桁梁桥气动导纳函数的试验研究

在介绍识别气动导纳函数的试验原理和试验方法的基础上,以坝陵河大桥和果子沟大桥为例进行了桁梁桥气动导纳函数的试验研究.对不同攻角、不同风速下的升力导纳、阻力导纳和升力矩导纳进行对比分析,概括了桁梁桥气动导纳函数的特点,并利用数值拟合技术,得到桁架结构断面气动导纳函数的经验拟合公式.基于该公式,对坝陵河大桥和果子沟大桥进行了抖振频域分析,并与风洞试验抖振响应测量结果做对比,表明计算值与试验值具有良好的一致性,证明了桁梁气动导纳识别方法的正确性和拟合公式的有效性.

Experiment and Study on Aerodynamic Admittance Function of Truss Girder Bridge

Based on introducing the test methodology and the identification method of aerodynamic function,the wind tunnel test is carried out to investigate aerodynamic admittance function of truss girder bridge by taking Baling River Bridge and Guozi Ditch Bridge as examples.By discussing three types of ae-rodynamic admittance functions under different attack angles and wind speeds,the characters of aerodynamic admittance function of truss girder bridge are summarized and its fitting formula is proposed by using numerical fitting technique.Based on the formula,the buffeting responses of Baling River Bridge and Guozi Ditch Bridge are analyzed in frequency domain.The good agreement between buffeting response tested and calculated ones proves validity of the testing method for aerodynamic admittance function of the truss section and fitting formula.