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中文摘要：
通过刚体节段模型高频天平测力法，在优化谱估计参数的基础上，采用互功率谱方法对桥梁闭口箱梁断面的全部6个气动导纳函数进行识别，分析了导纳函数的变化特点；利用识别的气动力参数对闭口箱梁断面进行二维桥梁抖振分析，发现闭口箱梁取实测导纳的响应计算结果远小于导纳函数取1．0的计算值，且导纳取Sears函数的计算结果偏于保守，桥梁断面运动过程中系统阻尼的增加抑制了竖向及扭转抖振响应，在一般风洞试验中使用模拟二维二自由度的节段模型试验，其风洞试验结果应该是偏于安全的．
英文摘要：
By using the high frequency force balance and correlation spectrum method ,all the six aero‐dynamic admittances of box girder model were identified on the basis of the optimization of the param‐eters of spectral estimation .The characteristics of admittance function were analyzed .Two dimen‐sional buffeting response of bridge box girder section were calculated by use of the identified aerody‐namic parameters .It shows that the calculation results with actual admittance are far less than the value when the aerodynamic admittance replaced by one .The wind‐induced responses for the big box beam model obtained conservative results when the admittance replaced by the Sears function .The system damping during the bridge section’s exercise can inhibit the vertical and torsion wind‐induced response .The test results in the two degree and two‐dimensional section model tests in wind tunnel should be on the safe side .
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