中文摘要：

以某大跨悬索桥流线形箱桥梁断面为研究对象,通过风洞试验,用测压法对流线形箱梁断面在不同紊流场中的气动力进行了测量,得出适合流线形箱梁断面的三维气动导纳公式和抖振力沿跨向的相干函数,建立了基于三维气动导纳的大跨桥梁抖振分析方法,改善了传统上计算抖振在气动导纳和相干函数上的明显缺陷。研究结果表明,流线箱型断面抖振力的跨向相关高于风速相关;气动导纳数值显著依赖于紊流积分尺度。利用三维气动导纳计算出的抖振力与气动弹性模型风洞试验吻合良好。

英文摘要：

The buffeting forces of a streamline bridge deck used in a long-span suspension bridge was measured in wind tunnel by synchronies manometer system in different wind fields,and the empirical formula for 3D aerodynamic admittance function（3D AAF） and the coherency function of buffeting forces along the span direction applied to streamline bridge decks.Based on 3D AAF,the buffeting analysis method in frequency domain for long-span bridges was developed to revise the fatal flaw used in traditional buffeting analysis.The analysis result proves that（1） coherences of buffeting forces are larger than coherences of incident wind velocity in vertical direction;（2） the aerodynamic admittance of a bridge deck is affected by the turbulence length scale remarkably.The buffeting response of long-span bridges obtained from the aerodynamic model is consistent with the wind tunnel test result.