摘要
为研究斜拉桥串列拉索或悬索桥无吊杆串列主缆在风荷载作用下的相互干扰情况,通过自行设计的拉索试验装置,对两串列拉索进行了一系列的气弹模型风洞试验.试验得到索间距W/D在5.85～20变化(W为拉索中心距,D为拉索直径),风偏角在-90°～90°范围内变化时上下游索的一些响应特性.试验观测到了明显的尾流驰振现象,且试验结果表明索间距与风偏角的变化对串列拉索是否出现尾流驰振都有明显的影响.在发生尾流驰振时,以下游索面外的振动为主,且其临界风速随索间距W/D变小而降低;在同一索间距下,0°风偏角为最不利状态,且负风偏角比正风偏角更容易发生尾流驰振.
In order to investigate the wake interference of the stay-cables or the cables of suspension bridges without suspension rod, aerodynamic characteristic of two parallel cables were examined through a series of wind tunnel tests employing aeroelastic cable models. Cables with different spacing ratio W/D （where W is the spacing of centers of cables , D is the diameter of the cable ） , varying from 5.85 to 20 , and different wind yaw angleβ, changing from - 90°to 90°, were tested at uniform flow . Consequently, obvious wake galloping was observed in the experiment, and the results indicated that there was an prominent influence for wake galloping with the change of spacing ratio and wind yaw angle. The critical wind of wake galloping reduced with decreasing values of the spacing between the cable, and the out-plane response of downstream cable was most dominant. The results also indicated that the yaw angle of 0°was the most disadvantage angle at same spacing , and it was easier for negative yaw angle to appear wake galloping than positive yaw angle.
出处
《动力学与控制学报》
2006年第2期179-186,共8页
Journal of Dynamics and Control
关键词
气弹模型
风洞试验
串列斜拉索
相互干扰
尾流驰振
aeroelastic modeling, wind tunnel testing, tandem cables, mutual interference, wake galloping
