Aerodynamic Effect and Maintenance Strategy of Metal Barriers with Different Heights for High Speed Railway
In combination with the setting characteristics and routine inspection & maintenance of high speed railway metal barriers,this paper takes 1.72 m and 2.15 m high metal barriers as research objects and carries out aerodynamic effect comparative analysis through aerodynamic simulation,field test and other research methods.The results show that:The fluctuating wind pressure of the train is characterized by a large area of column foundation and a small area near the top of the column;at the same speed,the difference between the fluctuating force of 1.72 m and 2.15 m high metal barrier is less than 10％,the difference in dynamic displacement of steel columns is about 2 times,and that of dynamic displacement of unit panels is about 40％.The ability of columns to resist lateral force has a high correlation with structural height;affected by the change of aerodynamic load,the fluctuation range of structural vibration response at the same speed level can reach 50％;the vibration response of the metal barrier can reflect the difference in dynamic performance of the structure,and the difference of dynamic displacement of different unit panel crossing metal barriers can reach 1 time.It is suggested that attention should be paid to the change in the dynamic performance of the structure during subsequent inspection and maintenance of the metal barrier.
high speed railwaymetal barrieraerodynamic effectvibration response testO&Mvibration response
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