风偏角对方形断面结构驰振不稳定性影响  

Effect of yaw angle on the galloping instability of slender square structures

作　　者：马文勇 张璐 张晓斌 邓然然 MA Wenyong;ZHANG Lu;ZHANG Xiaobin;DENG Ranran(Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Jinhua Traffic Planning and Institute Company Limited,Jinhua 321000,China)

机构地区：[1]河北省风工程和风能利用工程技术创新中心,石家庄050043 [2]石家庄铁道大学土木工程学院,石家庄050043 [3]金华市交通规划设计院有限公司,浙江金华321000

出　　处：《振动与冲击》2021年第2期171-175,184,共6页Journal of Vibration and Shock

基　　金：河北省自然科学基金(E2017210107);河北省教育厅重点项目(ZD2018063)。

摘　　要：方形断面的细长结构广泛的应用在工程领域,其在特定风向角和特定的风速范围下会发生具有较大危害性的驰振,目前斜置或者斜风向作用下的细长方柱驰振不稳定性的规律尚不清楚。采用刚性模型测压风洞试验,通过对斜置方柱气动力的分析,讨论了风偏角对方柱气动力的影响,基于准定常假设,分析了考虑风偏角的方柱驰振不稳定性。结果表明:方形断面是典型的驰振不稳定断面形状;随着来流与柱体轴向夹角的变小,方形断面的驰振不稳定区域增大,斜风向下的方柱更容易发生驰振,需要在类似结构抗风设计中引起重视。The onset of galloping for slender structures with square cross-section,which are widely used in engineering,may induce structural unsafety in particular wind directions.However,the galloping instability of skewed square cylinders,a kind of slender structures under wind with nonzero yaw angle is still unclear.In the present study,the aerodynamic forces were measured by wind pressure tests on the rigid sectional model in a wind tunnel.The effect of yaw angle on aerodynamic forces was discussed.Meanwhile,the galloping instability of skewed square cylinders was analyzed based on the quasi-steady assumption.The results show that the galloping may occur on square cylinders.Its unstable region increases with the decrease of the angle between the wind direction and the axis of the cylinder.The skewed square cylinder is more likely to encounter galloping.This tendency should be considered in designing slender square structures.

关 键 词：斜置方柱 风洞试验 风偏角 气动力 驰振不稳定性 

分 类 号：TU311.3[建筑科学—结构工程] O351.1[理学—流体力学]