带连接箱开槽箱梁气动导纳识别试验研究

Research on identification of aerodynamic admittance of slot box girder with continuous girder

以中央开槽箱梁这种跨向非一致断面的典型代表西堠门大桥为背景,采用格栅紊流场节段测力和测压相结合的试验方法,基于自谱—交叉谱综合最小二乘法的前提下提出了加权平均跨向相关性的概念,结果表明通过加权平均跨向相关性修正识别抖振力气动导纳的结果有不错的可靠性,并比较了顺风向气动导纳分量与竖向气动导纳分量。

Taking Xihoumen bridge featured with central-slotted girders with inconsistent span directions as the example,the paper adopts the measurement combined with force and pressure of the grid turbulent field section,points out the concept of the weighted average span direction relevance with the premise of self-spectrum and cross spectrum comprehensive least square method,and proves by the result that it has better reliability to identify buffeting aerodynamic admittance by the weighted average span direction relevance,and compares the along-winds and vertical aerodynamic admittances.