湖南大学学报（自然科学版）2025，Vol.52Issue(5)：88-98,11.DOI:10.16339/j.cnki.hdxbzkb.2025050
双边箱式Π型梁的抖振力展向相关性的试验研究
Experimental Study on Buffeting Force Spanwise Correlation of Bluff Double-side Box Girders
摘要
Abstract
A Π-shaped girder is the most commonly used in medium-span cable-stayed bridges.However,there are few studies on the buffeting force spanwise correlation of Π-shaped girders.To improve the accuracy of the buffeting calculation of Π-shaped girders,research was conducted on the buffeting force spanwise correlation.In this study,the section models of bluff double-side box girders(BDSBG)with three aspect ratios(B/H=5,10 and 15)were made.Then,in the two grid turbulent flow fields and the signature turbulence caused by uniform airflow,the pressure-measured tests were performed to measure the wind pressure time-history of each pressure tap,which was used to calculate the buffeting forces and their power spectra,spanwise cross-correlation coefficients,and spanwise coherence functions.Moreover,the effects of B/H and flow fields on the power spectrum and spanwise correlation of the buffeting forces of BDSBG were studied.The results show that:1)with the increase of B/H,the energy of the buffeting forces gradually decreases;the higher the turbulence intensity of the flow field,the more energy is provided to the buffeting forces;moreover,the influence of the vortex shedding frequency on the buffeting force power spectrum can be greatly weakened by the grid turbulent flow-field.2)with the increase of B/H,both the spanwise correlation and coherence of the buffeting forces increase;these values are much greater than those of the fluctuating wind,and the difference in the spanwise correlation and coherence between the buffeting forces and the fluctuating wind also increases with the increase of B/H;furthermore,with the increase of the turbulence intensity,the buffeting force spanwise correlation increases,while both the discreteness of the buffeting force spanwise coherence and the influence of the vortex shedding frequency on the buffeting force spanwise coherence decreases.关键词
双边箱式Π型梁/宽高比/抖振力/功率谱/展向相关性/风洞试验Key words
bluff double-side box girder/aspect ratio/buffeting force/power spectrum/spanwise correlation/wind tunnel test分类
交通运输引用本文复制引用
李宇,冯朴,陈哲,李加武..双边箱式Π型梁的抖振力展向相关性的试验研究[J].湖南大学学报（自然科学版）,2025,52(5):88-98,11.基金项目
国家重点研发计划资助项目(2021YFB1600300),National Key Research and Development Program of China(2021YFB1600300) （2021YFB1600300）
国家自然科学基金资助项目(51978077),National Natural Science Foundation of China(51978077) （51978077）
陕西省自然科学基础研究计划资助项目(2023-JC-YB-438),Natural Science Basic Research Program of Shaanxi(2023-JC-YB-438) （2023-JC-YB-438）
