Concrete Offshore platforms Gravity-Based str
نوع محصول :
قیمت :
-
0تومان
Concrete Offshore platforms Gravity-Based structures - سکو های بتنی ثقلی
در این فایل انواع سکو های بتنی ثقلی ، روش نصب ، و موارد استفاده آنها توضیح داده شده است.
فایل pdf به زبان انگلیسی و حجم 14 مگ.
در زیر بخشی از این فایل آورده شده است :
Offshore platforms of the gravity-base category are designed to be founded at or just below the seafloor, transferring their loads to the soil by means of shallow footings. Such gravity-base platforms have usually been constructed of reinforced and prestressed concrete but a few have been built of steel or a hybrid of concrete and steel. These platforms are almost always constructed in their vertical (final) attitude, enabling much or all of the deck girders and equipment to be installed at an inshore site and transported with the substructureto the installation site. These structures are usually self-floating, although, when necessary, additional lift forces may be developed by temporary buoyancy tanks or special lifting vessels. To minimize soil-bearing loads, these structures have a large base “footprint.” To provide buoyancy, they have large enclosed volumes. They thus generate much greater inertial forces under waves and earthquake, 50,000 to 100,000 tons of lateral force being typical, with special structures developing even more Thus sliding tends to become the dominant mode of failure, at least for water depths up to 150 to 200 m.
To transfer this lateral load into the soil and thus prevent sliding, steel skirts and steel dowels are
employed, designed to penetrate and thus force the failure surface farther below the seafloor. Such skirts
also provide protection against scour and piping. While the skirts are typically fixed to the base of the
platform during fabrication, in special cases where shallow water limits draft, skirts or spuds may be
installed through sleeves after the structure has been seated on the seafloor. A typical GBS structure is
shown in Figure 12.1.1 and 12.1.2
.
برچسب ها: سازه های فراساحل ، سکو های بتنی ثقلی ، انواع سکو های بتنی ثقلی