GSA Export: NASTRAN Keywords


Introduction

GSA exports basic data to a NASTRAN bulk data file. All data should be checked carefully asthere are no direct equivalent features in NASTRAN to some of the GSA features. For exampleGrid loads cannot be exported directly to NASTRAN. These loads must first be expanded to beamloads.

Index


GSA/NASTRAN

GSA/NASTRAN export

Index


ID,

ID,...

Description

Title and control

Parameters

ID ID ,title
SOL SOL
SOL 101 (static)
SOL 103 (modal)
SOL 105 (buckling)
CEND CEND
TITLE TITLE,job
METHOD METHOD = 1
DISPLACEMENTDISPLACEMENT(PLOT,PHASE) = ALL
FORCE FORCE(PLOT) = ALL (static/buckling)
STRESS STRESS(PLOT) = ALL (static/buckling)
SUPER SUPER(PLOT) = ALL (static/buckling)
OLOAD OLOAD(PLOT) = ALL (static/buckling)
SPCFORCES SPCFORCES(PLOT) = ALL
SPC SPC = 1
MPC MPC = 1

for each case

Parameters

SUBCASE SUBCASE case
SUBTITLE SUBTITLE = load_title
LOAD LOAD = case
TEMPERATURE TEMPERATURE(LOAD) = case
LOAD LOAD = buckle (buckling)
BEGINBULK BEGIN BULK
PARAM PARAM
PARAM,AUTOSPC,YES
PARAM,EPZERO,1.0E-8
PARAM,GRDPNT,0
PARAM,POST,-2

Index


EIGRL,LOAD

EIGRL,LOAD

Description

Specification

Parameters

EIGRLEIGRL,,,modes,,,,MAX (modal)
LOADLOAD,case,1,<factor,case> (buckling)

Index


GRID

GRID

Description

Nodes

Parameters

GRIDGRID,no,x,y,z,axis

Index


SPC

SPC

Description

Restraints

Parameters

SPC SPC,1,no,spc,0

Index


CBAR,CBEAM,CELAS2,CONM2,CGAP,RBAR,CTRIA3,CQUAD4,CTRIA3,CQUAD4,CONROD

CBAR,CBEAM,CELAS2,CONM2,CGAP,RBAR,CTRIA3,CQUAD4,CTRIA3,CQUAD4,CONROD

Description

Elements

Parameters

CBARCBAR,no,prop,topo_1,topo_2,z.x,z.y,z.z,BGG,rls_1,rls_2,off_1.x,off_1.y,off_1.z,off_2.x,off_2.y,off_2.z
CBEAMCBEAM,no,prop,topo_1,topo_2,z.x,z.y,z.z,BGG,rls_1,rls_2,off_1.x,off_1.y,off_1.z,off_2.x,off_2.y,off_2.z
CELAS2CELAS2,no,k,topo_1,topo_2,dir
CONM2CONM2,no,topo,axis,mass,off.x,off.y,off.z,Ixx,Ixy,Iyy,Izx,Iyz,Izz
CGAPCGAP,no,prop,topo_1,topo_2,y.x,y.y,y.z,rl1_1,rls_2
RBARRBAR,no,topo_1,topo_2,dir,dof
CTRIA3CTRIA3,no,prop,topo_1,topo_2,topo_3,,off
CQUAD4CQUAD4,no,prop,topo_1,topo_2,topo_3,topo_4,,off
CTRIA6CTRIA6,no,prop,topo_1,topo_2,topo_3,topo_4,topo_5,topo_6,,off
CQUAD8CQUAD8,no,prop,topo_1,topo_2,topo_3,topo_4,topo_5,topo_6,topo_7,topo_8,,,,off
CONRODCONROD,no,topo_1,topo_2,prop,area,torsion,coeff,nsm
GENELGENEL,no,,u1,c1,u2,c2,...
"K",K11,K21,K31,...K22,K32,..."K",K11,K21,K31,...K22,K32,...

Index


CELAS2

CELAS2

Note

Spring supports

Parameters

CELAS2CELAS2,no,k,topo_1,topo_2,dir

Index


CORD2R,CORD2C,CORD2S

CORD2R,CORD2C,CORD2S

Description

Axis

Parameters

CORD2RCORD2R,no,origin.x,origin.y,origin.z,z.x,z.y,z.z,x.x,x.y,x.z
CORD2CCORD2C,no,origin.x,origin.y,origin.z,z.x,z.y,z.z,x.x,x.y,x.z
CORD2SCORD2S,no,origin.x,origin.y,origin.z,z.x,z.y,z.z,x.x,x.y,x.z

Index


MAT1,

MAT1, MAT8

Description

Material

Parameters

MAT1MAT1,E,G,nu,rho,A
MAT8MAT8,E1,E2,nu12,G12,G13,G23,rho,A1,A2

Index


PSOLID

PSOLID

Description

2D properties

Parameters

PSOLIDPSOLID,pid,mid

Index


PSHELL

PSHELL

Description

2D properties

Parameters

PSHELLPSHELL,pid,mid1,thick,mid2,12i/t3,mid3,ts/t,nsm,

Index


PSOLID

PSOLID

Description

3D properties

Parameters

PSOLIDPSOLID,pid,mid

Index


MAT1

MAT1

Description

Cable properties

Parameters

MAT1MAT1,mid,e,g,nu,rho,a,tref

Index


RBE2

RBE2

Description

Rigid Constraints

Parameters

RBE2RBE2,no,primaryNode,comp,constrainedNodes...

