不规则波作用下浮式平台对浮式栈桥运动响应特性的影响

Effects of Floating Platform on Dynamic Response Characteristics of Floating Bridge in Irregular Waves

浮式平台-浮式栈桥系统具有运输拼组快速,受海底地形环境影响小等优点,在陆-海间大规模人员、物资和装备输送中发挥重要作用。为探究浮式平台-浮式栈桥系统在波浪中的运动响应特性,基于势流理论建立了浮式平台-浮式栈桥多浮体系统的数值模型,计算了该系统的运动响应,并与水池试验的测量结果进行了对比验证。结果表明所建立的数值模型能够较为准确地反映该多浮体系统在不规则波中的运动响应特性。在此基础上,进一步研究了不同波浪谱峰频率、浪向角和桥节相对平台位置下平台对浮式栈桥运动响应的影响。分析发现:高频波浪下平台对栈桥运动的屏蔽效果较低频波浪下更优,运动响应可减少约40%~50%;迎浪状态下平台对栈桥运动的屏蔽效果优于斜浪状态;当波浪入射方向相对稳定且浪向角小于20°时,相较于将栈桥布置于近浪侧和中部的情况,平台对远浪侧栈桥运动的屏蔽效应更显著。

On account of the advantages of fast assembly and being less affected by the seabed terrain environment,the floating platform-floating bridge system plays a significant role in the large scale transportation of personnel,materials and equipment between land and sea.In order to explore the motion response characteristics of floating platform-floating bridge system in waves,the numerical model of a floating platform-floating bridge system was established based on the potential flow theory,and the motion responses of the system were calculated.The values of the numerical model were verified by the model test in a wave tank.The results show that the dynamic response characteristics of the multi-floating body system in irregular waves can be relatively accurately reflected by the numerical model.Based on this,further research was conducted on the influence of the platform on the motion response of the floating bridge under different wave spectrum peak frequencies,wave direction angles and the position of the bridge relative to the platform.It is found that the shielding effect of the platform on bridges motion under high-frequency waves is better than that under low-frequency waves,and the motion responses can be reduced by 40%-50%.The shielding effect of the platform on the bridge motions in head waves is better than that in the oblique waves.When the incident direction of the wave is relatively stable and the wave angle is less than 20°,the shielding effect of the platform on the bridge on the far side of the waves is more significant than that near the waves and in the middle position relative to the platform.