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Surface installations: fixed

机译：表面设施：固定

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This paper investigates the potential for using skirted foundations as an alternative to spudcans in an attempt to mitigate punch-through failure of jack-up rigs during installation and preloading in sand-over-clay deposits. The results from a series of numerical analyses on the skirt length were presented in combination with different conditions of sand-over-clay deposit. Three-dimensional large deformation finite element (LDFE) analyses were carried out using the coupled Eulerian-Lagrangian approach. The sand was represented with a modified Mohr-Coulomb model and the clay with an extended Tresca model. The results showed that the likelihood and severity of punch-through increased with (ⅰ) increasing the thickness of the sand layer, (ⅱ) increasing the strength of the clay layer, and (ⅲ) reducing the strength non-homogeneity of the clay layer. The degree of mitigation was increased with increasing the skirt length. An optimal skirt length of 0.25D was suggested accounting for the rig towing constraint. Prediction models have been proposed for assessing (ⅰ) the potential for punch-through failure, and (ⅱ) the resistance profile for skirted foundations penetrating sand-over-clay deposits. Structural integrity and ensuring the stability of steel frame structures, including marine and coastal structures, are the main challenges for designers in civil infrastructures, particularly in oil platforms, subjected to tough periodic and non-periodic environmental loading conditions. Variable loadings with different amplitudes and frequencies may lead to the stability of steel structures loss. In order to keep the stability of the steel structures and prevent possible damages, reliable yet efficient structural control systems are in demand. Conventional structural control systems need significant activation energy and/or in-depth users knowledge to be effective. Most recently, smart materials and systems, notably shape memory alloy (SMA) and magnetorheo-logical fluid (MRF), are considered to replace with the conventional systems. In this study, the SMA-MRF based structural control systems are installed in a simplified marine structure to investigate the frequency responses of the structure subjected to three scaled ground motions. Three structural parameters including the root-mean-square (RMS), the peak displacement, and particularly the frequency analysis are studied. The results show remarkable enhancement in structural behavior equipped with the SMA-MRF based system.
机译：本文调查了使用裙边基础的替代品，以试图在安装和预加载在砂粘土沉积物中进行升降机的故障来减轻穿孔穿过升降机的故障。裙长长度的一系列数值分析的结果与砂粘土沉积物的不同条件结合呈现。使用耦合的Eulerian-lagrangian方法进行三维大变形有限元（LDFE）分析。用改进的MoHR-Coulomb模型和粘土用延伸的Tresca模型表示沙子。结果表明，通过（Ⅰ）增加砂层的厚度（Ⅰ）增加粘土层的强度，（Ⅲ）降低粘土层的强度非均匀性，增加（Ⅰ）的可能性和严重程度。随着裙子长度的增加，减轻程度增加。建议为钻机牵引约束占0.25d的最佳裙子长度。已经提出了预测模型进行评估（Ⅰ）穿过故障的可能性，以及（Ⅱ）穿透粘土沉积的裙子基础的电阻曲线。结构完整性和确保钢框架结构的稳定性，包括海洋和沿海地组，是民用基础设施的设计人员的主要挑战，特别是在石油平台上受到严峻的周期性和非定期环境负载条件。具有不同幅度和频率的可变负载可能导致钢结构损失的稳定性。为了保持钢结构的稳定性并防止可能的损坏，可靠但有效的结构控制系统需求。传统的结构控制系统需要显着的激活能量和/或深入用户知识来有效。最近，智能材料和系统，特别是形状记忆合金（SMA）和磁能逻辑流体（MRF）被认为是用常规系统替换的。在这项研究中，基于SMA-MRF的结构控制系统安装在简化的海洋结构中，以研究经受三个缩放的地面运动的结构的频率响应。研究了三种结构参数，包括根均方（RMS），峰位移，特别是频率分析。结果表明，配备SMA-MRF系统的结构行为显着增强。

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    《Oceanographic Literature Review》 |2020年第5期|917-918|共2页
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