摘要
为研究宽高比对扁平箱梁气动力特性的影响规律及流场机理,以国内某跨海大桥初步设计方案为背景,在7个风攻角下对4个不同宽高比的扁平箱梁进行了数值模拟研究,得到了扁平箱梁的三分力系数、风压系数和时均流线图。研究表明,扁平箱梁的阻力系数受宽高比的影响比升力系数和扭矩系数显著。宽高比的增加会使扁平箱梁受到的阻力减小,但会使其受到更大的升力和扭矩。不同宽高比下扁平箱梁所形成旋涡的位置基本相同,但大小和强度不同,这直接导致了扁平箱梁所受气动力的变化。
In order to study the influence of width-height ratios on aerodynamic force characteristics and flow field mechanism of flat box girder,the numerical simulation of four flat box girder with different width-height ratios was carried out at seven wind attack angles,and the three-component force coefficient,wind pressure coefficient and time-average flow diagram of flat box girder were obtained with the preliminary design of a cross-sea bridge as the research background.The results show that the drag coefficient of flat box girder is significantly affected by width-height ratios than lift coefficient and torque coefficient.With the increase of width-height ratios,the flat box girder will suffer less resistance,but more lift force and torque.The positions of vortices formed by flat box girders with different width-height ratios are basically the same,but their sizes and intensities are different,which directly lead to the changes of aerodynamic forces on flat box girders.
作者
范佳豪
刘慧杰
姜会民
刘小兵
杨群
Fan Jiahao;Liu Huijie;Jiang Huimin;Liu Xiaobing;Yang Qun(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《石家庄铁道大学学报（自然科学版）》
2022年第3期17-22,49,共7页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
国家自然科学基金(52008273,52078313)
河北省自然科学基金(E2020210083)
河北省高等学校科学技术研究项目(ZD2019118)。
关键词
扁平箱梁
宽高比
风攻角
三分力系数
风压系数
时均流线图
streamlined box girder
width-height ratio
wind attack angle
three-component force coefficient
wind pressure coefficient
time-mean flow diagram
