摘要
景观桥在设计时往往追求结构新颖、造型独特。由于体型复杂,不宜采用节段模型风洞试验对其气动力特性进行研究。以国内一座拟建的异形景观桥为工程背景,通过全桥刚性模型测压风洞试验测试并研究了带遮阳篷的变截面曲线主梁和带观景平台的变截面倾斜桥塔的气动力特性。结果表明,遮阳蓬和箱梁受到的气动力在大多数风向角下方向一致,并在正交风向附近达到最大值。裸塔柱在α=0°(顺塔柱倾斜方向来流)时阻力系数最大,裸塔柱上部和下部的最大升力系数分别发生在α=90°(横桥向来流)附近和α=140°附近。主梁和观景平台的气动干扰使塔柱局部的气动力系数减小。观景平台的顺桥向力系数和横桥向力系数分别在α=180°附近(逆塔柱倾斜方向来流)和α=110°附近取得最大值。
In the design of a landscape bridge,it always pursues a novel structure and a unique shape.Because of the complexity,it is not suitable to study the aerodynamic force characteristics of a special-shaped landscape bridge by a wind tunnel test on a sectional model.Taking a special-shaped landscape bridge in China as the engineering background,the aerodynamic force characteristics of the curved variable cross-section girder with awning and the inclined variable cross-section bridge tower with sightseeing platform were studied by a rigid model pressure measurement test of an overall bridge.The results show that the aerodynamic forces subjected to girder and awning are in the same direction at most incidence angles and reach the maximum near the orthogonal wind.The drag coefficient of single pylon reaches the maximum when α=0°(inclined direction of the pylon flow),and the maximum lift coefficient of the upper and lower part of the single pylon occurs aroundα=90°(cross bridge flow)and α=140°,respectively.Aerodynamic interference of the girder and the sightseeing platform reduce the local aerodynamic coefficient of the pylon.The aerodynamic force coefficients of the sightseeing platform along the bridge and across the bridge reach the maximum near α=180°(opposite inclined direction of the pylon flow)and α=110°,respectively.
作者
刘小兵
姜会民
赵煜程
杨群
LIU Xiaobing;JIANG Huimin;ZHAO Yucheng;YANG Qun(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;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第24期144-153,189,共11页
Journal of Vibration and Shock
基金
国家自然科学基金(52078313,52008273)
河北省自然科学基金(E2018210105,E2020210083)
河北省高等学校科学技术研究项目(ZD2019118)
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自主课题(ZZ2020-14)
河北省大型基础设施防灾减灾协同创新中心资助项目。
关键词
异形景观桥
气动力系数
全桥刚性模型
风洞试验
测压
气动干扰
special-shaped landscape bridge
aerodynamicforce coefficient
rigid model of overallbridge
wind tunnel test
pressure measurement
aerodynamic interference
