Quantifying the impact of bridge geometry and surrounding terrain: wind effects on bridges

Yuxiang Zhang, Conor Sweeney, P. Cardiff, Fergal Cahill, J. Keenahan
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Abstract

The safety and serviceability of long-span bridges can be significantly impacted by wind effects and therefore it is crucial to accurately estimate them during bridge design. This study develops full-scale 3-Dimensional CFD (computational fluid dynamics) simulation models to replicate wind conditions at the Rose Fitzgerald Kennedy Bridge in Ireland. The neglection of bridge geometries and the use of small scales in previous studies are significant limitations, and both the bridge geometry and surrounding terrain are included here at full-scale. Input values for wind conditions are mapped from weather simulations that apply the Weather Research and Forecasting (WRF) model. Wind velocities at four different points calculated by CFD simulations are compared with corresponding data collected from SHM field measurements. The calculated time-averaged wind velocities at four different locations on the bridge are shown to have relative differences of less than 10% to the measured wind velocities by anemometers 90% of the time. The maximum relative difference among all comparisons was only 15%, shown to be partially due to the inclusion of the full bridge and terrain geometry.
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量化桥梁几何形状和周围地形的影响:风对桥梁的影响
大跨度桥梁的安全性和使用寿命受到风效应的显著影响,因此在桥梁设计中对风效应进行准确的评估是至关重要的。本研究开发了全尺寸三维CFD(计算流体动力学)模拟模型,以复制爱尔兰罗斯菲茨杰拉德肯尼迪大桥的风况。在以往的研究中,忽略了桥梁的几何形状和使用小比例尺是显著的局限性,在这里,桥梁的几何形状和周围的地形都是全尺寸的。风况的输入值是根据应用天气研究与预报(WRF)模式的天气模拟绘制的。将CFD模拟计算的4个不同点的风速与SHM现场实测数据进行了比较。在桥上四个不同位置计算的时间平均风速与风速计测量的风速的相对差异在90%的时间内小于10%。所有比较的最大相对差异仅为15%,部分原因是包含了完整的桥梁和地形几何。
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来源期刊
CiteScore
3.00
自引率
10.00%
发文量
48
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