As significant differences exist between the alignment of completed long-span bridge of high-speed railway and designed alignment of such a bridge in the acceptance stage due to the influence of temperature,construction deviation,secondary dead load,the vector distance difference method is not suitable for the acceptance of track alignment in long-span bridges and areas such as large-scale settlement of foundations.Aiming at the long-span bridge with ballasted track of high-speed railway with a speed of 250 km/h,the correlation between the chord measurements of 60 m of track geo-metric irregularity and the vertical vibration acceleration of car body was proposed based on the correlation between the different chord measurements of track geometric irregularity and the vertical vibration acceleration of car body.Further-more,the acceptance limit of 10 mm for the mid-point chord of 60 m track static longitudinal level irregularity on the long-span bridge was proposed.Finally,a track longitudinal level irregularity in the form of"four wave peaks and three wave troughs"was preset on a high-speed railway cable-stayed bridge with a main span of 672 m,and verified by the re-al train,which proved the rationality of the proposed limit value.The results show that,for the high-speed railway with a speed of 250 km/h,the relationship between the vertical vibration acceleration of the car body and the 60 m chord meas-urement of track longitudinal level irregularity conforms is linear.The temperature deformation of long-span bridges,as mainly manifested as long wave irregularity,is significant,with an overall inverse correlation between bridge deck eleva-tion and temperature.The preset track longitudinal level irregularity in the form of 60 m cosine wave mainly affects the ride comfort,with minor impact on the running safety.In addition,at the train speed of 275 km/h or below,the maxi-mum vertical vibration acceleration of the car body is 0.98 m/s2,with the maximum Sperling index of 2.47,which is e-valuated as"excellent"and close to the boundary between"excellent"and"good".
关键词
高速铁路大跨度桥梁/预设不平顺/实车试验/轨道静态长波高低不平顺/60m中点弦测法/车体垂向加速度
Key words
long-span bridge of high-speed railway/preset track irregularity/real train test/track static long-wave longi-tudinal level irregularity/mid-point chord method with 60 m chord/vertical vibration acceleration of car body
维普
万方数据