Chain tensions below this will be calculated if the initial element length is large enough. Chain tension at padeye depth is the tension in the chain at the depth of the padeye specified by the user.Length “lost” in cutting through the soil is the difference between the above two terms.Original chain length is the length measured vertically upwards from the padeye to the sea bed and then horizontally along the sea bed to the point where the chain actually exits.The equilibrium and geometry of chain elements may be calculated beyond the padeye, but this does not affect padeye forces. Chain length from padeye to sea bed is the length measured along the chain from the padeye to the point where the chain leaves the sea bed.

Chain Finite Element Static Force Balance in Seabed Soil Input Data STA CHAIN, Buried anchor chain program input Principal Results Principal Results from Buried Anchor Chain Analysis in Seabed Soil The figure below shows the forces acting on a finite element of the chain. These soil forces are considered both normal to, and tangential to each chain elemental section. The basis of the method is to assume a planar chain configuration, with chain ‘tension forces and chain self weight, balanced at each elemental location by soil forces. Primary results from the program provide the tension vector the chain (or cable) applies at the buried padeye, given the load and angle specified by the user at the top end. STA CHAIN permits the user to specify up to two different soil layers, each of which may have varying strength properties. However, the analysis considers a lateral load applied to a chain and calculates its equilibrium cut profile through the sea bed. The program does not consider how the end of the chain may have been embedded. The program was originally developed for work with the US Navy and plate anchors in 1988. STA chain is a computer program for the analysis of anchor chain (or wire) cutting through soil.

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