张力腿安装及在位状态受力分析与强度评估

Force Analysis and Strength Evaluation for Tension Leg of TLP in Installation and In-Place States

张力腿用于系泊TLP平台,为TLP系统的重要组成部分。设计要求必须进行安装和在位分析,以保证平台的安全性。张力腿在安装下主要承受波浪和流载荷作用,而在位状态还要受到平台偏移的影响。为准确计算张力腿内力,建立了张力腿安装和在位状态下的有限元模型,采用时域分析的方法进行分析。根据张力腿的实际结构,考虑了多种载荷,包括风、流、波浪、静水力和重力的影响。对张力腿内力进行了数值计算。计算结果给出了张力腿在不同状态下的最大内力,并依据规范对张力腿的总体强度进行评估。

The tendon system is used to moor TLP,and it is an important part of TLP.The analysis of the tension leg in installation and in-place conditions must be done to guarantee the safety of the platform.During the installation tendons mainly undergo current and wave loads,and in the in-place state,the tendons are also affected by the platform offset.In order to accurately calculate the internal forces of a tension leg it is necessary to build the model of tendon in installation and in-place states and apply the fully time-domain analysis method.According to the complex structure of tension leg,kinds of loads applied on tendon including wind,current,wave load,hydrostatic pressure and weight,etc.and internal forces of the tension leg are obtained by numerical analysis.The maximum internal force of the tension leg under different conditions is given.According to the calculation results,the global strength of tension leg is evaluated by the design standard.