中文摘要：

提出了一种计算平台上部组块风载荷的方法,用于研究四柱式张力腿平台在随机波浪和随机风的联合作用下的非线性动力响应。在张力腿平台六自由度非线性刚度矩阵和运动方程中考虑了平台水平运动（纵荡、横荡和首摇）与下沉运动之间的非线性耦合。基于JONSWAP波浪谱计算平台浮箱和立柱承受的波浪载荷;选用NPD风谱,计算作用于平台上部组块和立柱的风载荷。应用四阶龙格-库塔方法求解运动方程,得到平台运动的时间历程、运动幅度的均值和标准差。将计及上部组块风载荷的计算结果与未计及上部组块风载荷的计算结果进行了比较分析。计算结果表明,平台上部组块的风载荷将导致平台纵荡、横荡和垂荡运动平衡位置发生显著变化,且垂荡运动幅度明显增大。而风载荷对于平台摇摆运动的影响则较小。

英文摘要：

In this paper, a method computing wind load on the topside of a leg platform （TLP） is proposed. A nonlinear restoring stiffness matrix of the TLP is derived with consideration of the coupled effect of horizontal motions （surge, sway and yaw） and the set-down motion. Differential equations of TLP with six degrees of freedom are derived. Wave loads on pontoons and columns are evaluated by using JONSWAP wave spectrum. Based on NPD wind spectrum, wind loads on topside and columns are calculated. Differential equation of motion is solved with a 4th order of Runge-Kutta＇s integration scheme, and the time histories, mean values and standard deviations of motion amplitudes are obtained. Nonlinear dynamic responses of TLP considering wind loads on the topside are acquired in the time domain, and compared with that without considering the wind load on the topside. It is shown that wind loads on topside have important influences on the equilibrium positions of surge, sway and heave motions, as well as on the amplitude of heave motion. However, it has little impact on the other degrees of freedom, such as roll, pitch and yaw motions.