摘要
The wind-induced vibration of stay cables of cable-stayed bridges, which includes rain-wind-induced vibration （RWIV） and dry galloping （DG）, has been studied for a considerable amount of time. In general, mechanical dampers or surface modification are applied to suppress the vibration. In particular, several types of surface-modification cable, including indentation, longitudinally parallel protuberance, helical fillet, and U-shaped grooving, have been developed. Recently, a new type of aerodynamically stable cable with spiral protuberances was developed. It was confirmed that the cable has a low drag force coefficient, like an indented cable, and that it prevented the formation of water rivulets on the cable surface. In this study, the stability for RWIV of this cable was investigated with various flow angles and protuberance dimensions in a wind-tunnel test. It was found that the spiral protuberance cable is aerodynamically stable against both RWIV and DG for all test wind angles. The effects of the protuberance dimensions were also clarified.
学界对包括风雨激振(RWIV)和干索驰振(DG)在内的斜拉桥拉索的风致振动等的研究已经有相当长的时间。一般来说,我们会应用机械阻尼器或表面处理来抑制振动。特别是已开发出几种表面处理拉索,包括压痕、纵向平行突起、螺旋角和U形开槽。最近又开发了一种带螺旋突起的新型空气动力学稳定拉索,这种拉索已被证明具有与锯齿状拉索相似的低阻力系数,并且可以防止拉索表面形成水线。在本研究中,应用风洞实验对这种拉索在各种来流角度和突起尺寸下的RWIV稳定性进行了研究。发现对于所有测试风角,螺旋突起拉索对于RWIV和DG在空气动力学基础上都能保持稳定,突起尺寸的影响也得到了确认。
