空气动力学学报2019，Vol.37Issue(1)：107-114,8.DOI:10.7638/kqdlxxb-2018.0246
大跨度桥梁龙卷风荷载物理模拟的关键相似参数
Key similarity parameters in physical simulation of tornado-induced wind loads on long-span bridges
摘要
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.关键词
龙卷风/大跨度桥梁/风荷载/高宽比/涡流比Key words
tornado/long-span bridge/wind load/aspect ratio/swirl ratio分类
建筑与水利引用本文复制引用
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):107-114,8.基金项目
国家自然科学重大研究计划重点项目(91216202) （91216202）
