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中文摘要：
涡激力沿主梁跨向具有偏相关性,基于Scanlan涡激力经验线性模型,假定涡激振动风速下,整个梁段涡脱频率锁定,提出适用于变截面连续梁桥的三维涡激力经验线性模型,从而建立节段模型与变截面梁实桥之间涡激振动幅值之间的关系。通过变截面梁几个典型位置截面的节段模型风洞试验,获得描述整个变截面主梁三维涡激力经验线性模型等效参数,实现对整个变截面连续梁桥涡激振动响应的评估。通过某典型的三跨变截面连续钢箱梁桥涡激振动风洞试验,验证理论的有效性。
英文摘要：
Vortex-induced aerodynamic force was partial correlation along the span.Based on the Scanlan′s semi-empirical linear model,a linear theory of vortex induced vibration of the long span continuous steel box girder bridge with variable cross-section was established by assuming that the vortex shedding frequency of the whole span was locked in.The methodology for applying sectional models which were selected from typical position of variable cross-section box girder bridge into prototype bridge was discussed.The line theory parameters which provided detailed depiction of variable section box girder 3-D vortex induced force were obtained.And the vortex induced resonance of the whole span was evaluated.Validity of proposed theory was proved by a series of wind tunnel tests on a three spans continuous variable section bridge.
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