大跨桥梁台风风场全过程动态数值模拟  

Numerical simulation on the whole dynamic process of a typhoon field passing through a long span bridge

作　　者：武隽[1] 刘焕举 黄平明[1] 韩万水[1] 刘晓东 WU Jun;LIU Huanju;HUANG Pingming;HAN Wanshui;LIU Xiaodong(Highway School,Chang’an University,Xi’an 710064,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]长安大学公路学院,西安710064 [2]河北工程大学土木工程学院,河北邯郸056038

出　　处：《振动与冲击》2019年第14期260-266,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金青年基金项目(51408053);中央高校基本科研业务费自然科学类项目(310821171002;310821162008;300102219220);中国博士后特别资助(国家级)项目(2015T80996)

摘　　要：从风速和风向两个角度对台风经过桥梁区域全过程的三维风场进行动态模拟。基于Batts模型、台风衰减模型及风剖面规律对时变平均风速进行模拟,采用进化谱理念改进谐波合成法对脉动风速进行模拟,构建台风风速动态模拟方法。依据桥梁节点与衰减风场的位置关系,动态确定桥梁各节点任意时刻时变风向,构建大跨桥梁台风风向全过程动态模拟方法。以一座典型斜拉桥为例,研究了大跨桥梁台风风场全过程模拟方法的适用性。结果表明:建立的模拟方法可考虑台风非平稳、强度衰减和风向时变,适用于大跨桥梁台风风场模拟;台风经过桥梁时段,各节点上的风力方向经历了可达180°的显著的变化,各节点风向不同,且均具有时变性;桥梁整体所受风向经历了由集中于主梁一侧到使桥梁转动的环流风向再到集中于主梁另一侧的连续变化。The whole dynamic process of a typhoon field passing through a bridge was simulated in the aspects of speed and direction.Based on the Batts model,typhoon attenuation model and regularity of wind profile,the time-varying mean speed of the typhoon was simulated.The harmonic synthesis method was improved in terms of evolutionary spectrum to simulate the fluctuating speed,and a dynamic simulation method for typhoon speed was constructed.According to the geometric relationship between bridge nodes and the attenuated typhoon field,the time-varying wind directions at bridge nodes were determined,and a dynamic simulation method for wind direction was built.Taking a typical cable-stayed bridge as an example,the applicability of the whole process simulation method for the typhoon field around the long-span bridge was studied.The results show that the established simulation method can take into account the non-stationary property,intensity attenuation and direction variation of the typhoon,and can be applied to the simulation of typhoon field around the long span bridge;during the period when the typhoon passes through the bridge,the wind direction at each node experiences remarkable change which can even reach 180 degree.The wind direction at each node is different and time-varying;and the wind direction experienced by the bridge undergoes a continuous change from the one side of the main beam to a circulation that makes the main beam rotate and finally to the other side.

关 键 词：台风 数值模拟 动态全过程模拟 时变风向 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]