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针对两座典型的高速铁路大跨度预应力混凝土连续梁,在考虑收缩徐变后建立了列车-连续梁空间振动的有限单元分析模型,以德国低干扰谱生成轨道不平顺样本作为激励源,对两座大跨度连续梁的车桥空间振动响应进行了计算分析,结果表明:对于大跨度混凝土连续梁,考虑收缩徐变后,两座连续梁的脱轨系数和轮重减载率均在容许范围内,但数值都有所提高,脱轨系数最大增幅约4%,轮重减载率的最大增幅约10%;两座连续梁墩顶横向位移的增幅在约2%的范围内波动,混凝土收缩徐变对连续梁墩顶横向位移的影响不大;当列车速度以超过275m/s速度运行且考虑混凝土收缩徐变时,两座连续梁的动车Speling舒适性竖向指标会下降一个等级,列车运行速度越高,混凝土收缩徐变对舒适性指标的影响越明显,在设计过程当中必须考虑混凝土收缩徐变对列车走行性的影响。
Aiming at two typical long-span prestressed concrete continuous beams of high-speed railway, the finite element analysis model of space vibration of train-continuous beam is established after considering shrinkage and creep. The low-perturbation track generated by German low-interference spectrum is used as excitation source, The results show that the derailment coefficient and wheel load reduction rate of two continuous beams are within the allowable range after considering the shrinkage and creep of long-span concrete continuous beams. , But the numerical values all increased. The maximum increase of derailment coefficient was about 4% and the maximum increase of wheel load reduction rate was about 10%. The amplitude of lateral displacement of two continuous beam piers fluctuated within about 2%, and the concrete shrinkage When the train speed exceeds 275m / s and considering the shrinkage and creep of concrete, the vertical index of Speling comfort for two continuous beams will decrease by one grade. The train The higher the running speed, the more obvious the influence of the shrinkage and creep of concrete on the comfort index. The influence of shrinkage and creep of concrete on the running of the train must be considered in the design process.