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《工程(英文)》 >> 2017年 第3卷 第6期 doi: 10.1016/j.eng.2017.06.001

用于预测涡振稳态振幅的箱梁竖向涡激力简化非线性模型

a State Key Laboratory of Disaster Reduction in Civil Engineering & Department of Bridge Engineering, College of Civil Engineering & Key Laboratory for Wind Resistance Technology of Bridges of Ministry of Transport, Tongji University, Shanghai 200092, China
b Shanghai Urban Construction Municipal Engineering (Group) Co., Ltd., Shanghai 200065, China
c Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China
d Highway Planning, Survey, Design and Research Institute, Sichuan Provincial Transport Department, Chengdu 610041, China

发布日期: 2017-12-30

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摘要

采用同步测力测振大比例节段模型风洞试验方法,研究了作用在全封闭、半封闭和中央开槽三种典型箱梁上竖向涡激力的非线性特性,通过分析竖向涡激力不同成分的能量演化规律和对涡振响应的贡献,探索了竖向涡激共振的起振、发展和自限幅的机理。结果显示:不同类型箱梁的竖向涡激力的非线性成分通常会有所不同,但控制竖向涡激振动稳态响应幅值的最重要涡激力成分都是速度一次线性和三次非线性气动阻尼力成分。前者向振动系统提供了一个恒定的负气动阻尼比,因而是驱动涡振振幅发展的根本动力,而后者则向系统提供了一个与涡振速度平方成正比的正气动阻尼比,从而实质上成为导致涡振自限幅现象的内在因素。有鉴于此,本文提出了一个能高精度预测大跨度桥梁涡振稳态振幅的箱梁断面竖向涡激力通用简化非线性数学模型,并进行了验证。

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