临界雷诺数下带人工水线斜拉索气动性能研究  

On aerodynamic characteristics of inclined stay cables with upper rivulet at critical Reynolds numbers

作　　者：杜晓庆[1] 张烨[1] 顾明[2] 

机构地区：[1]上海大学土木工程系,上海200072 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动与冲击》2013年第9期46-49,129,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金创新研究群体科学基金资助(50621062);高等学校博士学科点专项基金资助(20113108120024)

摘　　要：通过风洞试验,在临界雷诺数下,研究带上水线拉索模型的气动性能。测得不同风向角下拉索表面风压分布情况,得到作用在拉索模型上的气动力系数,分析临界雷诺数下拉索的气动稳定性。研究表明:基于准定常假定,在临界雷诺数下,拉索发生风雨激振的可能性较亚临界区低;上水线改变了拉索表面的流体分离并出现分离流再附现象,导致拉索气动力随上水线位置的改变而发生剧烈变化。Aerodynamic characteristics of inclined and yawing stay cables with upper rivulet were investigated by wind tunnel tests in the critical Reynolds number region. The variations of mean wind pressures and aerodynamic forces on the cable model were obtained at several typical wind angles. Furthermore, the aerodynamic stability of the cable was discussed based on Den Hartog's criterion. It is found that the aerodynamic characteristics of cables with upper rivulet change drastically when the Reynolds number increases from the subcritical region to the critical region. The upper rivulet will affect the flow separation and induce reattachment of separated flow on the upper side of the cable. According to the classical galloping theory, the rain-wind-induced vibration of stay cables can still occur at critical Reynolds number; however, the possibility of the aerodynamic instability reduces.

关 键 词：斜拉桥拉索 气动失稳 临界雷诺数 人工水线 风洞试验 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]