基于Sesam的柔性连接浮式栈桥波浪动力特性分析

Analysis of wave dynamic characteristics of floating pier with flexible connection on SESAM software

为了保证浮式栈桥能够在波浪中正常使用,基于三维势流软件Sesam对系泊浮式栈桥的运动响应与缆绳张力进行非线性时域耦合数值预报。分析了桥节间有无缆绳连接、浪向角等因素对浮式栈桥运动响应的影响。计算结果表明,浮式栈桥的运动响应与缆绳张力受缆绳连接与浪向的影响很大。在有义波高为1.25m谱峰周期为6s时,有缆绳连接的桥节间相对纵荡最大幅值是无缆绳连接时的0.54倍;当浪向为90°时,浮式栈桥横荡方向与垂荡方向运动幅值范围最大;当浪向为105°时,桥节间相对纵荡运动幅值最大。综上所述,桥节间有缆绳连接可以大幅度减少其相对运动幅值,在布置浮式栈桥时,建议选取浪向角为150°~180°。

To guarantee the floating pier works normally under the influence of wave,a time-domain nonlinear coupled method was used to numerically forecast the motion responses and the mooring tensions of the moored floating pier system by sesam software in this paper.The influences of the connecting mooring lines between the adjacent piers and different wave directions on the motion responses of the floating pier were concerned.The results reveal that the above-mentioned influences are very great.As significant wave height is 1.25 mand peak spectral period is 6s,the peak amplitude of the relative surge motion of the adjacent piers with the connecting mooring lines is 0.54 times as large as that without the connecting mooring lines.And when the wave direction is 90°,the amplitudes of sway and heave motions of the floating pier are the largest.As the wave direction is 105°,the amplitudes of the relative motions of the adjacent piers are the largest.As a whole,the connecting mooring lines between the adjacent piers can reduce the amplitude of relative motion greatly.And when placing the floating pier,the wave direction should be 150°~180°.