基于拉格朗日体系的典型桥梁断面风-雨耦合作用数值模拟
发布时间：2018-08-27 06:03
【摘要】：对典型桥梁断面风-雨耦合作用下的静三分力进行了CFD(Computational Fluid Dynamics)数值模拟研究.对计算流体动力学软件进行二次开发,采用DPM(Discrete Phase Model)模型结合UDF(User Defined Function)函数施加源项的方法来研究风-雨耦合作用对桥梁断面静三分力系数的影响.将空气作为连续相通过欧拉法求解,采用基于拉格朗日体系的离散相模型对雨滴运动轨迹进行求解,引入离散随机游走模型来考虑旋涡对雨滴运动的影响,并通过冲量定理得到风-雨耦合下的雨滴对主梁断面的冲击载荷.通过与文献结果比较来验证方法的正确性,然后研究了风-雨耦合作用对典型桥梁断面三分力系数的影响,以及三维风-雨耦合作用对典型桥梁断面的作用机理,为研究桥梁风-雨耦合荷载提供了基础理论方法.
[Abstract]:The static three-point force of typical bridge section under the coupling of wind and rain is numerically simulated by CFD (Computational Fluid Dynamics). Based on the secondary development of computational fluid dynamics (CFD) software, the influence of wind-rain coupling on the static three-point force coefficient of bridge section is studied by using DPM (Discrete Phase Model) model and UDF (User Defined Function) function to apply source term. The air as a continuous phase is solved by Euler method. The discrete phase model based on Lagrange system is used to solve the track of raindrop motion. The discrete random walk model is introduced to consider the effect of vortex on the motion of raindrop. The impact load of raindrops on the cross section of the main beam is obtained by the impulse theorem under the coupling of wind and rain. The validity of the method is verified by comparing with the results of literature. Then the influence of the wind rain coupling on the three-point force coefficient of typical bridge section and the action mechanism of three dimensional wind rain coupling action on typical bridge section are studied. It provides a basic theoretical method for the study of wind-rain coupling loads of bridges.
【作者单位】： 长沙理工大学桥梁工程安全控制省部共建教育部重点实验室;路易斯安娜州立大学土木与环境工程系;
【基金】：国家自然科学基金资助项目(51408061) 国家重点基础研究计划(973计划)项目(2015CB057706)~~
【分类号】：U441.3
[Abstract]:The static three-point force of typical bridge section under the coupling of wind and rain is numerically simulated by CFD (Computational Fluid Dynamics). Based on the secondary development of computational fluid dynamics (CFD) software, the influence of wind-rain coupling on the static three-point force coefficient of bridge section is studied by using DPM (Discrete Phase Model) model and UDF (User Defined Function) function to apply source term. The air as a continuous phase is solved by Euler method. The discrete phase model based on Lagrange system is used to solve the track of raindrop motion. The discrete random walk model is introduced to consider the effect of vortex on the motion of raindrop. The impact load of raindrops on the cross section of the main beam is obtained by the impulse theorem under the coupling of wind and rain. The validity of the method is verified by comparing with the results of literature. Then the influence of the wind rain coupling on the three-point force coefficient of typical bridge section and the action mechanism of three dimensional wind rain coupling action on typical bridge section are studied. It provides a basic theoretical method for the study of wind-rain coupling loads of bridges.
【作者单位】： 长沙理工大学桥梁工程安全控制省部共建教育部重点实验室;路易斯安娜州立大学土木与环境工程系;
【基金】：国家自然科学基金资助项目(51408061) 国家重点基础研究计划(973计划)项目(2015CB057706)~~
【分类号】：U441.3
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