*BEAMPRO

Data format:

An arbitrary number of lines with 12 values each, optionally followed by one to 3 lines with up to 21 values each, as follows:

IPRO XL XM D CD CM CDL CML ES EIX EIY GCT COEFMU &
NBVALA \(\epsilon_1 Force_1\) ... \(\epsilon_{NBVALA} Force_{NBVALA}\) &
NBVALB \(\rho_1 Moment_1\) ... \(\rho_{NBVALB} Moment_{NBVALB}\) &
NBVALC \(\tau_1 Moment_1\) ... \(\tau_{NBVALC} Moment_{NBVALC}\)

Status:

Mandatory when beam elements are used.

Purpose:

To define mechanical and geometrical properties of a set of beam elements

Restrictions:

The total number of beam element properties sets is limited to MAXPRO (version dependent)

Details :

Parameter	Description
IPRO	Identification number of the following set of properties
XL	Beam length. If XL is set to 0. XL will be the distance between the nodes of the beam
XM	Mass per unit length of beam
D	Diameter of the beam used for buoyancy and hydrodynamic forces calculations
CD	Morison normal drag coefficient
CM	Morison normal inertia coefficient
CDL	Morison axial drag coefficient
CML	Morison axial inertia coefficient
	Axial stiffness of the beam =0 for multi-linear axial stiffness
EIX	Bending stiffness about local OX axis =0 for multi-linear flexion stiffness
EIY	Bending stiffness about local OY axis =0 for multi-linear torsion stiffness
GCT	Torsion stiffness
COEFMU	Additional shear stiffness. Default value is 1.
NBVALA	Number of couples (e,Force) defining a multi-linear axial stiffness behaviour NBVALA =0 if ES is not 0 NBVALA must be lower than 10
NBVALB	Number of couples (r,Moment) defining a multi-linear flexion stiffness behaviour NBVALB =0 if EIy is not 0 NBVALB must be lower than 10
NBVALC	Number of couples (t,Moment ) defining a multi-linear torsion stiffness behaviour NBVALC =0 if GCt is not 0 NBVALB must be lower than 10

Note

Beam stiffness is defined by : Axial stiffness : E . A Bending stiffness : E . IY and E . IZ Torsion stiffness : G . CT where G = E/2(1+NU) Shear stiffness : G . A * COEFMU.

COEFMU is useful to avoid an important shear deformation of the Mindlin beam. It is usually not necessary to use it.

To define a variable stiffness behaviour , couples must be given in increasing order of the corresponding strain U (= e, r or t) and loads (forces or moment)

The axial multi-linear law may refer to the true tension instead of the effective tension (see *BEAMPRO2)

Examples:

*BEAMPRO

c[.]	[m]	[kg/m]	[m]	[.]	[.]	[.]	[.]	[N]	[N.m2]	[N.m2]	[N.m2/rad]
1	15.0	250.93	.3776	0.7	2.0	0.	0.	8.4e8	9.98e4	9.98e4	1.1e7

*BEAMPRO

c	[.]	[m]	[kg/m]	[m]	[.]	[.]	[.]	[.]	[N]	[N.m2]	[N.m2]	[N.m2/rad]
1	1.0	133.93	.2447	0.0	0.0	0.	0.	1.6e5	1.41e7	1.41e7	1.e4	1.e4

Last term COEFMU was added to avoid shear. It is two orders of magnitude above the order of magnitude EI/EA/L/L where L is the beam length. It is used for example when important elasticity (meaning EA low) with no shear is required.

*BEAMPRO

c[.]	[m]	[kg/m]	[m]	[.]	[.]	[.]	[.]	[N]	[N.m2]	[N.m2]	[N.m2/rad]
1	1.0	133.93	.2447	0.0	0.0	0.	0.	1.6e5	0	0	1.e4

1 &
0 &
3 0. 0. 0.1 1.e3 0.35 1.e4 &
0

This defines a beam with :

a constant axial stiffness
a constant torsion stiffness
a flexion behaviour defined by : between 0 and 0.1. m-1 the bending stiffness is 1.e4 Nm2 and when the curvature reach 0.1 m-1 and is lower than .0.35 m-1the bending stiffness is 3.6e4 Nm2