榕江特大桥吊杆抗风性能评估

摘要

当风绕过非流线型断面的吊杆时,会产生漩涡和流动的分离,形成复杂的空气作用力,使吊杆出现纵向振动、横向振动或扭转振动.为确保榕江特大桥吊杆的抗风性能能够满足要求,分别建立了三维全桥和吊杆有限元计算模型,然后依据既有抗风评估理论,综合评估了吊杆的抗风性能.通过计算发现:长吊杆的涡激共振起振风速低于设计值,长吊杆的驰振临界风速也不能满足设计需要.计算结果为进一步对吊杆进行风洞试验研究以及设计合适的抗风措施提供数值参考.%The vertical, lateral and torsional vibration of non-streamline suspenders will be generated under wind load acting. To ensure the wind-resistant performance of suspenders of Rongjiang bridge, a three-dimensional whole bridge finite element model and sole suspender finite element model were erected, and than the wind-resistant performance was evaluated. The calculated results present that; the start-oscillation wind speed of vortex induced vibration of some long suspenders is less the corresponding design value. So, some vibration attenuation measures should be taken on the suspenders.