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针对制振措施可能影响到结构的静力稳定性的问题,结合某大桥节段模型风洞试验,以中央稳定板、栏杆透风率、风障和车辆作为分析三分力系数的影响因素,共模拟了13种工况,得到各种制振措施对桁架桥主梁静力三分力系数的影响规律。结果表明:三分力系数的改变直接影响到静风荷载,这些参数的变化对主梁静风荷载的影响不容忽视;中央稳定板的不同设置方法对主梁静力三分力系数的影响明显,单独设置上中央稳定板时主梁阻力系数显著增大,在大风攻角时增幅超过100%;下中央稳定板和封闭栏杆的组合设置对主梁静力影响较小;风障的设置显著增大了主梁阻力系数。
In view of the fact that the vibration control measures may affect the static stability of the structure, the wind tunnel test of a bridge segment model is used to analyze the influence factors of the third-component force coefficient by using the central stabilizer plate, the parapet air permeability, wind barriers and vehicles Thirteen kinds of working conditions were simulated, and the influence law of various vibration control measures on the static third-part force coefficient of the main girder of truss bridge was obtained. The results show that the change of the third component force directly affects the static wind load. The influence of these parameters on the static wind load of the main girder can not be ignored. The influence of different setting methods of the central stabilizing plate on the static third component force is obvious. The central girder stability coefficient of the main girder drag coefficient increased significantly in the gale angle of attack increased by more than 100%; the lower central stabilizer plate and the combination of closed railings on the main beam less static force; wind barrier significantly increased the main beam resistance coefficient.