哈尔滨四方台斜拉桥模态参数和索力识别

桥梁的模态参数是修正有限元模型、识别损伤及桥梁状态评估的重要参数。动力测试是获得模态参数的必要途径。建立了哈尔滨四方台大桥的有限元模型；利用8个力平衡加速度传感器采用分组测试的方式测试了桥面加速度，利用压电传感器测试了斜拉索的加速度；联合NExT法和ERA法进行了斜拉桥模态参数识别，并将识别结果与有限元模型的计算结果进行了对比分析；采用拉索基频的频差拟合识别法进行频率及索力识别，并进行了实测索力与设计索力的对比分析

Identification of modal parameters and cable tension of harbin sifangtai bridge

Modal parameter of bridge is very important for finite element updating, damage identification and bridge condition assessment. Dynamic test is the necessary approach to obtain the modal parameter of bridge. Finite element model of Harbin Sifangtai Bridge was established, eight accelerometers with force feedback was applied to measure acceleration of bridge deck by the way of group test, piezoelectric accelerometer was applied to measure acceleration of cable, the combined method the NExT and ERA was applied to identify cable-stayed bridge modal parameter and the identification result was compared with the calculated result of finite element, frequency difference fitting method was introduced to identify frequency and tension of cable and the result was compared with the design cable tension of real bridge.