带有纵向肋条斜拉索风荷载特性研究  

STUDY ON WIND LOAD CHARACTERISTICS OF STAY CABLE WITH LONGITUDINAL RIBS

作　　者：褚泽楷 常幸 孙一飞 韩鹏[1] 刘庆宽 CHU Ze-kai;CHANG Xing;SUN Yi-fei;HAN Peng;LIU Qing-kuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [3]河北省风工程和风能利用工程技术创新中心,石家庄050043

出　　处：《工程力学》2024年第S01期253-257,291,共6页Engineering Mechanics

基　　金：河北省自然科学基金创新研究群体项目(E2022210078);河北省高端人才项目(冀办[2019]63号);河北省高等学校科学技术研究项目(QN2024038);中央引导地方科技发展资金项目(236Z5410G);石家庄铁道大学硕士研究生创新项目(YC202425,YC2023054)。

摘　　要：相关研究表明纵向肋条对斜拉索风雨振有良好的抑制效果,但对斜拉索风荷载特性的影响尚未明确。在斜拉索表面布置了宽度和高度均为5 mm的2根长方体肋条,通过风洞测压实验,研究其在不同雷诺数下环向和展向平均风压分布的影响规律。结果表明:肋条使斜拉索展向风荷载在分离点产生了较强的三维性,风荷载沿展向无明显变化规律;双分离泡区内,肋条对于斜拉索的环向风荷载分布规律影响较小;肋条改变分离点的位置,加快了层流到湍流的转捩,使得临界区提前;在低雷诺数区,肋条会加强斜拉索表面流场的三维性,随着雷诺数的升高,斜拉索表面流场的三维性先增强后减弱,到达双分离泡区后,斜拉索流场的三维性趋于稳定。The previous studies have shown that longitudinal ribs have a good suppression effect on the wind-rain vibration of stay cables,but the influence on the wind load characteristics of stay cables is not yet clear.Two rectangular ribs with a width and height of 5 mm were arranged on the surface of the stay cable.The influence of the average wind pressure distribution in the circumferential and spanwise directions at different Reynolds numbers was studied by wind tunnel pressure measurement experiments.The results show that the ribs make the spanwise wind load of the stay cable produce a strong three-dimensionality at the separation point,and the wind load has no obvious change rule along the spanwise direction.In the double separation bubble zone,the ribs have little effect on the circumferential wind load distribution of the stay cable.The rib changes the position of the separation point,accelerates the transition from laminar flow to turbulent flow,and advances the critical region.In the region of low Reynolds number,the ribs will strengthen the three-dimensionality of the flow field on the surface of the stay cable.As the Reynolds number increases,the three-dimensionality of the flow field on the surface of the stay cable first increases and then decreases.After reaching the double separation bubble region,the three-dimensionality of the flow field on the stay cable tends to be stable.

关 键 词：风洞实验 临界区 风压分布 三维特性 纵向肋条 

分 类 号：U441[建筑科学—桥梁与隧道工程]