大攻角下分离双钢箱梁间距对涡振特性的影响  

Influence of the spacing on vortex-induced vibration characteristics of twin separate steel box girders under a large wind attacking angle

作　　者：刘小兵[1,2] 张海东[1] 刘庆宽[1,2] 

机构地区：[1]石家庄铁道大学风工程研究中心,石家庄050043 [2]河北省大型结构健康诊断与控制重点实验室,石家庄050043

出　　处：《振动与冲击》2017年第14期202-207,233,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51308359;51378323);河北省自然科学基金项目(E2013210103;E2014210138);河北省高等学校科学技术研究基金项目(QN20131169)

摘　　要：以某座分离双钢箱梁桥为背景,开展了一系列的节段模型风洞试验。首先分析了-5°^+5°间8个不同风攻角下单箱梁的涡振特性,然后详细研究了+5°风攻角下分离双箱梁在16个不同间距(双箱梁的净间距D与单箱梁宽B之比D/B的变化范围为0.025~4.0)时的涡振特性,并将结果与单箱梁的结果进行了对比。研究发现,间距对上游箱梁和下游箱梁涡振特性的影响均可大致分为4个区间。Based on a bridge with twin separate steel box girders, a number of sectional model wind tunnel tests were performed. The vortex-induced vibration characteristic of a single box girder under 8 different wind attacking angles anging from -5° to ＋5° were studied. Then the vortex-induced vibration characteristics of the twin separate box girders with 16 different spacings under the wind attacking angle of ＋ 5 ° were investigated and the results were compared with that of the single box girder. The spacing ratio D/B was from 0. 025 to 4. 0, where D is the net spacing between twin box girders and B is the width of the single box girder. The test results show that the influences of spacing on vortex-induced vibration characteristics of both windward box girder and leeward box girder can be divided into four regions.

关 键 词：分离双箱梁 涡激振动 间距 大攻角 风洞试验 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]