离岸深水码头波浪力作用下顶高程对码头损伤的影响

Influence of wave force on damage of offshore deep water wharf on the top elevation

针对剪胀性海洋地基,建立了地基-桩-上部结构和波浪动荷载作用的三维动力响应数值模型。将损伤本构模型应用于码头结构,分析了不同码头顶高程下码头结构和地基的动力响应规律。研究结果显示:高桩码头受到波浪冲击,相对净空ΔhH为0. 33左右时内力最大,损伤最严重;相对净空为0. 5时损伤和内力明显减小;相对净空大于0. 42时桩基内最大等效应力随顶高程增加明显减小。虽然桩基周围土层的影响范围变化不是很大,但上部结构具有较大的动力放大效应,即使是小量的地基变形量变化也可能引起上部结构内较大的破坏,因此设计时应考虑地基-桩-上部结构-波浪的相互协同作用效应。针对海洋性地基的非线性变形特性,建议建立整体模型进行分析,使设计更加科学可靠。

The three-dimensional dynamic response numerical model of the foundation-pile-superstructure system under the wave dynamic load is established for the shear dilatant marine foundation.Damage constitutive model is applied on the wharf structure.The law of the dynamic response in the wharf structure as well as foundation at various wharf elevations is analyzed.The results show that:the high-piled wharf is subjected to wave impact,with the maximum internal force and the most serious damage when compared with about 0.33 in clearanceΔh H;when the relative clearance was 0.5,the damage and internal force decreased significantly;when the relative clearance is greater than 0.42,the maximum equivalent stress in pile foundation decreases with the increase of height.Although the influence of soil around pile foundation is not very big change,but the upper structure has a larger power amplification effect,even a small amount of foundation deformation changes can also cause the destruction of the upper structure within the larger,therefore the design should consider the foundation-pile-superstructure wave synergy effect each other.In view of the nonlinear deformation characteristics of marine foundation,it is suggested to build a whole model for analysis,so as to make the design more scientific and reliable.