大跨桥梁钢主梁抗风性能的高效计算方法研究  

EFFICIENT COMPUTATIONAL METHOD FOR AERODYNAMICS OF STEEL GIRDER OF LONG SPAN BRIDGE

作　　者：栗怀广[1] 郑凯锋[1] 苟超[1] 

机构地区：[1]西南交通大学,成都610031

出　　处：《钢结构》2011年第2期1-5,共5页Steel Construction

摘　　要：大跨度钢桥结构体系比较轻柔,容易产生风致振动和疲劳破坏,因此设计过程中需要研究其主梁的抗风性能。提出了一种新的基于分子运动论的桥梁风工程数值模拟方法:格子玻尔兹曼方法,通过计算分布在均匀流场格点上的分布函数来计算流场的宏观运动规律。为解决风工程中流动雷诺数较高的问题,引入了多弛豫碰撞模型。最后应用该方法研究了不同形式钢主梁的抗风性能。Long span steel bridges are susceptible to wind induced vibrations and subsequent fatigue degradation due to their flexible structural characteristics.Thus it is imperative to evaluate the aerodynamical behaviors of main steel girder during design phase.A new Lattice Boltzmann method based on kinetic theory is proposed for bridge wind engineering.The flow patterns around bridge can be computed efficiently with the calculation of density function on uniform lattice sites.Multi relaxation time collision model is employed to deal with the high Renolds number flows.According to some preliminary computational results of aerodynamics for different types of bridge decks,the efficiency,precision and stability of this method is justified.

关 键 词：大跨度 钢梁 格子玻尔兹曼方法 

分 类 号：U442[建筑科学—桥梁与隧道工程]