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全直桩码头是一种新型高桩码头结构型式,在离岸深水海域得到越来越广泛的应用。该结构的承载机理、破坏模式及设计计算方法等与传统高桩码头结构存在较大差异,目前研究尚不完善。采用ABAQUS建立全直桩码头结构–地基相互作用三维弹塑性有限元模型,研究水平荷载作用下码头的承载变形特性及破坏模式。明确了对于水平荷载作用下的离岸深水全直桩码头,基桩的塑性破坏是结构失稳的控制因素,地基土体的承载力对结构水平极限承载力不起决定性作用。在此基础上,采用经典的P–y曲线,建立了全直桩码头水平向承载力简化计算方法。该方法可以计算出桩身任意位置的内力及变形,且适于大、小位移情况。并提出了以“塑性铰”作为简化计算方法中水平极限承载力的判断标准。通过与有限元计算结果进行对比,验证了所建立简化计算方法的正确性。
Full straight piled wharf is a new type of tall piled wharf structure, which is used more and more widely in the offshore deepwater area. The bearing mechanism, failure mode, design and calculation method of the structure are quite different from those of the traditional high-pile wharf structure. At present, the research is not perfect. ABAQUS is used to establish three-dimensional elasto-plastic finite element model of all-straight-pile wharf structure-foundation interaction to study the bearing deformation characteristics and failure modes of wharf under horizontal load. It is clear that the plastic failure of the foundation piles is the control factor of structural instability under the horizontal deep-water full-straight piled wharf under horizontal load. The bearing capacity of the foundation soil does not play a decisive role in the horizontal ultimate bearing capacity of the structure. Based on this, a simplified calculation method of horizontal bearing capacity of all -right pile wharf is established by using the classic P-y curve. The method can calculate the internal force and deformation of the pile at any position, and is suitable for large and small displacements. And put forward “plastic hinge” as a simplified method to determine the horizontal bearing capacity of the judgment criteria. The correctness of the simplified calculation method is verified by comparing with the finite element calculation results.