ULTIMATE LIMIT STATE OF DIFFERENT JACK-UP LEG SYSTEM

Created on 2016.08.03 267 views
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The offshore exploration and production activity has picked up as a result of the rise in energy demand globally. In recent years, the Jack Up is considered the most popular drilling rig in the offshore exploration activities. Currently, the Jack Up makes up of about 51% of the total Rig fleet in the world. The Jack Up is able to drill in shallow waters of up to 175 meters. The leg structure is an important part of the Jack Up rig, and is considered a Primary Structure in most Classification Rules. There are mainly two different types of leg structure in the world now, the shell type typically for shallower water and the truss type for deeper water and harsher environmental conditions. In the market now, there are 2 types of leg truss system, 3-chorded Legs and 4-chorded legs. Each type can also have either the inverted K, X, or the star truss. Every designer have been stating that their design is good. However there is currently no studies showing the advantages and disadvantages of each truss system. Therefore in order to elucidate the advantages and shortcomings of each system as well as the structural response when the leg structure is in contact with a collision. The aim of the current project is • By using push over analysis determine the ultimate limit strength of Jack Up Trussed Legs with the following geometrical designs: i. 3 Chorded with Inverted K Truss ii. 3 Chorded with X Truss iii. 3 Chorded with Mixed Truss iv. 4 Chorded with Inverted K Truss v. 4 Chorded with X Truss vi. 4 Chorded with Mixed Truss • To investigate the structural response of the leg structures when loads are applied in different direction. • To identify the advantages and disadvantages of each structural truss system.
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