移动及冲击荷载作用下浮式平台的动力响应分析

摘要

According to the floating platform of Fu jian Nan ping Zhang Lake Reservoir Bridge, the finite element model of floating platform was established by ANSYS and Water spring theory was referenced. The calculated dynamic response was considered by the moving load and impact load. The results show that the dynamic response of floating platform under moving load is not obvious when considering or not considering additional water mass and hydrodynamic damping consideration; the dynamic response of floating platform under impact load is obvious when considering or not considering additional water mass and hydrodynamic damping. The displacement, acceleration response decay quickly when considering the hydrodynamic damping displacement. The natural frequency of floating platform is increased and the cycle peak gradually of floating platform is gradually decay.%以福建南平樟湖库区大桥的浮式平台为背景，采用ANSYS建立浮式平台的有限元模型并且引用水弹簧理论，计算其在移动及冲击荷载作用下的动力响应。结果表明：浮式平台在移动荷载作用下考虑与不考虑附加水质量和水动力阻尼时，其动力响应并不明显；而在冲击荷载作用下，浮式平台考虑与不考虑附加水质量和水动力阻尼时则有较大区别。考虑水动力阻尼时位移、加速度响应衰减得快；不考虑水动阻尼时浮式平台固有频率增大，周期峰值逐渐衰减。