铁道科学与工程学报2016，Vol.13Issue(10)：1945-1954,10.
桥面栏杆对主梁气动力和涡脱特性的影响研究
Investigation on effects of deck rails on aerodynamics and vortex shedding pattern of bridge girders
摘要
Abstract
In order to evaluate the effects of deck rails on aerodynamics of bridge girders, CFD simulations were carried out to investigate flow field around girder of the Great Belt East Bridge main span, in both construction stage and in-service stage. The Reynolds-Averaged Navier-Stokes ( RANS) equation and SST k - ωturbulent model were employed,with Reynolds number of 3. 18 × 105 . Aerodynamic coefficients of the girder in two stage were obtained under different wind angles of attack. The mean pressure distribution around the girder surface and vortex-shedding Strouhal (St) number are also obtained. The results agrees well with available wind tunnel tests. It is found that the deck rails would bluff the bridge girder, and change pressure distribution on girder windward side. Compared with construction stage under the same wind angle of attack, the involved deck rails will result in significant increase on drag coefficients, with a maximum increase of 38% at zero angle of attack. Both the con-struction stage and in-service stage indicate a multiple vortex-shedding feature, with high-order vortex shedding dominated regardless of time step refinement in the former. Besides, low-order vortex shedding dominated can be predicted in the later if time step size is small enough. It is found that previous CFD simulations of girder in oper-ation stage without deck rails should be avoided, and aerodynamic design of crash barriers, different vortex-shedding features of girders between the construction stage and operation stage should be put great emphasis.关键词
大跨度桥梁/气动力/漩涡脱落/桥面栏杆/湍流模型Key words
long-span bridges/aerodynamics/vortex shedding/deck rails/turbulence modeling分类
交通工程引用本文复制引用
祝志文..桥面栏杆对主梁气动力和涡脱特性的影响研究[J].铁道科学与工程学报,2016,13(10):1945-1954,10.基金项目
国家重点基础研究发展计划(973计划)项目(2015CB057701,2015CB057702) （973计划）
国家自然科学基金资助项目(51278191) （51278191）
湖南省交通科技计划资助项目(201522) （201522）
