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结合月牙河特大桥动力分析和轨道不平顺分析,以及量测所得到的数据,表明桥上线路周期性高低不平顺并非动荷载下桥梁挠度变形造成的,也不是由车桥共振引起的,从所得到的数据分析来看,不平顺值的增长速度随时间的增加而逐渐减小,符合徐变上拱的发展规律。目前桥上线路高低不平顺值尚未达Ⅰ级超限,对行车安全没有造成影响。建议在客运专线建设中,进一步控制长大连续等跨简支梁的徐变上拱,尤其应控制二期恒载轨道铺设后的徐变上拱,并加强桥上线路高低不平顺的检测。桥上线路在达到高低不平顺Ⅰ级超限前,就及时进行大型养路机械捣固或调整扣件作业。由于在桥梁上产生相同的多个波连续作用,应对有关车辆在该特殊高低不平顺作用下的动力学性能进行校核。
Combining the dynamic analysis of the Crescent River Bridge and the track irregularity analysis and the data obtained from the measurements show that the periodic irregularity of the bridge line is not caused by the deflection of the bridge under dynamic loads and is not caused by the resonance of the axle The analysis of the data obtained shows that the growth rate of non-smoothing value decreases with time, in line with the development of the law of creeping arch. At present, the level of the bridge is not smooth enough to reach the level I level, which has no impact on traffic safety. It is suggested that in the construction of passenger dedicated line, further control should be given to the control of the creeping arch of long and continuous spanned simply supported girders. In particular, it should control the creeping arch after the laying of the second stage of constant-load orbit and strengthen the detection of the irregularity of the line on the bridge. Bridge on the road to reach the level of non-smooth Ⅰ level before the limit, timely large-scale maintenance machinery tamper or adjust the fastener operations. Due to the same multiple wave continuous effect on the bridge, the dynamic performance of the vehicle under the special high and low irregularities should be checked.