The response of pile supported Tension Leg Platforms during seismic loading and seabed liquefaction is analyzed numerically, taking consistently into account the pile-tendon-platform interaction. The emphasis is on the system response when liquefaction in the subsoil is extensive, leading to degradation of the pseudo-static factors of safety against pullout failure of the pile well below unity. It is shown that the pile resistance to pullout failure decreases drastically during shaking due to subsoil liquefaction, but fully recovers during the following excess pore pressure dissipation phase and may even exceed the initial (pre-shaking) resistance value. Pile head displacements develop steadily during shaking and the following dissipation phase, but only during the finite time period when the static pullout factor of safety of the pile remains less than unity. Thus, final pile head displacements may increase considerably when this time period is elongated. Due to the generally high tensional stiffness of the tendons, relative to the buoyancy stiffness of the platform, the pile head pullout is mostly transmitted to the platform, with only a small percentage corresponding to reduction of tendon elongation. For the cases examined herein, the potential loss of platform buoyancy and tendon pretension may prove detrimental but is unlikely to threaten the safety and functionality of the platform. On the other hand, initially minor tilting of the platform (e.g. due to long period lateral loading and differential tendon pretension) may be magnified during seismic loading above allowable limits.

桩支撑的张力腿平台在地震加载和海床液化过程中的响应进行了数值分析，同时考虑了桩-筋-平台的相互作用。重点是在底土中广泛液化时的系统响应，导致安全的伪静态安全系数降低，以防止远低于统一的桩的拔出破坏。结果表明，由于底土液化，在震动过程中，桩对拔出破坏的阻力急剧下降，但在随后的超孔隙压力消散阶段完全恢复，甚至可能超过初始（预震动）阻力值。在摇晃和随后的消散阶段，桩头位移稳定发展，但仅在桩的静态拔出安全系数保持小于 1 的有限时间段内。因此，当这段时间延长时，最终的桩头位移可能会显着增加。由于钢筋束的抗拉刚度普遍较高，相对于平台的浮力刚度，桩头拉拔主要传递到平台上，只有一小部分对应于钢筋束伸长率的降低。对于此处检查的案例，平台浮力和肌腱预紧力的潜在损失可能证明是有害的，但不太可能威胁平台的安全性和功能性。另一方面，平台最初的轻微倾斜（例如，由于长期横向载荷和不同的预应力）在地震载荷期间可能会放大到超过允许的极限。