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/SECT/PARAL

/SECT/PARAL

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/SECT/PARAL

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Block Format Keyword

/SECT/PARAL - Sections

Description

A section is a set of nodes and a set of elements.

Those sets are built automatically, by intersecting the concerned groups of elements with a parallelogram.

sect_paral

Format

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/SECT/PARAL/sect_ID/unit_ID

sect_title

node_ID1

node_ID2

node_ID3

 

ISAVE

 

symbol_time

symbol_a_14

file_name

grbric_ID

 

grshel_ID

grtrus_ID

grbeam_ID

grsprg_ID

grtria_ID

Ninter

 

Iframe

 

Input read only if Ninter > 0

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(4)

(5)

(6)

(7)

(8)

(9)

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int_ID1

int_ID2

int_ID3

int_ID4

int_ID5

int_ID6

int_ID7

int_ID8

int_ID9

int_ID10

 

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XM

YM

ZM

 

 

 

 

XM1

YM1

ZM1

 

 

 

 

XM2

YM2

ZM2

 

 

 

 

hmtoggle_plus1Flag Definition

Field

Contents

SI Unit Example

sect_ID

Section identifier

(Integer, maximum 10 digits)

 

unit_ID

Optional unit identifier

(Integer, maximum 10 digits)

 

sect_title

Section title

(Character, maximum 100 characters)

 

node_ID1

Node identifier N1

(Integer)

 

node_ID2

Node identifier N2

(Integer)

 

node_ID3

Node identifier N3

(Integer)

 

ISAVE

Saving the data flag

(Integer)

= 0: Do not save

= 1: Displacements are saved in the file "file_name"

= 2: 1 + forces are saved

= 100: The data contained in the file "file_name" is read as input for the calculation

= 101: 100 + forces are recomputed for the error calculation

 

symbol_time

Time step for saving the data

(Real)

symbol_S_unit

symbol_a_14

Coefficient for filtering (symbol_a_14 < 1)

(Real)

 

file_name

Root name of the file which contains the flag output. The extension for this file is nameSC01

(Character, maximum 100 characters)

 

grbric_ID

Brick group identifier

(Integer)

 

grshel_ID

Shell group identifier

(Integer)

 

grtrus_ID

Truss group identifier

(Integer)

 

grbeam_ID

Beam group identifier

(Integer)

 

grsprg_ID

Spring group identifier

(Integer)

 

grtriag_ID

Triangle group identifier

(Integer)

 

Ninter

Number of interfaces

(Integer)

 

Iframe

Computing the skew center local skew is the skew flag defined by node_ID1, node_ID2, and node_ID3 (see figure in Comment 14)

(Integer)

The center C is given in the local skew:

= 0: the origin of the local skew (C0)

= 1: the geometrical center of the section (C1)

= 2: the CoG of the section (C2)

= 3: point o(0,0,0) is the center of the local skew

The center C is given in the global skew:

= 10: the origin of the global skew (C0)

= 11: the geometrical center of the section (C1)

= 12: the CoG of the section (C2)

= 13: point o(0,0,0) is the center of the global skew

 

int_ID1, int_ID2, ..., int_IDn

Optional interface identifiers, if Ninter > 0

(Integer)

 

XM

X coordinate of M

(Real)

 

YM

Y coordinate of M

(Real)

 

ZM

Z coordinate of M

(Real)

 

XM1

X coordinate of M1

(Real)

 

YM1

Y coordinate of M1

(Real)

 

ZM1

Z coordinate of M1

(Real)

 

XM2

X coordinate of M2

(Real)

 

YM2

Y coordinate of M2

(Real)

 

ZM2

Z coordinate of M2

(Real)

 

hmtoggle_plus1Comments
1.Resulting forces and moments acting on these sections will be stored in the Time History file.
2.You can save force and moment in an output file. This output could be used as input for another calculation.
3.Nodes node_ID1 and node_ID2 define the local X-axis of the section.
4.Nodes node_ID1, node_ID2 and node_ID3 define the local plane XY of the section.
5.Flag ISAVE is used for saving data in the SC01 file for the cut methodology.

It is recommended to set ISAVE =0 if no cut methodology is intended, since performance may be decreased and memory for RADIOSS Engine will be increased.

6.If ISAVE = 1 or 2, data are saved in the file "file_nameSC01" at a frequency symbol_trit.
7.If ISAVE = 100 or 101, displacements from file "file_nameSC01" are read as imposed displacements. The displacements are filtered according to the following relations:

y+ = symbol_a_14x + (1-symbol_a_14)y

with,

clip0584  for filtering -3dB

clip0585  for filtering -6dB

Where, T is the filtering period, in general, T = 10symbol_time.

Typical use clip0586.

8.ISAVE = 101 allows the forces read in the file "file_nameSC01" and the forces computed in the calculation to be compared.
9.Moments are computed with respect to the section center defined by the parameter Iframe (see figure in Comment 14) and expressed in the local section frame.
10.Normal force is the component normal to the XY plane of the section. Tangential force is the component in the plane of the section.

In plot file FNX, FNY, FNZ, FTX, FTY, and FTZ are respectively the components of normal and tangential forces in the global frame (see figure below for the definition of the local frame).

11.Moments calculation if Iframe = 0, 1, 2 or 3.

clip0125

12.Moments calculation if Iframe = 10, 11, 12 or 13.

clip0126

13.Forces and moments calculation.

clip0127

14.Local reference frame (Ox and Oy):

clip0128

15.The center C0 is given by the nodes: node_ID1, node_ID2 and node_ID3.
16.The center C1 is the geometric center of the section nodes:

clip0587

where, n = nodes.

17.The center C2 is the center of gravity of the section nodes:

clip0588

18.The center C3 is the node with coordinates (0, 0, 0) in the global skew.
19.Frame had to be a moving frame (defined with three nodes).
20.MM1 and MM2 (see figure above) define the parallelogram, which is used to define the set of elements and the set of nodes of the section.

The set of element is created from the elements intersecting the plane of the parallelogram. The set of nodes of the section is created from the nodes of those intersected elements, which are on the upside (Z > 0) of the plane of the parallelogram.

See Also:

Skew and Frame (/SKEW & /FRAME)