Interference Effect on Stationary Aerodynamic Performance between Parallel Bridges
Interference Effect on Stationary Aerodynamic Performance between Parallel Bridges
复制标题
平行桥间静止气动性能的干扰效应
DOI：
10.1142/s0219455417500171
复制
发表时间：
2017-03
影响因子：
3.6
通讯作者：
葛耀君
中科院分区：
文献类型：
--
作者：
周锐;杨詠昕;Lihai Zhang;葛耀君
在运营阶段，由于荷载分布不均等特殊情况，平行桥梁可能会变为不平行。气动性能在非平行位置下会发生显著变化，并与平行位置下的气动性能有所不同。本文通过一系列风洞试验，研究了两平行桥梁在运营阶段不同非平行位置下的静力气动性能。这包括两个水平间隙距离（HGD），五个相对垂直位移（RVD）和五个相对扭转位移（RTD）的调查。首先，对两个封闭箱梁的截面模型进行了平稳流中的定常气动力系数试验。采用优化迭代法计算了两座悬索桥在定常气动力作用下的结构位移和扭转发散临界风速。研究结果表明，定常气动力系数的变化取决于两梁的相对位移和风攻角。此外，研究还表明，干扰效应对两座具有较大间隙宽度比（即D/B = 1）的桥梁的稳态气动失稳是不利的，这与主梁和桥梁结构的气动形状有关。当背风桥的垂直位置高于迎风桥时，背风桥的Ucr显著下降。最重要的是，它表明RVD和RTD的组合（例如RVD =− 20 mm和RTD =−2 mm）可能会导致迎风和背风桥梁的Ucr分别降低12.03%和7.89%，从而导致最差的静态气动性能。
During the operation stage, parallel bridges may become nonparallel as a result of unequal load distribution between two parallel bridges and other special conditions. Aerodynamic performance could change significantly under nonparallel positions and become different from that under parallel positions. In this paper, the stationary aerodynamic performance of two parallel bridges under various nonparallel positions during operation stage is studied through a series of wind tunnel tests. This includes the investigation of two horizontal gap distances (HGDs), five relative vertical displacements (RVD) and five relative torsional displacements (RTD). First, sectional models of two closed box girders were tested in smooth flow for stationary aerodynamic force coefficients. An optimum iteration method was then used to calculate the structural displacements and torsional divergence critical wind velocities (Ucr) of two assumed suspension bridges under stationary aerodynamic force. The research outcomes demonstrated that the changes of stationary aerodynamic force coefficients are dependent on the relative displacements of two girders and wind attack angles. In addition, it was revealed that interference effects are detrimental to stationary aerodynamic instability of two bridges with a larger gap-width ratio (i.e. D/B = 1), which is related to the aerodynamic shape of girders and bridge structures. Further, the Ucr of the leeward bridge significantly decline when the vertical position of the leeward bridge become higher that of the windward bridge. Most importantly, it showed that the combination of RVD and RTD (e.g. RVD =−20mm and RTD =−2∘) could potentially lead to the worst stationary aerodynamic performance by decreasing Ucr of the windward and leeward bridge with 12.03% and 7.89%, respectively.
登录
查看更多内容
DOI：
10.12989/imm.2008.1.3.381
发表时间：
2008-09
期刊：
Interaction and multiscale mechanics
影响因子：
--
作者：
Yeong-Bin Yang;J. Tsay
通讯作者：
Yeong-Bin Yang;J. Tsay
DOI：
10.1016/j.jweia.2007.06.021
发表时间：
2008-06
影响因子：
4.8
作者：
K. Kimura;K. Shima;K. Sano;Y. Kubo;Kusuo Kato;H. Ukon
通讯作者：
K. Kimura;K. Shima;K. Sano;Y. Kubo;Kusuo Kato;H. Ukon
大跨三塔悬索桥颤振稳定性参数敏感性研究
DOI：
10.1016/j.jweia.2014.03.004
发表时间：
2014-05
影响因子：
4.8
作者：
Hao Wang;Tianyou Tao;Rui Zhou;Xugang Hua;Ahsan Kareem
通讯作者：
Ahsan Kareem
DOI：
10.1016/j.jweia.2013.01.014
发表时间：
2013-05
影响因子：
4.8
作者：
Juwon Seo;Ho-Kyung Kim;J. Park;Kwon-Taek Kim;G. Kim
通讯作者：
Juwon Seo;Ho-Kyung Kim;J. Park;Kwon-Taek Kim;G. Kim
DOI：
10.1142/s0219455411004002
发表时间：
2011-11
影响因子：
3.6
作者：
Chern‐Hwa Chen;C. Ou
通讯作者：
Chern‐Hwa Chen;C. Ou