Abstract：In order to investigate the span-wise correlation characteristics of buffeting forces of high-speed train, two kinds of atmospheric turbulence fields were established in XNJD-3 wind tunnel. The scale of the bridge segment and vehicle models was 1∶29.7. Based on the simultaneous pressure measurement method, the distribution of buffeting forces of still trains was obtained. Then, the influences of those factors, including wind attack angles, turbulent flow fields and locations of trains, on the spatial correlation of the buffeting forces was analyzed in time domain and frequency domain. Furthermore, relationships between the correlation coefficients of buffeting forces and incident flow features were studied, the mechanism and influence factors were summarized, and the fitting formulas of span-wise coherence function of buffeting forces were proposed. The results show that the span-wise correlation of lateral buffeting forces is close to the correlation of downwind fluctuating wind. The correlation of lift force and torsion moment is slightly smaller than that of the vertical fluctuating wind. Eventually, future research directions are pointed out. The conclusions drawn in this study can be referred by those studies on the comfort of trains running on similar bridges.
