Online Response Test on Saturated Sand Seabed Underneath Structure Subjected to Ice and Seismic Loads
Notice bibliographique
Résumé
Abstract In order to investigate the interaction between offshore structure and base ground subjected to seismic and ice loads, a substructure on-line dynamic testing system was developed. A dynamic response analysis by computer and a pseudo-dynamic loading test which obtains the restoring force of material experimentally are combined by a computer on-line data processing system. The analyses were carried out on an offshore gravity structure based on sand seabed subjected to ice load and earthquake motion by this method. Residual deformation of base ground were observed because of development of pore water pressure in the sand layer due to cyclic loads induced by drifting floe and earthquake. As a result, unique response behaviour of base ground and structure was observed in the present study. Introduction On April 12, 1986, the Molikpaq deployed in the Canadian Beaufort Sea suffered dynamic force induced by drifting floe1), 2). Although ice loading was considered as a quasi-static situation, much of the ice loading of the Molikpaq at significant load levels had been associated with cyclic, dynamic loading. Development of pore pressure was measured by piezometer installed in the sandfill core in it. This led to a research effort on the stability of base ground underneath the offshore structures in ice-sea. The similar platforms are constructed in Okhotsk near Sakhalin. In this area, not only ice load but also seimic force should be considered in practical design. For the purpose of investigating the interaction between offshore structure and base ground subjected to ice load and seismic forces, a substructure on-line dynamic testing system was developed in this study by combining the response analysis with the simple shear tests on real soil elements. In the present method, a computer analysis of dynamic response and a pseudo-dynamic loading test were combined with a computer on-line data processing system3). With this system, which was devised to analyze the overall response behaviour, the simple shear tests were adopted only for a few layers beneath the structure demonstrating complicated properties of restoring forces, while numerical models ware applied to the remaining layers of ground and super-structure. The analyses were carried out on an offshore gravity structure in ice sea based on sand seabed by this method. The ice load which was calculated by KARNA-NKK model4) was applied in order to simulate the given penetration speed of drifting floe against structure. At the same time, earthquake motion was input from the bottom of base ground. Degradation and residual shear deformation of base ground were observed because of developing pore water pressure in the sand layer due to cyclic loads induced by drifting floe and earthquake. Stress Condition in Soil Element beneath Offshore Structure The stress condition and behaviour of soil elements beneath the offshore structure which are expected during earthquake are shown in Fig. 1 and Table 1. The overburden stress Ðv' and earth pressure at rest Ðh' exist on the planes perpendicular to them before earthquake. When the earthquake happens, cyclic shear stresses exert on the both planes.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».