斜向波流与大尺度矩形承台相互作用的数值模拟
|
摘要
为研究斜向波流作用下承台结构受力特点,建立三维波流与结构物相互作用的数学模型,计算分析斜向波流入射角度θ(即波流入射方向与横桥向夹角)对大尺度矩形承台波流力的影响。分析结果表明:入射角度θ对承台顺桥向波流力的影响系数与sinθ成正比,对横桥向波流力的影响系数与cosθ二次相关,对总波流力影响系数与sinθ二次相关,该影响规律可用于承台斜向波流力的快速估算。与纯波情况相比,波流共同作用增大了流体质点的惯性力,使得承台波流力均明显大于纯波力,入射角θ对纯波力或波流力的影响规律极为接近,设计时可按一致考虑。为避免低估或高估承台波流力,设计时应考虑实际波流入射角度的影响。
The load bearing behaviors of the pile cap structure under the action of oblique waves and currents are studied.Based on the numerical model of the interaction of the three-dimensional waves and currents and the structure,the influence of the angle of incidenceθof the oblique waves and currents on the large-scale rectangular pile cap is calculated and analyzed.The angle of incidence refers to the angle between the incidence direction and the transverse bridge direction.The results of the analysis indicate that the influential coefficient of the angle of incidenceθto the wave-current force of the pile cap along the bridge length is proportional to sinθ,and influential coefficient of the angle of incidence to the transverse wave-current force is equivalent to cosθsquared,and the influential coefficient of the angle of incidence to the total wave-current force is equivalent to sinθsquared.The influential law can be used to the rapid estimation of oblique wavecurrent force acting on the pile cap.Compared with pure waves,the wave-current interaction strengthened the inertial force of the fluid-particle interaction,making the wave-current force on the pile cap obviously greater than the pure wave force.The influential law of angle of incidenceθto pure wave force or to the wave-current force is extremely close,which can be considered the same in the design.To avoid the underestimation or overestimation of the wave-current force on the pile cap,the actual influence of angle of incidence should be considered in the design.
The load bearing behaviors of the pile cap structure under the action of oblique waves and currents are studied.Based on the numerical model of the interaction of the three-dimensional waves and currents and the structure,the influence of the angle of incidenceθof the oblique waves and currents on the large-scale rectangular pile cap is calculated and analyzed.The angle of incidence refers to the angle between the incidence direction and the transverse bridge direction.The results of the analysis indicate that the influential coefficient of the angle of incidenceθto the wave-current force of the pile cap along the bridge length is proportional to sinθ,and influential coefficient of the angle of incidence to the transverse wave-current force is equivalent to cosθsquared,and the influential coefficient of the angle of incidence to the total wave-current force is equivalent to sinθsquared.The influential law can be used to the rapid estimation of oblique wavecurrent force acting on the pile cap.Compared with pure waves,the wave-current interaction strengthened the inertial force of the fluid-particle interaction,making the wave-current force on the pile cap obviously greater than the pure wave force.The influential law of angle of incidenceθto pure wave force or to the wave-current force is extremely close,which can be considered the same in the design.To avoid the underestimation or overestimation of the wave-current force on the pile cap,the actual influence of angle of incidence should be considered in the design.
引文
[1]陈翔,梅新咏.平潭海峡公铁两用大桥主航道斜拉桥深水基础设计[J].桥梁建设,2016,46(3):86-91.
[2]张立超.平潭海峡公铁两用大桥通航孔桥桥塔墩承台施工技术[J].桥梁建设,2017,47(6):1-6.
[3]胡勇,雷丽萍,杨进先.跨海桥梁基础波浪(流)力计算问题探讨[J].水道港口,2012,33(2):101-105.
[4]祝兵,康啊真,邢帆,等.三维波浪与圆端形吊箱围堰相互作用的数值模拟[J].桥梁建设,2013,43(6):82-87.
[5]郑东生,张启博,唐自航,等.承台淹没深度对海洋桥梁基础波浪荷载的影响[J].世界桥梁,2017,45(6):29-33.
[6]刘浪.跨海桥梁下部结构波流力计算方法研究(博士学位论文)[D].成都:西南交通大学,2017.
[7]梅大鹏,刘清君,胡勇,等.跨海桥梁承台波流力计算方法与合成系数研究及应用[J].世界桥梁,2017,45(1):51-55.
[8]聂锋,潘军宁,王晓敏,等.大尺度柱状结构物波流荷载研究[J].水利水运工程学报,2013(3):65-70.
[9]康啊真.三维波浪作用下跨海深水桥梁围堰的动力响应研究(博士学位论文)[D].成都:西南交通大学,2014.
[10]张胡.大尺度结构波浪力计算研究[J].水道港口,2018(2):151-156,187.
[11]Lin P,Li C W.Wave-Current Interaction with a Vertical Square Cylinder[J].Ocean Engineering,2003,30(7):855-876.
[12]王树青,梁丙臣.海洋工程波浪力学[M].青岛:中国海洋大学出版社,2013.
[2]张立超.平潭海峡公铁两用大桥通航孔桥桥塔墩承台施工技术[J].桥梁建设,2017,47(6):1-6.
[3]胡勇,雷丽萍,杨进先.跨海桥梁基础波浪(流)力计算问题探讨[J].水道港口,2012,33(2):101-105.
[4]祝兵,康啊真,邢帆,等.三维波浪与圆端形吊箱围堰相互作用的数值模拟[J].桥梁建设,2013,43(6):82-87.
[5]郑东生,张启博,唐自航,等.承台淹没深度对海洋桥梁基础波浪荷载的影响[J].世界桥梁,2017,45(6):29-33.
[6]刘浪.跨海桥梁下部结构波流力计算方法研究(博士学位论文)[D].成都:西南交通大学,2017.
[7]梅大鹏,刘清君,胡勇,等.跨海桥梁承台波流力计算方法与合成系数研究及应用[J].世界桥梁,2017,45(1):51-55.
[8]聂锋,潘军宁,王晓敏,等.大尺度柱状结构物波流荷载研究[J].水利水运工程学报,2013(3):65-70.
[9]康啊真.三维波浪作用下跨海深水桥梁围堰的动力响应研究(博士学位论文)[D].成都:西南交通大学,2014.
[10]张胡.大尺度结构波浪力计算研究[J].水道港口,2018(2):151-156,187.
[11]Lin P,Li C W.Wave-Current Interaction with a Vertical Square Cylinder[J].Ocean Engineering,2003,30(7):855-876.
[12]王树青,梁丙臣.海洋工程波浪力学[M].青岛:中国海洋大学出版社,2013.