双幅钝体钢箱梁桥涡振性能气动优化风洞试验研究
Wind tunnel test study on aerodynamic optimization of vortex induced vibration performance of double bluff body steel box girder bridge
Received:April 23, 2021  Revised:May 28, 2021
DOI:10.7520/1001-4888-21-098
中文关键词:  双幅钝体钢箱梁  涡振性能  风洞试验  间距  透风率
英文关键词:double bluff body steel box girder  vortex vibration performance  wind barrier  space  ventilation rate[HQ]
基金项目:国家自然科学基金资助项目(51978087, 51822803) ;湖南省自然科学基金项目(2020JJ14607)
Author NameAffiliation
LIANG Aaihong School of Civil Engineering, Changsha University of Science &Technology, Changsha 410114, Hunan, China 
MAO Yu School of Civil Engineering, Changsha University of Science &Technology, Changsha 410114, Hunan, China 
LI Chunguang* School of Civil Engineering, Changsha University of Science &Technology, Changsha 410114, Hunan, China 
HAN Yan School of Civil Engineering, Changsha University of Science &Technology, Changsha 410114, Hunan, China 
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中文摘要:
      以某并列双幅钝体钢箱梁桥为工程背景,通过风洞试验研究双幅钢箱梁的涡振性能并提出合理的气动优化措施。采用1∶40比例节段模型风洞试验,测试了各攻角下主梁的涡激振动位移响应时程;在最不利攻角下,研究了双幅箱梁间距对主梁涡振性能的影响,并进一步在变化间距基础上改变栏杆封闭形式和透风率,测试其对涡振性能的影响。研究结果表明:双幅箱梁间距对涡振性能影响明显,且间距1.5m时涡振性能最优,但仍然高于规范限值;间距较小时,降低栏杆透风率,会延长双幅箱梁涡振风速区间,涡振振幅明显增大,箱梁断面气动稳定性降低。
英文摘要:
      Based on the engineering background of a parallel double bluff body steel box girder bridge, the vortex vibration performance of double bluff body steel box girder is studied through wind tunnel test, and the reasonable aerodynamic optimization measures are put forward. The vortex induced vibration (VIV) displacement response time histories of the main girder at different attack angles were measured by 1∶40 scale segmental model wind tunnel test. Moreover, under the most unfavorable angle of attack, the influence of the spacing between two box girders on the vortex vibration performance of the main girder is studied, and the influence of the railing closure form and ventilation rate on the vortex vibration performance is further tested on the basis of changing the spacing as well. The results show that the distance between two box girders has obvious influence on the vortex vibration performance, and the vortex vibration performance is the best when the distance is 1.5m, but it is still higher than the code limit. It is found that when the spacing is small, reducing the railing ventilation rate will increase the vortex vibration wind speed range of double-width box girder, and the amplitude of vortex vibration will increase, and the aerodynamic stability of box girder section will decrease.
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