Based on a domestic wide-width double-box composite beam bridge, the aerodynamic characteristics and flow field mechanisms of wide-width double-box composite beams with different aspect ratios were investigated investigated,using a combined approach of wind tunnel test and numerical simulation in this study. Firstly, a total of eleven wind attack angles ranging from -10° to 10° with an interval of 2° were selected for the investigation under an aspect ratio of the actual bridge of 12.8. Subsequently, focusing on the 0° wind attack angle (horizontal flow direction), six different aspect ratios (9, 11, 12.8, 15, 17, and 19) were chosen for analysis, based on the range observed in practical engineering applications for double-box composite beams. The results indicate that, under the aspect ratio of the actual bridge, as the wind attack angle varies from -10° to 10°, the drag coefficient of the double-box composite beam initially first decreases and then increases; the direction of lift force changes from downward to upward, with the absolute value of the lift coefficient initially first decreasing and then increasing; the direction of torque changes from counterclockwise to clockwise, and the clockwise torque coefficient initially first increases and then decreases. At a wind attack angle of 0°, as the aspect ratio of the composite beam increases, the drag coefficient remains constant initially first and then increases; the direction of lift force changes from downward to upward, with the absolute value of the lift coefficient initially first decreasing and then increasing; and the torque coefficient gradually decreases. For the wide-width double-box composite beams with different aspect ratios under 0° wind attack angle, a calculation formula for the three-component force coefficient is was presented, which can provide a reference for the wind load design of wide-width double-box composite beams in practical engineering.
Key words
wide-width double-box composite beam /
wind tunnel test /
numerical simulation /
aerodynamic force characteristics /
flow field mechanism /
aspect ratios
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 陈政清. 桥梁风工程[M]. 北京: 人民交通出版社, 2005: 64-98.
CHEN Zhengqing. Wind engineering of bridge[M]. Beijing: China Communications Press, 2005: 64-98.
[2] 张天翼, 孙延国, 李明水, 等. 宽幅双箱叠合梁涡振性能及抑振措施试验研究[J]. 中国公路学报, 2019, 3210: 107-114+168.
ZHANG Tianyi, SUN Yanguo, LI Mingshui, et al. Experimental study on vertex-induced vibration performance and aerodynamic countermeasures for a wide-width double-box composite beam. China Journal of Highway and Transport, 2019, 3210: 107-114+168.
[3] 刘志文, 肖晗, 王雷, 等. Π型钢-混凝土结合梁断面涡激振动及气动控制措施[J]. 湖南大学学报(自然科学版), 2022, 4903: 68-78.
LIU Zhiwen, XIAO Han, WANG Lei, et al.Vortex-induced vibration of a ∏-shaped steel-concrete composite girder and its aerodynamic countermeasures [J]. Journal of Hunan University (Natural Science), 2022, 4903:68-78.
[4] Larsen A, Esdahl S, Andersen J E, et al. Storebelt suspension bridge-vortex shedding excitation and mitigation by guide vanes[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2000, 88(2/3): 283-296．
[5] Freire A M S, Negrao J H O, Lopes A V. Geometrical nonlinearities on the static analysis of highly flexible steel cable-stayed bridges[J]. Computers & Structures, 2006, 84(31/32): 2128-2140.
[6] Kubo Y, Sadashima K, Yamaguchi E, et al. Improvement of aeroelastic instability of shallow π section[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2001, 98(14/15): 1445-1457.
[7] 许福友, 丁威, 姜峰, 等. 大跨度桥梁涡激振动研究进展与展望[J]. 振动与冲击, 2010 , 2910: 40-49+249.
XU Fuyou, DING Wei, JIANG Feng, et al. Development and prospect of study on vortex-induced vibration of long-span bridges [J]. Journal of Vibration and Shock, 2010, 2910: 40-49+249.
[8] ZHOU R, GE Y, YANG Y, et al. Effects of vertical central stabilizers on nonlinear wind-induced stabilization of a closed-box girder suspension bridge with various aspect ratios[J]. Nonlinear Dynamics, 2023, 111(10): 9127-9143．
[9] 李加武, 林志兴, 项海帆. 扁平箱形桥梁断面静气动力系数雷诺数效应研究[J]. 公路, 2004, (09): 43-47.
LI Jiawu, LIN Zhixing, XIANG Haifan. A study on Reynolds Number effect of mean aerodynamic force coefficient of box-beam bridge deck sections[J]. Highway, 2004, (09): 43-47.
[10] 范佳豪, 刘慧杰, 姜会民, 等. 宽高比对扁平箱梁气动力特性的影响规律及流场机理研究[J]. 石家庄铁道大学学报(自然科学版), 2022, 35(03): 17-22+49.
FAN Jiahao, LIU Huijie, JIANG Huimin, et al. Influence rules of Width-Height ratios on aerodynamic force characteristics and flow field mechanisms of flat box girder[J]. Journal of Shijiazhuang Tiedao University(Natural Science), 2022, 35(03): 17-22+49.
[11] 李加武, 宋特, 林立华, 等. 变截面连续钢箱梁桥静气动性能研究[J]. 公路交通科技, 2020, 37(04): 88-95.
LI Jiawu, SONG Te, LIN Lihua, et al. Study on aerodynamic performance of a continuous steel box girder bridge with variable sections [J]. Journal of Highway and Transportation Research and Development, 2020, 37(04): 88-95.
[12] LI H, HE X, HU L, et al. Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model[J]. Advances in Structural Engineering, 2021, 24(10): 1-15．
[13] 公路桥梁抗风设计规范: JTG/T 3360-01—2018[S]. 北京: 人民交通出版社股份有限公司, 2018: 77-80.
Wind-resistant Design Specification for Highway Bridges: JTG/T 3360-01—2018[S]. Beijing: China Communications Press Co. Ltd., 2018: 77-80.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(3555 KB)
