Static Strength Analysis of Elliptical Chord Tubular T-joints Using Fea

1.1 Offshore Structures: Offshore structures used for oil and gas extraction have the common function of providing a safe, dry working environment for the equipment and persons those operates the platform. Jacket supported drilling equipment as a guide for the piled foundations. The substructure referred to as the jacket is a three dimensional space frame made from large tubular steel members. The jacket which takes the loadings from the top side and the sea environment is piled to the sea bed.theses piles must also be able to resist tension as hydrodynamic forces on the structure have a tendency to cause over turning. To construct a steel jacket it is necessary to join the large diameter tubular steel members in somewhere. These tubular joints or nodes are major sources of difficulty and high cost in the design of jacket. Tubular joints can be classified in to four categories. They are the simple welded joints, complex welded joints, cast steel joints and composite joints.