析相比，所需的阻尼系数可以成倍减少。