箱式超大型浮体结构在不规则波中的水弹性响应

箱式超大型浮体结构的水平尺度很大，结构的相对弯曲刚度大大下降，它在海洋环境中的水弹性响应必须考虑。此外，其设计寿命远远超过一般的船舶和海洋工程结构物，从结构设计的角度出发，需要预报结构在整个生命期内可能受到的波浪诱导弯矩以及结构的应力。为此，在应用三维线性水弹性理论计算得到浮体结构动力响应传递函数的基础上，进行了结构动力响应的短期预报和长期预报。计算结果表明，浮体结构的垂向弹性变形与刚体升沉运动幅值相当，波浪诱导弯矩和应力的长期预报值均较大。

Hydroelastic Response of Box-Typed Very Large Floating Structure in Irregular Waves

Due to the huge horizontal size and small thickness of box-typed very large floating structures (VLFS), the relative bending stiffness of the structure is greatly decreased and the hydroelastic response in waves must be considered. In addition, the design life of VLFS is much larger than that of conventional ships and offshore structres. From the viewpoint of structural design, the maximum expected value of wave induced moment of the structure in service life must be predicted. In this paper, 3D linear hydroelastic theory is used to analyze the response of rigid body motion and vertical bending modes of box-typed VLFS in unit amplitude regular wave. And then short term and long term prediction of dynamic response of the structure are carried out. The calculation results show that the amplitude of the vertical flexible deflection of the structure is almost equivalent to that of the heave of the rigid body motion. And the values of short term and long term prediction of wave induced bending moment and bending stress are quite large.