知识与财富的链接
基于考虑接触的钢悬链式立管SCR （Steel Catenary Riser）触地点处的结构特性,分别采用了考虑管土分离的线性截断模型以及包含土体吸力效应的帽盖模型来描述P-y曲线。通过改变上端浮体的垂荡运动幅度、土体吸力系数以及海床刚度,对SCR触地点处的动力响应以及疲劳损伤特性进行了分析。分析结果表明,SCR触地点的垂向位移、弯矩、等效应力以及疲劳损伤均随着浮体垂荡运动幅度的增加而呈上升趋势。SCR触地点的垂向位移随着土体吸力系数的增大由高幅低频响应转变为低幅高频响应。SCR触地点的疲劳损伤随着海床刚度的增加呈现先稳定再增加再稳定的趋势。
Based on the structural characteristics of touchdown points of steel catenary risers,a linear truncation model considering pipe-soil separation and a cap model containing soil suction effect are used to describe P-y curves.The dynamic response and fatigue damage characteristics at the touch down point of the riser were analyzed by changing the floating body heaving motion amplitude,the soil suction factor and the seabed stiffness.The results indicated that the vertical displacement,bending moment,equivalent stress and the fatigue damage at the touchdown point increased with the increase of floating body heaving motion amplitude.With the increase of the soil suction factor,the vertical displacement response of the steel catenary riser at touchdown points changed from the high-amplitude low-frequency response to low-amplitude high-frequency response.With the increase of the seabed stiffness,the fatigue damage of the steel catenary riser at touchdown points showed stable characteristics at first and then increased and finally became stable again.
