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双向预应力混凝土框架箱梁在国内高铁站轨道桥梁中开始得到应用,为了掌握该结构形式复杂的受力变形特性,本文介绍了一种基于光纤光栅传感技术的轨道层桥梁变形同步监测系统,通过在结构关键位置布设光纤光栅传感器,对列车进出站过程多个截面变形进行同步监测,在列车运营1年时间内共捕捉9种不同的荷载模式及其变形数据,监测结果显示,随着列车进出站,结构会出现明显的周期性变形,振幅由车厢自重与乘客重量决定,变化周期与列车车速表现为负相关,在列车进站和出站期间,结构变形有明显的对称关系;而横向主梁关键位置监测到微小的应变,说明列车荷载通过横向主梁往两端传递,但相邻轨道间影响很小。
Two-way prestressed concrete box girder began to be applied in the domestic high-speed railway track bridges. In order to grasp the complex deformation and deformation characteristics of the structure, this paper introduced a synchronous monitoring system of bridge deck deformation based on FBG sensing technology, By arranging FBG sensors in the key position of the structure, the multi-section deformation of the train entering and leaving the station was synchronously monitored. Nine different load modes and deformation data were captured within one year of train operation. The monitoring results showed that with the train In and out of the station, the structure will have obvious cyclical deformation. The amplitude is determined by the deadweight of the passenger compartment and the weight of the passenger. The change cycle is negatively correlated with the train speed performance. During the entering and leaving of the train, the structural deformation has obvious symmetrical relationship. The minor strain was monitored at the key position of the main girder, indicating that the train load was transmitted to the two ends by the transverse main girder, but the impact between adjacent orbits was very small.