Static And Dynamic Design Of Wind Barrier Along The Railway In Wind Area

Based on the finite element software ANSYS, the static and dynamic responses of wind barriers on the roadbed and bridges are calculated under the wind load and train-induced load and the fatigue performance of steel columns of wind barrier on the bridge is researched.Due to strong winds, many train overturning accidents have occurred in domestic and foreign, wind barrier can efficiently reduce these accidents. The research of wind barrier is mainly dedicated to structural design, such as height, the distance from the track, porosity, and so on, rarely focused on the dynamic performance and the fatigue of wind barrier. But the fatigue analysis of wind barrier is essential due to its main load characteristics (wind load and train-induced load). Therefore, this paper not only studies the static and dynamic properties of wind barrier, but also analyzes fatigue performance to ensure the operation safety.The wind barrier with certain porosity is the most advantageous one in the four kinds of wind barriers which may take various forms and have low cost. Therefore, this type of wind barrier is adopted as an example in the embankment and bridge. The study of wind barrier on bridge is divided into two parts, static and dynamic. The horizontal wind load, which includes 63 load cases based on various combinations of wind speed and train speed, is of importance for the static calculation. The response results of wind barrier are described by analyzing the data of displacement and stress considering 63 types of conditions. For dynamic analysis, the comparison of displacement of steel column and windbreak net are considered through four varying combinations of pulse power of wind and train. The maximum displacement and stress of steel column are extracted and the dynamic amplification factor is acquired by comparison to static finite element method.The most unfavorable position of fatigue analysis is determined by static calculation and herein the fatigue analysis is mainly applied to the bottom of the steel column. The fatigue of structures is depending on the stress amplitude produced by repeated loads and the service life of structures is evaluated in according to S-N curve and fatigue damage criteria.