山区峡谷大跨度人行悬索桥抗风性能试验研究  

Experimental Study on Wind-Resistant Performance of Long-Span Pedestrian Suspension Bridge over Ravine in Mountainous Area

作　　者：刘小兵 姜会民 赵煜程 杨群 陈思甜[3] LIU Xiao-bing;JIANG Hui-min;ZHAO Yu-cheng;YANG Qun;CHEN Si-tian(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;School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074,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,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043 [3]重庆交通大学土木工程学院,重庆400074

出　　处：《世界桥梁》2022年第2期57-63,共7页World Bridges

基　　金：国家自然科学基金项目(52078313,52008273);河北省自然科学基金项目(E2020210083)。

摘　　要：为研究山区峡谷大跨度人行悬索桥的抗风性能,以一座跨度为389 m的人行悬索桥为背景开展风洞试验研究。首先采用地形模型风洞试验获得加劲梁设计基准风速、静阵风风速和颤振检验风速;然后采用节段模型测力风洞试验测得加劲梁气动力系数随风攻角的变化规律,采用节段模型测振风洞试验测得加劲梁在风荷载作用下的竖向位移根方差及扭转角根方差,以分析加劲梁的涡振特性和颤振稳定性。结果表明:随着风攻角由-10°变化到10°,加劲梁的阻力系数先减小后增大,升力系数明显增大,扭矩系数缓慢增大;加劲梁在+3°和+5°风攻角下均发生了扭转涡振和软颤振现象,但涡振的起始风速均大于设计基准风速,颤振临界风速均大于颤振检验风速,表明该桥具有较好的涡振性能和颤振稳定性。Based on a pedestrian suspension bridge with a main span of 389 m,wind tunnel tests were conducted to study the wind-resistant performance of long-span pedestrian suspension bridges over ravines in the mountainous area.Firstly,the wind tunnel test of a terrain model was performed to obtain the design reference wind speed,static gust wind speed and flutter checking wind speed of the stiffening girder.Then,the wind tunnel test of a sectional model was carried out to investigate the relationship between aerodynamic coefficient of stiffening girder and the variation of wind attack angles.The root mean square errors of vertical displacement and torsional angles of the stiffening girder under the action of wind loads were figured out to analyze the characteristics of the vortex-induced vibration and flutter stability of the stiffening girder.It is shown that as the wind attack angle changed from-10°to 10°,the drag coefficient of the stiffening girder initially dropped,but then again increased,the lift coefficient was significantly augmented,while the torsional coefficient was scaled up slowly.When the wind attack angles were at+3°and+5°,both torsional vortex-induced vibration and soft flutters were observed on the stiffening girder,but the critical wind speeds of vortex-induced vibration were faster than the design reference wind speed,the critical flutter wind speeds were faster than the flutter checking wind speed,proving that the pedestrian bridge has sound resistance to vortex-induced vibration and flutter stability.

关 键 词：人行桥 悬索桥 山区峡谷 抗风性能 气动力系数 涡振 颤振 风洞试验 

分 类 号：U448.11[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]