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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。
Taking the section of streamlined box bridge of a long span suspension bridge as the research object, aerodynamic forces of the linear box girder section in different turbulent flow fields were measured by wind tunnel test with pressure measurement, The three-dimensional aerodynamic admittance equation and the chattering force along the cross-directional coherence function were used to establish the chattering analysis method of long-span bridges based on three-dimensional aeronautic admittance. The chaotic vibration analysis method of traditional chattering in aerodynamic admittance and coherence was improved Obvious defects. The results show that the cross-directional correlation of chatter vibration force of flow box section is higher than that of wind speed. The value of aerodynamic admittance depends on the turbulence integral scale significantly. The calculated buffeting force using three-dimensional aerodynamic admittance is in good agreement with the aerodynamic model wind tunnel test.