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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。
Based on the introduction of experimental principles and test methods for identifying the aerodynamic admittance function, the experimental study of the aerodynamic admittance function of the truss girder bridge with the Balinghe Bridge and Guozigou Bridge as an example is carried out. Comparison of lift admittance, resistance admittance and moment of inertia admittance at different angles of attack and wind speed is carried out. The characteristics of aerodynamic admittance function of truss girder bridge are summarized. Numerical aerodynamic conductance of truss structure section is obtained by numerical fitting technique Empirical Fitting Formula of Na Function. Based on the formula, the frequency domain analysis of buffeting of Balinghe Bridge and Guozigou Bridge was made and compared with the results of wind tunnel test. The results show that the calculated values are in good agreement with the experimental values, The correctness of the aerodynamic admittance recognition method and the validity of the fitting formula.