扁平箱梁的颤振临界风速估算
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摘要
提出一种估算扁平箱梁颤振临界风速的方法,分析了影响桥梁主梁断面颤振稳定性的参数,选定公式拟合数学的模型,利用诺模图和最小二乘原理初步拟合出计算公式,并用CFD数值模拟技术考虑扁平箱梁宽高比与斜腹板倾角对颤振临界风速的影响,并将宽高比对颤振临界风速的影响纳入计算公式,最后将计算公式应用于工程实例。结果表明计算误差在20%以下,为桥梁断面颤振稳定性方案比选和科研提供可靠的参考依据。
A method for estimating the critical flutter wind speed of flat box girder was presented,and the parameters affecting the flutter stability of the main girder section of the bridge were analyzed.And then the formula fitting the mathematical model was chosen,the nomogram and least square principle were used as well to preliminarily fit the calculation formula.And also,CFD numerical simulation technology was used to consider the influence of width-height ratio of flat box girder and inclined web angle on the critical flutter wind speed.The influence of widthheight ratio on critical flutter wind speed was taken into account in the calculation formula.Finally,the calculation formula is applied to an engineering example,and the calculation error is less than 20%.It provides a reliable reference for the flutter stability schemes of bridge sections and scientific research.
A method for estimating the critical flutter wind speed of flat box girder was presented,and the parameters affecting the flutter stability of the main girder section of the bridge were analyzed.And then the formula fitting the mathematical model was chosen,the nomogram and least square principle were used as well to preliminarily fit the calculation formula.And also,CFD numerical simulation technology was used to consider the influence of width-height ratio of flat box girder and inclined web angle on the critical flutter wind speed.The influence of widthheight ratio on critical flutter wind speed was taken into account in the calculation formula.Finally,the calculation formula is applied to an engineering example,and the calculation error is less than 20%.It provides a reliable reference for the flutter stability schemes of bridge sections and scientific research.
引文
[1]CHEN X.Improved Understanding of Bimodal Coupled Bridge Flutter Based on Closed-Form Solutions[J].Journal of Structural Engineering,2007.133(1):22-31.
[2]BARTOLI G,MANNINI C.A Simplified Approach to Bridge Deck Flutter.[J].Journal of Wind Engineering and Industrial Aerodunamics,2008,96,229-256.
[3]项海帆,林志兴.大跨度桥梁颤振稳定性的简化判别[J].同济大学学报(自然科学版),1994,22(4):409-414.
[4]葛耀君,项海帆,TANAKA H.随机风荷载作用下的桥梁颤振可靠性分析[J].土木工程学报,2003,36(6):42-46,79.
[5]白桦,高慧,李宇,等.借助三分力系数的桥梁颤振稳定性评价[J].中国公路学报,2014,27(7):68-73.
[6]白桦,方成,王峰,等.桥梁颤振稳定性快速评价参数及其应用[J].中国公路学报,2016,29(8):92-98,133.
[7]刘乐.基于静三分力系数扁平箱梁悬索桥颤振临界风速的快速估算[D].西安:长安大学,2017.
[8]陈帅宇.基于CFD的自由耦合振动法计算桥梁颤振临界风速[D].西安:长安大学,2017.
[9]常光照.斜风作用下大跨度桥梁颤振性能研究[D].上海:同济大学,2006.
[10]丁泉顺.大跨度桥梁耦合颤抖振响应的精细化分析[D],上海:同济大学,2001.
[11]周志勇,陈艾荣,项海帆.涡方法用于桥梁断面气动导数和颤振临界风速的数值计算[J].振动工程学报,2002,15(3):83-87.
[12]许福友,马如进,陈艾荣,等.苏通大桥全桥气弹模型设计与模态调试[J].工程力学,2009,26(12):150-154,174.
[2]BARTOLI G,MANNINI C.A Simplified Approach to Bridge Deck Flutter.[J].Journal of Wind Engineering and Industrial Aerodunamics,2008,96,229-256.
[3]项海帆,林志兴.大跨度桥梁颤振稳定性的简化判别[J].同济大学学报(自然科学版),1994,22(4):409-414.
[4]葛耀君,项海帆,TANAKA H.随机风荷载作用下的桥梁颤振可靠性分析[J].土木工程学报,2003,36(6):42-46,79.
[5]白桦,高慧,李宇,等.借助三分力系数的桥梁颤振稳定性评价[J].中国公路学报,2014,27(7):68-73.
[6]白桦,方成,王峰,等.桥梁颤振稳定性快速评价参数及其应用[J].中国公路学报,2016,29(8):92-98,133.
[7]刘乐.基于静三分力系数扁平箱梁悬索桥颤振临界风速的快速估算[D].西安:长安大学,2017.
[8]陈帅宇.基于CFD的自由耦合振动法计算桥梁颤振临界风速[D].西安:长安大学,2017.
[9]常光照.斜风作用下大跨度桥梁颤振性能研究[D].上海:同济大学,2006.
[10]丁泉顺.大跨度桥梁耦合颤抖振响应的精细化分析[D],上海:同济大学,2001.
[11]周志勇,陈艾荣,项海帆.涡方法用于桥梁断面气动导数和颤振临界风速的数值计算[J].振动工程学报,2002,15(3):83-87.
[12]许福友,马如进,陈艾荣,等.苏通大桥全桥气弹模型设计与模态调试[J].工程力学,2009,26(12):150-154,174.