桁架桥主梁三分力系数试验

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。

Experimental study on three-component force coefficients of truss girder cross-section

The vibration damping measures may affect the static stability of the structure.Taking a bridge as the engineering background,through the section model wind tunnel test,the influence of vibration damping measures on three-component force coefficients of the structure was studied to improve the structural characteristics.The influence factors include the central stabilizer,baluster drafty rate,windbreak,and vehicle,the 13 working conditions were simulated.The results show that the changes of three-component force coefficients affect the static wind loads directly,and the influence of changes of these parameters on the static wind load cannot be ignored.The different setting method of central stabilizer has a significant influence on the static three component coefficient of the girder.The central stabilizer setting on board alone has a significant increase of drag coefficient,it is more than 100% at large wind attack angle.The central stabilizer setting on board and bottom of the girder has a small influence on the aerostatic factor.Windbreak has a significant increase to the draft coefficient of main girder.