大跨桥梁钢主梁抗风性能的高效计算方法研究.pdf

文档介绍：栗怀广,等:大跨桥梁钢主梁抗风性能的高效计算方法研究
大跨桥梁钢主梁抗风性能的
高效计算方法研究
栗怀广郑凯锋苟超

西南交通大学成都
( , 610031)
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。
关键词:大跨度;钢梁;格子玻尔兹曼方法
PUTATIONAL METHOD FOR AERODYNAMICS
OF STEEL GIRDER OF LONG SPAN BRIDGE
Li Huaiguang Zheng Kaifeng Gou Chao
(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
ABSTRACT:Long span steel bridges are susceptible to wind induced vibrations and subsequent fatigue degradation
due to their flexible structural it is imperative to evaluate the aerodynamical behaviors of main
steel girder during design new Lattice Boltzmann method based on ic theory is proposed for bridge
wind flow patterns around bridge can puted efficiently with the calculation of density
function on uniform lattice relaxation time collision model is employed to deal with the high Renolds
number to some putational results of aerodynamics for different types of bridge
decks,the efficiency,precision and stability of this method is justified.
KEY WORDS:long span;steel beam;Lattice Boltzmann method
大跨桥梁结构比较轻柔结构行为特征不同于格子玻尔兹曼方法
, 1
短跨桥梁其工程建设面临着诸多技术挑战其中最格子玻尔兹曼方法
, , (LBM,Lattice Boltzmann
为关键的是设计