DYNAMIC RESPONSE CHARACTERISTICS OF THE TALL NOISE BARRIER ON RAILWAY STRUCTURES DURING PASSAGE OF TRAINS AND ITS DESIGN METHOD

DOI Web Site

Bibliographic Information

Other Title
  • 列車通過時の鉄道構造物上防音壁の動的設計法

Description

 The tall noise barrier recently installed on Shinkansen structures has a low natural frequency; therefore, it may resonate with dynamic loads such as train winds which have not been a crucial condition for design. The aim of this study is to evaluate the dynamic response characteristics of the noise barrier and to propose a dynamic design method of the noise barrier on the basis of the measurement and numerical analyses. As a result of the study, it has been found out that the dynamic response of the noise barrier mainly results from the vibration of the middle slab excited by the train load when the train runs at the speed slower than 200km/h. On the other hand, more than 90% of its excitation is attributed to the train wind when the train runs at the speed faster than 200km/h, which indicates that for such high speed the design of noise barrier requires the consideration of only the train wind. The dynamic response of the noise barrier excited by the train wind consists of the resonance effect between pulse excitation of the train wind and the natural frequency of the noise barrier and overlapping effect of the tail pulse of passing train. In addition, the dynamic response of the noise barrier has been generalized and two design methods have been proposed: a precision method based on simulation and a simplified method. The range of application of 1.0kN/m2 previously used as the design load has been made clear based on the natural frequency of noise barrier.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top