摘要
板桁主梁以其良好的整体性和合理的受力性能广泛应用于铁路桥梁建设中,随着桥梁跨径的增大,其抗风性能已逐渐成为控制桥梁设计的关键因素之一。基于桁架受风面积等效,并考虑上流、下流构件间相互的气动干扰,提出了一种简化的CFD分析模型,该模型偏安全地忽略了腹杆和上弦杆、下弦杆连接处相互的气动作用,将三维板桁主梁等效为二维平面结构,从而降低建模难度和减小计算工作量。基于该简化CFD分析模型,对倒梯形板桁主梁的静力气动力系数、涡振性能、颤振导数进行了计算分析,并对比了桥上车辆存在对板桁主梁的气动特性的影响。研究结果表明,倒梯形板桁主梁的涡振性能对雷诺数较为敏感,桥上车辆的存在显著改变了板桁主梁的气动特性。
With its good properties of integrity and reasonable mechanics,the plate-truss deck is gradually widely used in the construction of railway bridges.But its wind-resistant capability becomes one of the important factors controlling the bridge design with the increasing of a bridge span.A simplified CFD modal was presented by the basis of the equivalent trusses area acted by wind.The modal fully consider the aerodynamic interference between the structural members at windward and leeward sides.The modal neglects the aerodynamic interference at the junction of top chords,bottom chords and web members.The three-dimensional plate-truss deck is simplified into a two-dimensional cross section,which can reduce the modeling difficulty and calculation work.The static aerodynamic coefficients,vortex-vibration performance and flutter derivatives of the inverted trapezoidal plate-truss deck are simulated.The influence of train existing on the deck is investigated.The research results show that vortex vibration performance of the inverted trapezoidal plate-truss deck is more sensitive to the Reynolds number,and the existence of the train can significantly changes the aerodynamic characteristics of the plate-truss deck.
出处
《工程力学》
EI
CSCD
北大核心
2011年第A01期103-109,共7页
Engineering Mechanics
基金
国家自然科学基金项目(50508036)
教育部新世纪优秀人才支持计划项目(NCET-06-0802)
四川省杰出青年学科带头人计划项目(2009-15-406)
关键词
板桁主梁
气动特性
CFD
简化模型
铁路桥梁
plate-truss deck
aerodynamic characteristics
CFD
simplified model
railway bridg
