摘要
对某大跨度钢桁悬索桥进行颤振试验研究,讨论采取设置中央稳定板、增设抑流板、封闭外护栏部分高度、调整下检修道人行板厚度以及变动水槽等不同气动措施及其相互组合下加劲梁的颤振稳定性能,综合考虑各方面因素得到气动优化方案。研究结果表明:单独采取设置下中央稳定板以及增设抑流板的措施对加劲梁的气动优化效果均不明显。在含有降低下检修道人行板厚度的组合措施中,保留水槽有利于改善加劲梁的颤振稳定性;在不含降低下检修道人行板厚度的组合措施中,移除水槽有利于改善加劲梁的颤振稳定性。外护栏的封闭高度越大,越有利于改善加劲梁的颤振稳定性,且封闭外护栏上部比封闭其下部的影响效果更明显。
An experimental investigation on a long-span steel truss suspension bridge was carried out in this paper.Based on the wind tunnel test results,the effects of different aerodynamic measures,such as setting up the central stabilizing plates,adding the flow suppression plate,sealing partial outer guardrail,adjusting the thickness of pedestrian slab of lower access road,and their combinations on the flutter stability of the main girder were discussed.The aerodynamic optimization scheme was determined by considering various factors.The results show that the improvement of flutter stability is not significant when only setting the lower central stabilizer plate or adding the flow suppression plate alone.In the combined measures to reduce the thickness of pedestrian slab of lower access road,retaining the water channel is beneficial to improve the flutter stability of the stiffened beam.However,in the combined measures without reducing the thickness of the pedestrian slab of the lower access road,the removal of the flume is beneficial to improve the flutter stability of the stiffened beam.The higher the enclosed height of the outer guardrail is,the more beneficial it is to improve the flutter stability.And it is better to close the upper part of the outer guardrail than to close the lower part.
作者
董国朝
许育升
韩艳
李凯
彭元诚
DONG Guochao;XU Yusheng;HAN Yan;LI Kai;PENG Yuancheng(School of Civil Engineering,Key Laboratory for Safety Control of Bridge Engineering,Ministry of Education and Hunan Province,Changsha 410114,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第4期949-956,共8页
Journal of Railway Science and Engineering
基金
国家自然科学基金优秀青年基金资助项目(51822803)
湖南省杰出青年基金资助项目(2018JJ1027)
湖南省教育厅优秀青年基金资助项目(16B011)
湖南省研究生科研创新资助项目(CX20200848)。
关键词
大跨度钢桁悬索桥
颤振稳定性
节段模型
气动优化
long-span steel truss suspension bridge
flutter stability
segment model
aerodynamic optimization
