====== RESSO ======
Spring distributed on a line
===== Description =====
This element consists in a spring distributed on a parabolic or straight line. It should be used with plane beam elements ([[elements:kirsh|KIRSH]] or [[elements:minds|MINDS]]) to simulate the behavior of soil from each side of these beam elements. The line is defined by 2 or 3 nodes. The springs are located on the left when travelling along the element in increasing node order. \\ \\ {{  :elements:resso.png?400|}}
These elements are particularly useful for the simulation of digging, along a slurry wall, sheet piling, ... \\ \\
The behavior of the spring, and therefore of the soil is defined by fictive law [[laws:resso|RESSO]]. \\ \\
Element type: 63 \\
Implemented by: F. Collin + J.P. Radu (1999)\\


==== Files ====

Prepro: RESSOA.F \\
Lagamine: RESSOB.F
===== Input file =====
^ TITLE (A5)^^
|TITLE |"RESSO" |
^Control data (2I5)^^
|NELEM |Number of elements |
|INSIG| = 0 No calculation of initial pressure \\ = 1 Automatic calculation of initial pressure \\ :!: The calculation is valid for horizontal springs, the Y axis being directed towards the top, and is based on earth pressure coefficient at rest $K_0$, the volumic weight of the soil, and the position of a potential groundwater table, all these data being defined in law [[laws:resso|RESSO]] |
^Definition of the elements (2I5/3I5)^^
|NINTE|Number of integration points (2 or 3)|
|LMATE |Material law |
|NNODE(3) |List of nodes (2 or 3)|

===== Results =====
Effort in the spring