世界第一高钢桁梁斜拉桥动力特性试验研究

以跨径为720 m、桥面距地面516 m的世界第一高钢桁梁斜拉桥—北盘江大桥为例,采用有限元软件MIDAS/CIVIL2016建立有限元模型,进行大桥自振特性理论分析。介绍了钢桁架斜拉桥动力荷载试验方法和过程,对大桥的固有频率、动应变等实测参数与理论进行了对比。试验结果表明,大桥数值分析与实测数据吻合较好,实测整体刚度大于理论刚度,具有一定的安全储备,结构受力特性正常,可为同类钢桁梁斜拉桥检测评定提供参考。

Experimental Study on Dynamic Characteristics of the World's Highest Steel Truss Cable-stayed Bridge

In this paper,the world's highest steel truss cable-stayed bridge—BeiPanJiang Bridge with a span of 720 meters and a bridge surface of 516 meters from the ground is used as an example.The finite element model of finite element software MIDAS/CIVIL2016 was used to establish a finite element model for the theoretical analysis of the self-vibration characteristics of the bridge.The dynamic load test method and process of steel truss cable-stayed bridge are introduced,and the measured parameters such as natural frequency and dynamic strain of the bridge are compared with the theory.Research test results show that the numerical analysis of the bridge with the measured data agree well,found the overall stiffness greater than the theoretical stiffness,with a certain safety margin,the structure characteristic of normal force,provides a reference for the detection and evaluation of similar steel truss cable-stayed bridges.