GSA Export: NASTRAN Keywords

Introduction

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

Index

Beam

Beam prestress

Note

Transferred as thermal loads

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

EIGRL,LOAD

EIGRL,LOAD

Description

Specification

Parameters

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

Index

ENDDATA

ENDDATA

Description

End of data

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

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

GRID

GRID

Description

Nodes

Parameters

GRIDGRID,no,x,y,z,axis

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

In-plane

In-plane loads

Note

Transferred as thermal load

Index

LOAD

LOAD

Description

Static load combination

Parameters

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

Index

MAT1

MAT1

Description

Cable properties

Parameters

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

Index

MAT1,

MAT1, MAT8

Description

Material

Parameters

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

Index

MPC

MPC

Description

Constraint equations

Parameters

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

Index

MPC

MPC

Description

Joints

Parameters

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

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

PBARL

PBARL

Description

Section shape properties

Parameters

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

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

PLOAD1

PLOAD1

Description

Beam loads

Parameters

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

Index

PLOAD4

PLOAD4

Description

Face loads

Parameters

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

Index

PLOAD4

PLOAD4

Description

Face loads

Parameters

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

Index

PSHELL

PSHELL

Description

2D properties

Parameters

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

Index

PSOLID

PSOLID

Description

2D properties

Parameters

PSOLIDPSOLID,pid,mid

Index

PSOLID

PSOLID

Description

3D properties

Parameters

PSOLIDPSOLID,pid,mid

Index

RBE2

RBE2

Description

Rigid Constraints

Parameters

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

Index

SPC

SPC

Description

Restraints

Parameters

SPC SPC,1,no,spc,0

Index

SPCD

SPCD

Description

Applied displacements

Parameters

SPCDSPCD,case,node,dir,value

Note

Axis ignored

Index

SPCD

SPCD

Description

Settlements

Parameters

SPCDSPCD,case,node,dir,value

Index

TEMPD

TEMPD

Description

Reference temperature

Parameters

TEMPDTEMPD,case,0,

Note

GSA doesn't use this so assumed value is zero

Index

TEMPP1

TEMPP1

Description

s 2D thermal loads

Parameters

TEMPP1TEMPP1,case,elem,T,G

Index

TEMPRB

TEMPRB

Description

Beam thermal loads

Parameters

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

Index

Index

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

12 Jun 2025 at 08:14
© Oasys Ltd 2025