Study on critical speed of high-speed train running on bridge under strong crosswind

The train-bridge aerodynamic spatial model was established, and the aerodynamic coefficients of train on bridge were calculated accordingly. The method for acquiring train critical speed under crosswind was derived by the statics, the displacement bring from springs, aerodynamic force, lateral and vertical vibrational inertia force, centrifugal force and gravitational force were considered in the derivation. The results show that the head train's aerodynamic coefficient will reach peak value around wind incidence angle beta = 60, the rear train's aerodynamic coefficient varies constantly with incidence angle. Side force and lift force coefficients will get maximums when train attack angle theta = 6 degrees, overturning moment coefficient absolute get maximum at theta = -6 degrees. For train's overturning stability, crosswind from the inner of curve blows to the head train running on the windward line of bridge is the most dangerous situation.