不同护栏透风率下桥面雪飘移的数值模拟  

CFD SIMULATION OF SNOW DRIFTING AROUND BRIDGE DECK WITH DIFFERENT BARRIER POROSITIES

作　　者：张天歌 周晅毅[1] 顾明[1] ZHANG Tian-ge;ZHOU Xuan-yi;GU Ming(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《工程力学》2023年第3期36-43,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(52078380);科技部国家重点实验室基金项目(SLDRCE19-B-14)。

摘　　要：采用计算流体动力学(Computational Fluid Dynamics,CFD)方法,对典型桥梁断面上的雪飘移进行了数值模拟,得到桥面上风致积雪的重分布。为验证该文数值模拟方法的正确性,以平屋面风吹雪为案例,将该文数值模拟方法得到的结果与风洞试验结果进行了对比。在桥面雪飘移的数值模拟过程中,考虑了桥梁护栏的影响,对比分析了不同护栏透风率下桥面风致积雪重分布形式。研究发现:当护栏透风率大于50%时,桥面上不会出现显著的积雪沉积;当护栏透风率小于50%时,桥面护栏附近出现了较显著的积雪沉积,且在迎风端护栏的背风侧沉积最大。为减小桥面风致积雪堆积对交通的不利影响,建议在桥梁设计时采用高透风率的护栏。Snow drifting around a typical bridge deck was simulated using computational fluid dynamics(CFD)method to attain the snow redistribution on the bridge deck.To verify the accuracy of the numerical model,snow drifting around a flat roof was firstly simulated.The result of the numerical simulation was compared with that of wind tunnel tests.In the simulation of snow drifting around the bridge deck,the barriers on a bridge deck were considered and snow redistributions on the bridge deck with different barrier porosities were analyzed.It is shown that when the barrier porosity is above 50%,snow could not be accumulated heavily on the bridge deck.When the barrier porosity is below 50%,snowdrift would be accumulated next to the barriers,and snow is accumulated significantly behind the windward barrier.Therefore,to mitigate the effect of wind-induced snow accumulation on a bridge deck on traffic,it is suggested that the barrier with high porosity should be used in the design of the bridge.

关 键 词：计算流体动力学(CFD) 雪飘移 积雪重分布 桥梁结构 护栏 

分 类 号：TU312.1[建筑科学—结构工程]