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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