摘要
通过风洞测振和测力试验,研究了不同上、下层梁间距及不同风攻角下,双层П型梁斜拉桥的涡振性能以及不同上、下层梁间距对双层П型梁断面三分力系数变化规律的影响。结果表明,双层П型梁的竖弯涡振振幅随着上、下层梁间距的增大呈现出先减小后增大的趋势,在上、下层梁间距为两倍梁高时降到最低;相较于0°风攻角,双层П型梁在+3°风攻角时涡振较为严重,而在-3°风攻角时则较为轻微;双层П型梁的升力系数较单层П型梁时有所降低,而阻力系数和力矩系数较单层П型梁时有所提高。
Through wind tunnel vibration and force measurement test,not only the vortex-induced vibration performance of double deck typeП-cross section under different beam spacing and wind attack angles,but also the change of three-component coefficients of double deckП-cross section with different beam spacing are studied.The results show that with the increase of beam spacing,the vortex-induced vibration amplitude of double deckП-cross section presents a trend of decreasing first and then increasing,and lowers to the minimum when beam spacing is twice of the beam height.Besides,it is relatively severe for the vibration resistance performance of double deckП-cross section when the wind attack angle is+3°,and is relatively better when the wind attack angle is-3°.The lift coefficient of double deckП-cross section is lower than that of single deckП-cross section,but the drag coefficient and moment coefficient of double deckП-cross section are higher than those of single deckП-cross section.
作者
李加武
霍五星
张耀
宋特
刘岩
LI Jia-wu;HUO Wu-xing;ZHANG Yao;SONG Te;LIU Yan(Wind Tunnel Laboratory,Chang’an University,Xi’an 710064,China)
出处
《公路》
北大核心
2020年第9期78-83,共6页
Highway
关键词
双层П型梁
涡振性能
三分力系数
梁间距
风攻角
double deckП-girder
vortex-induced vibration performance
three-component coefficient
beam spacing
wind attack angle
