大跨度刚构桥悬臂施工状态的抗风性能研究
Study on Wind Resisting Performance of Long-Span Rigid Frame Bridge in Its Cantilever Construction Stage
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摘要: 以主跨为190 m的预应力混凝土三跨连续刚构桥作为研究对象,通过气弹模型风洞试验,讨论了平行两 幅迎风侧梁与背风侧梁的6分力特性,不同风向偏角对刚构桥风致响应的影响,然后,结合试验结果和数值计 算,比较分析了横向连系对平行两幅梁风致响应的抑振作用,分析表明,对于由平行两幅箱梁组成的大跨度刚构 桥,其悬臂施工时将两梁横向相连对减少结构的风振横向响应是十分有效而便利的。Abstract: In this paper, the study is conducted around a three span prestressed concrete (PRC) continuous rigid frame bridge with a main span of 190 m and consisting of two parallelly-arranged roadway boxgirders. By wind tunnel tests of an aeroelastic model, the aerodynamic coefficients of the front and rear girders are discussed and the effect of horizontal angle of airflowβon these coefficients is also studied. Then, a measurement usingthe thin plate to connecthorizontallythe two parallelly-arranged boxgirders is taken, and its vibration suppressing effect on the wind induced response is analytically discussed. It is shown that for long span rigid frame bridges with two parallelly-arranged roadway box girders, connecting horizontally the two girders in cantilever construction stage can reduce the wind induced horizontal vibration response effectively and easily.
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Key words:
- wind tunnel tests /
- rigid frame bridge /
- wind resistance
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