深水钢悬链立管J型铺设时域动力分析

摘要

针对深水钢悬链立管的J型铺设作业的时域动力响应特性,先利用悬链线理论对其进行静力分析,基于动力控制方程,以集中质量法求解得到系统刚度矩阵,考虑船体运动、波流载荷以及管土作用,根据广义α理论将时间离散后积分求解,建立数值求解迭代步骤,得到立管受力分析结果.以3000 m水深钢悬链立管J型铺设为例,使用OrcaFlex软件进行计算分析,结果表明:①触地点的冯米塞斯应力和弯曲应力最大,立管顶端的有效张力最大;②铺管船的性能影响立管铺设,对触地点冯米塞斯应力和弯曲应力以及顶端有效张力的时域分析表明,其幅值变化范围较窄,铺设系统稳定;③校核API规范,各项数据满足铺设要求,可以为工程实际提供参考.%The dynamic responses of steel catenary riser in J-lay operation were analyzed in time domain.The catenary theo-ry was used for static analysis.Stiffness matrix was obtained based on lumped mass method.The motion of vessel,wave and cur-rent load,and the riser-soil interaction were considered.According to the Generalised-αintegration scheme,the simulation time was discreted to setup the numerical solution iteration steps.The dynamic response of the steel catenary riser in J-lay operation in 3 000 m water depth was analyzed.The results showed that the max von Mises stress and bending stress occur at touch down point (TDP);the max effective tension is at the top end of the riser;the J-lay system is stable,because the amplitude variation range of the von Mises stress and bending stress at TDP and the effective tension at the top end are narrow.After checking API code, all the results meet the operation requirements.