以主跨为190m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。%In this paper, the study is conducted around a three spanprestressed concrete (PRC) continuous rigid frame bridge with a main span of 190 m and cons isting of two parallelly-arranged roadway box girders. 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 airflow β on these coefficients is also studied. Then, a measurement using the thin plate to connect horizo ntally the two parallelly-arranged box girders is taken, and its vibration supp ressing 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 constructions tage can reduce the wind induced horizontal vibration response effectively and easily.
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