Key similarity parameters in physical simulation of tornado-induced wind loads on long-span bridges

CAO Jinxin; REN Shaolan; CAO Shuyang; GE Yaojun

doi:10.7638/kqdlxxb-2018.0246

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Key similarity parameters in physical simulation of tornado-induced wind loads on long-span bridges

更新时间：2026-05-28

- Key similarity parameters in physical simulation of tornado-induced wind loads on long-span bridges
- Vol. 37, Issue 1, Pages: 107-114(2019)
- 作者机构：
  
  1. 土木工程防灾国家重点实验室,上海,200092
  2. 同济大学桥梁工程系,上海,200092
  3. 桥梁结构抗风技术交通运输行业重点实验室(同济大学),上海,200092
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2018.0246
  CLC： TU312+.1
- Published：2019
- 稿件说明：
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操金鑫, 任少岚, 曹曙阳, 葛耀君. 大跨度桥梁龙卷风荷载物理模拟的关键相似参数[J]. 空气动力学学报, 2019, 37(1): 107-114.

CAO Jinxin, REN Shaolan, CAO Shuyang, et al. Key similarity parameters in physical simulation of tornado-induced wind loads on long-span bridges[J]. 2019, 37(1): 107-114.
操金鑫, 任少岚, 曹曙阳, 葛耀君. 大跨度桥梁龙卷风荷载物理模拟的关键相似参数[J]. 空气动力学学报, 2019, 37(1): 107-114. DOI： 10.7638/kqdlxxb-2018.0246.

CAO Jinxin, REN Shaolan, CAO Shuyang, et al. Key similarity parameters in physical simulation of tornado-induced wind loads on long-span bridges[J]. 2019, 37(1): 107-114. DOI： 10.7638/kqdlxxb-2018.0246.

摘要

为识别大跨度桥梁主梁断面在龙卷风作用下的风荷载特性及其主要影响实验参数，在龙卷风风场特性模拟的基础上，基于龙卷风模拟装置和刚体模型测压实验方法，对流线型扁平钢箱主梁表面风压分布、断面三分力系数等风荷载特性进行了识别，并讨论了涡流比、高宽比等龙卷风相似参数对风荷载识别结果的影响。结果表明，桥梁主梁在模拟龙卷风作用下的风荷载特性与常规边界层风洞实验结果明显不同。高宽比对风荷载特性的影响程度远大于其对风场特性的影响。不同涡流比下，高宽比对风荷载特性的影响程度不同。高宽比和涡流比是影响桥梁主梁龙卷风荷载的关键相似参数。风荷载模拟结果及其关键相似参数的影响规律将为桥梁抗龙卷风设计提供基础气动参数数据。

Abstract

In order to identify tornado-induced wind load characteristics of long-span bridges and the main influencing experimental factors

surface pressure distributions over the deck as well as aerodynamic coefficients were determined through rigid model wind pressure measurements in a tornado vortex simulator. In the experiments

similarity parameters including swirl ratio and aspect ratio were considered. Significant differences are observed between experimental wind loads in the tornado vortex simulator and in the conventional boundary layer wind tunnel. The influence of aspect ratio on the tornado-induced wind loads is much greater than that on the tornadic wind fields

and the degree of the influence is dependent on swirl ratio. According to the results

aspect ratio and swirl ratio are two key similarity parameters in the determination of tornado-induced wind loads on long-span bridges. The experimental findings can provide basic aerodynamic coefficients for tornado-resistant designs on long-span bridges.

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references

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