*ARCHE

Data format:

Two lines followed by one or several lines, as follows:

NARCH NBRG R MASTER_NODE K EPS_INF EPS_SUP
NODECAB1 NODECAB2 NODECAB3 NODECAB4
NODE1(1) NODE2(1) NBR(1) EL1(1) EI_NBR(1)
...
NODE1(i) NODE2(i) NBR(i) EL1(i) EI_NBR(i)
...
NODE1(NBRG) NODE2(NBRG) NBR(NBRG) EL1(NBRG) EI_NBR(NBRG)

Status:

Optional.

Purpose:

To define arch pipe.

Details :

Parameter	Description
NARCH	Arch identification number
NBRGUID	Number of guides
R	Radius of curved parts
MASTER_NODE	Identification number of master node of the arch
NODECAB1,2,3,4	Cable nodes identification numbers
i	Number of guides
NODE1(i)	Identification number of the first node of guide (i)
NODE1(i)	Identification number of the second node of guide (i)
NRB(i)	Number of elements defining guide (i)
LIST(i)	List of elements for guide (i). These elements are part of a riser or a mooring line.
K	Numerical parameters (see note below). Must be positive. Default value is K = 10
EPS_INF	Numerical parameters (see note below). Must be a real value between 0 and 1. Default value is EPS_INF = 0.1
EPS_SUP	Numerical parameters (see note below). Must be a real value between 0 and 1. Default value is EPS_SUP = 0.1

Restrictions:

14 or 15 elements must be used to define a guide (NBR = 14 or 15)

Note

To take into account the contact between the pipe and the arch, the pipe curvature is prevented from overtaking the arch curvature : C_arch=1/R.

The bending stiffness of the arch elements (EI) is automatically changed into a multi-linear stiffness and a diagram is created to progressively increase EI to K*EI.

This transition zone is ranging from C_inf to C_sup defined as such : C_inf = (1 EPS_INF)*C_arch C_sup = (1 + EPS_SUP)*C_arch