铁路桥梁在高速列车作用下的动力响应分析

DYNAMIC ANALYSIS OF RAILWAY BRIDGE UNDER HIGH SPEED TRAIN

通过理论计算与现场试验研究高速列车与桥梁的动力相互作用。建立了车桥系统分析模型:列车模型每节车考虑27个自由度;桥梁模型采用模态综合法,系统激励为实测轨道不平顺。模拟中华之星列车高速通过秦沈客运专线24m双线预应力混凝土简支箱梁桥的全过程,计算了桥梁在高速列车作用下的动挠度、振幅、梁体加速度、桥墩振幅以及车辆的脱轨系数、轮重减载率、横向轮轨力等动力响应,并与现场实测结果进行了对比。

The dynamic interaction between high-speed train and bridge is studied by theoretical analysis and field test. A computational model of train-bridge system is established. Each vehicle is described by 27 degrees of freedom. The bridge is modeled by modal superposition technique. The measured track irregularities are taken as the system excitation. The whole histories of the China-Star High-Speed Train running through a bridge with 24 m double track prestressed concrete box girders on the Qinghuangdao-Shenyang Special Passenger Railway in China are simulated. The dynamic responses of the bridge such as deflections, lateral amplitudes, lateral and vertical accelerations, lateral pier amplitudes, and the vehicle responses such as derail factors, offload factors and wheel-rail inter-thrusts are calculated and compared with the experimental results.