液固耦合作用对不同截面深水桥墩的自振特性影响研究
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摘要
介绍了深水桥墩液固耦合模型在ANSYS软件中模型的建立。利用Morison方程提出的附加质量概念考虑动水压力对桥墩作用,采用3种截面积相等的不同类型桥墩,即淹没水深相同时,所受动水压力相等。利用ANSYS建立实体单元与Fluid30单元来分析液固耦合作用对不同类型桥墩的自振特性影响。通过实例分析发现液固耦合对桥墩自振频率的影响是显著的,桥墩完全被水淹没时,其自振频率最大下降了24.2%。进一步研究发现相同截面面积的不同类型的桥墩,在相同水深时,由于其液固耦合接触面沿坐标轴方向上的正投影面积大小不一样,造成桥墩沿该方向上自振频率下降量大不相同。且沿坐标轴方向正截面面积越大,桥墩沿该轴方向上的弯曲自振频率和扭曲自振频率下降越大。
This paper mainly analyzes the establishment of liquid-solid coupling model of deep-water piers in AN-SYS software. Through the additional quality resulting from Morison equation, it explores the hydrodynamic pres-sure on three different types of piers with equal cross-sectional areas, which would subject to the same hydrody-namic pressure in water of the same depth. Then, it establishes a solid unit and Fluid30 unit by use of ANSYS toanalyze effects of liquid-solid coupling on vibration frequency of different piers. Through the case study, it foundout that effects of liquid-solid coupling on the pier's vibration frequency was significant and its biggest decrease ofthe vibration frequency was 24.2% when the pier was completely submerged in water. Further research showedthat for the different piers of the same cross-sectional areas in water of the same depth, the vibration frequency de-clined differently due to different liquid-solid coupling orthographic projection of the contact surface area alongthe axis direction. It maintains that the greater the coordinate axis cross-sectional area along the positive directionis, the more the bending vibration frequency and distortional natural frequency along the axis decreases.
This paper mainly analyzes the establishment of liquid-solid coupling model of deep-water piers in AN-SYS software. Through the additional quality resulting from Morison equation, it explores the hydrodynamic pres-sure on three different types of piers with equal cross-sectional areas, which would subject to the same hydrody-namic pressure in water of the same depth. Then, it establishes a solid unit and Fluid30 unit by use of ANSYS toanalyze effects of liquid-solid coupling on vibration frequency of different piers. Through the case study, it foundout that effects of liquid-solid coupling on the pier's vibration frequency was significant and its biggest decrease ofthe vibration frequency was 24.2% when the pier was completely submerged in water. Further research showedthat for the different piers of the same cross-sectional areas in water of the same depth, the vibration frequency de-clined differently due to different liquid-solid coupling orthographic projection of the contact surface area alongthe axis direction. It maintains that the greater the coordinate axis cross-sectional area along the positive directionis, the more the bending vibration frequency and distortional natural frequency along the axis decreases.
引文
[1]高学奎,朱晞.地震动水压力对深水桥墩的影响[J].北京科技大学学报,2006,30(1):56-58.
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[4]柳春光,齐念,考虑液固耦合作用的深水桥墩地震响应分析[J].防灾减灾工程学报,2009,29(4):434-436.
[5]卢华喜,李军,周叶威,高速列车引起的深水桥墩流固耦合的振动分析[J].华东交通大学学报,2014,31(2):27-29.
[6]刘保东,李鹏飞,高超,不同水深情况下水中桥墩地震响应研究[J].土木工程学报,2010,43(S):200-203.
[7]杨万里,深水桥墩液固耦合作用下的自振特性研究[J].四川建筑科学研究,2012,38(3):164-168.
[8]张敏.桥墩与河水流固耦合振动分析[D].大连:大连交通大学,2006:40-43.
[2]李悦,宋波.地震时作用于深水桥墩上的动水力及对桥墩动力响应的影响[J].北京科技大学学报,2011,33(3):389-390.
[3]黄信,李忠献.动水压力作用下深水桥墩非线性地震响应分析[J].土木工程学报,2011,44(1):66-73.
[4]柳春光,齐念,考虑液固耦合作用的深水桥墩地震响应分析[J].防灾减灾工程学报,2009,29(4):434-436.
[5]卢华喜,李军,周叶威,高速列车引起的深水桥墩流固耦合的振动分析[J].华东交通大学学报,2014,31(2):27-29.
[6]刘保东,李鹏飞,高超,不同水深情况下水中桥墩地震响应研究[J].土木工程学报,2010,43(S):200-203.
[7]杨万里,深水桥墩液固耦合作用下的自振特性研究[J].四川建筑科学研究,2012,38(3):164-168.
[8]张敏.桥墩与河水流固耦合振动分析[D].大连:大连交通大学,2006:40-43.
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