铁道标准设计2025，Vol.69Issue(4)：102-109,118,9.DOI:10.13238/j.issn.1004-2954.202307120001
公轨并行桥梁横风作用下桥面列车和车桥系统气动特性研究
Aerodynamic Characteristics of Trains on Bridge Deck and Train-Bridge System for Road-Rail Bridge Under Crosswinds
摘要
Abstract
This study aims to investigate the aerodynamic characteristics of the train on bridge deck and the train-bridge system of long-span road-rail bridges under crosswinds.Taking a specific long-span road-rail cable-stayed bridge as an example,a sectional model wind tunnel test method was employed to conduct wind pressure tests on the train on bridge deck and aerostatic force tests on the train-bridge system.Additionally,the numerical simulation technology of the computational fluid dynamics(CFD)was applied to analyze the flow field distribution of the train-bridge system.The results from train pressure measurements and CFD simulation showed that under the conditions of uniform incoming flow,the windward side of a single train or the leading train of double trains formed a positive pressure zone,while the top and the leeward side surfaces formed negative pressure zones.The entire surface of the trailing train in double trains was under negative pressure.The CFD simulation flow field revealed alternating vortex shedding downstream of the main girder.By calculating the aerostatic force coefficients based on train pressure measurements,it was found that under crosswinds,the drag and lift coefficients of the windward train were relatively high,while the torque coefficient was low.As the wind attack angle changed from negative to positive,the drag and lift coefficients gradually decreased.In the case of double trains,the trailing train had a minimal effect on the leading train,while the leading train significantly shielded the trailing train,resulting in negative aerodynamic forces on the trailing train.When the train moved away from the windward side of the main girder,the drag and lift coefficients of the train decreased gradually,thereby improving train's operational safety.However,the overall train-bridge system experienced an increase in drag and lift coefficients,adversely affecting the wind resistance performance of the main girder.Based on the research findings,it is recommended to position train tracks closer to the central line of the main girder in the design of road-rail bridges to ensure train operation stability and the wind resistance safety of the main girder.This study offers precise aerodynamic performance data,contributing to a better understanding of the behavior of road-rail bridges under crosswinds and providing references for their design and improvement.关键词
公轨并行桥/车桥系统/风洞试验/气动特性/三分力系数Key words
road-rail bridge/train-bridge system/wind tunnel test/aerodynamic characteristics/aerostatic coefficients分类
交通工程引用本文复制引用
邓佳逸,陈诗璇,吴庆,漆勇,封周权,华旭刚..公轨并行桥梁横风作用下桥面列车和车桥系统气动特性研究[J].铁道标准设计,2025,69(4):102-109,118,9.基金项目
湖南省自然科学基金项目(2021JJ30106) （2021JJ30106）
重庆市自然科学基金项目(2022NSCQ-MSX5727) （2022NSCQ-MSX5727）
