开口叠合梁断面气动性能的试验研究

发布时间：2018-03-02 03:03

本文关键词： 钢-混叠合梁气动性能颤振涡振有限元法风洞试验风嘴　出处：《桥梁建设》2017年01期 　论文类型：期刊论文

【摘要】：钢-混叠合梁开口断面由于其外形的钝体特征,易出现气动稳定性问题,为了有效抑制开口断面的颤振和涡振,对其断面外形进行优化,以4座采用钢-混叠合梁开口断面的桥梁(鄱阳湖大桥和香溪河大桥为双塔斜拉桥,鳌江四桥为独塔斜拉桥,鹦鹉洲长江大桥为三塔悬索桥)为例,通过有限元计算和节段模型风洞试验研究其动力特性,分析开口断面的颤振性能和涡振性能,并寻找合理有效的抑振措施。结果表明:增加风嘴可以显著提高断面的颤振稳定性;下表面增设稳定板可以显著提高颤振临界风速;增加风嘴可以有效抑制开口断面的涡振,增大风嘴结构尺寸后抑振效果更加明显,开口断面增设挑梁结构可以显著改善涡振稳定性。
[Abstract]:The aerodynamic stability of open section of steel-mixed composite beam is easy to occur because of its obtuse body characteristics. In order to effectively suppress the flutter and vortex vibration of the open section, the profile of the section is optimized. Take four bridges with open section of steel-mixed composite beams (Poyang Lake Bridge and Xiangxi River Bridge as double-tower cable-stayed bridge, Aojiang fourth bridge as single-tower cable-stayed bridge, Parrot River Yangtze River Bridge as three-tower suspension bridge) as an example. Through finite element calculation and segmental model wind tunnel test to study its dynamic characteristics, the flutter performance and vortex vibration performance of open section are analyzed. The results show that the flutter stability of the section can be significantly improved by increasing the wind nozzle, the critical flutter velocity can be significantly increased by adding a stabilizer on the lower surface, and the vortex vibration of the open section can be effectively restrained by increasing the wind nozzle. The effect of vibration suppression is more obvious when the size of wind nozzle is increased, and the stability of vortex vibration can be significantly improved by adding cantilever beam structure to the open section.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金重大研究计划集成项目(91215302) 国家重点基础研究发展计划(973计划)项目(2013CB036300)~~
【分类号】：U446.1

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