Index


MPC

MPC

Description

Joints

Parameters

MPC MPC,1,constrainedNode,dir,-1,primaryNode,dir,1

Index


MPC

MPC

Description

Constraint equations

Parameters

MPC MPC,1,constrainedNode,dir,-1,primaryNode,dir,1,

Index


GRAV

GRAV

Description

Gravity

Parameters

GRAVGRAV,case,0,gravity,x,y,z

Note

Gravity loads should be defined in a separate set (SID) to other loads - it is up to the user to ensure that this is the case.

Index


SPCD

SPCD

Description

Settlements

Parameters

SPCDSPCD,case,node,dir,value

Index


SPCD

SPCD

Description

Applied displacements

Parameters

SPCDSPCD,case,node,dir,value

Note

Axis ignored

Index


FORCE,MOMENT

FORCE,MOMENT

Description

Node loads

Parameters

FORCEFORCE,case,node,axis,value,x,y,z
MOMENTMOMENT,case,node,axis,value,x,y,z

Index


PLOAD1

PLOAD1

Description

Beam loads

Parameters

PLOAD1PLOAD1,case,elem,type,scale,pos_1,value_1,pos_2,value_2

Index


Beam

Beam prestress

Note

Transferred as thermal loads

Index


PLOAD4

PLOAD4

Description

Face loads

Parameters

PLOAD4PLOAD4,case,elem,value_1,value_2,value_3,value_4

Index


In-plane

In-plane loads

Note

Transferred as thermal load

Index


PLOAD4

PLOAD4

Description

Face loads

Parameters

PLOAD4PLOAD4,case,elem,value_1,value_2,value_3,value_4,node_1,node_4

Index


LOAD

LOAD

Description

Static load combination

Parameters

LOAD LOAD,comb,1,factor,case,factor,case,...

Index


PBAR,PROD

PBAR,PROD

Description

Section properties

Parameters

PBARPBAR,pid,mid,area,i1,i2,j,nsm,,,,,,,,,,,k1,k2,i12
PRODPROD,pid,mid,area,j,c,nsm

Index


PBEAM

PBEAM

Description

Section properties

Parameters

PBEAMPBEAM,pid,mid,area,i1,i2,i12,j,nsm,c1,c2,d1,d2,e1,e2,f1,f2,
so,x/xb,area,i1,i2,i12,j,nsm,c1,c2,d1,d2,e1,e2,f1,f2,so,x/xb,area,i1,i2,i12,j,nsm,c1,c2,d1,d2,e1,e2,f1,f2,
k1,k2k1,k2
PRODPROD,pid,mid,area,j,c,nsm

Index


PBARL

PBARL

Description

Section shape properties

Parameters

PBARLPBARL,prop,mid,group,type,dim1,dim2,...,nsm

Index


PBEAML

PBEAML

Description

Section shape properties

Parameters

PBEAMLPBARL,prop,mid,group,type,null(4),dim1,dim2,...,nsm,so

Index


PGAP

PGAP

Description

Tie, strut properties

Parameters

PGAPPGAP,prop,gap(0),preload(0),stiff,0,0,

Index


TEMPRB

TEMPRB

Description

Beam thermal loads

Parameters

TEMPRBTEMPRB,case,elem,Ta,Tb,Gya,Gyb,Gza,Gzb

Index


TEMPP1

TEMPP1

Description

s 2D thermal loads

Parameters

TEMPP1TEMPP1,case,elem,T,G

Index


TEMPD

TEMPD

Description

Reference temperature

Parameters

TEMPDTEMPD,case,0,

Note

GSA doesn't use this so assumed value is zero

Index


ENDDATA

ENDDATA

Description

End of data

Index


Index

GSA/NASTRAN
ID,
EIGRL,LOAD
GRID
SPC
CBAR,CBEAM,CELAS2,CONM2,CGAP,RBAR,CTRIA3,CQUAD4,CTRIA3,CQUAD4,CONROD
CELAS2
CORD2R,CORD2C,CORD2S
MAT1,
PSOLID
PSHELL
PSOLID
MAT1
RBE2
MPC
MPC
GRAV
SPCD
SPCD
FORCE,MOMENT
PLOAD1
Beam
PLOAD4
In-plane
PLOAD4
LOAD
PBAR,PROD
PBEAM
PBARL
PBEAML
PGAP
TEMPRB
TEMPP1
TEMPD
ENDDATA


07 Apr 2021 at 08:15
© Oasys Ltd 2021