*HEADING
 RANDOM RESPONSE ANALYSIS - /STANDARD VERIFICATION, 2D CONNECTORS
**
*NODE, NSET=NALL
 1,0.0,0.0,
 2,1.0,0.0,
 3,2.0,0.0,
 4,3.0,0.0,
*NSET, NSET=FIXED
 1,4
*PARAMETER
 C=1.0
 KAXIAL1=1.0E3
 U1=1.0E-3
 KAXIAL2=KAXIAL1/10
 U2=100*U1
 F1=KAXIAL1*U1
 F2=F1+KAXIAL2*(U2-U1)
 mF1=-F1
 mF2=-F2
 mU1=-U1
 mU2=-U2
**
** CONNECTOR ELEMENTS
**
*ELEMENT, TYPE=CONN2D2, ELSET=AXIAL
 1,1,2
 2,2,3
*ELEMENT, TYPE=CONN2D2, ELSET=ACTUATOR 
 3,3,4
*ELSET, ELSET=CONNECTORS
 AXIAL,ACTUATOR 
**
** MASS ELEMENTS
**
*ELEMENT, TYPE=MASS, ELSET=MASS
 1001,1
 1002,2
 1003,3
 1004,4
**
** SECTION DEFINITIONS
**
*MASS, ELSET=MASS
 1.0,
*CONNECTOR SECTION, ELSET=AXIAL, BEHAVIOR= CB_AXIAL
 AXIAL
*CONNECTOR SECTION, ELSET=ACTUATOR
 AXIAL
**
** CONNECTOR BEHAVIOR DEFINITIONS
**
*CONNECTOR BEHAVIOR, NAME= CB_AXIAL
*CONNECTOR ELASTICITY, COMPONENT=1, NONLINEAR
 <mF2>,<mU2>
 <mF1>,<mU1>
 <F1>,<U1>
 <F2>,<U2>
*CONNECTOR DAMPING, COMPONENT=1
 <C>,
**
** BOUNDARY CONSTRAINTS (BASE STATE)
**
*BOUNDARY
 NALL,2,3
 FIXED,1,
**
**
*PSD-DEFINITION, NAME=WHITE, TYPE=FORCE
 1.0,0.0,0.0
 1.0,0.0,60.0
**
**
*STEP
 STEP-1: OBTAIN NATURAL MODES OF THE 2-D.O.F. SYSTEM
**
*FREQUENCY, EIGENSOLVER=SUBSPACE,SIM=NO
 2,
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF,CEF,CU
*NODE PRINT
 U1,RF1
*EL PRINT, ELSET=AXIAL
 CTF1,CEF1,CRF1
 CU1,
*EL PRINT, ELSET=ACTUATOR
 CTF1,CEF1,CRF1
 CU1,
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CRF,CU
*END STEP
**
**
*STEP
 STEP-2: RANDOM RESPONSE
**
*RANDOM RESPONSE
 12.0,60.0,20,3,0
**
*MODAL DAMPING, MODAL=DIRECT
 1,2,0.02
*SELECT EIGENMODES
 1,2
*CONNECTOR LOAD, LOAD CASE=1
 ACTUATOR,1,-1.0
*CONNECTOR LOAD, LOAD CASE=2
 ACTUATOR,1,-1.0  
**
*CORRELATION, PSD=WHITE, TYPE=UNCORRELATED, COMPLEX=NO
 1,1
 2,1
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RU,RF,RRF
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF,CEF,CU
*OUTPUT, HISTORY
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF1,CEF1,CRF1,RCTF1,RCEF1,RCRF1
 CU1,RCU1
*NODE PRINT, FREQUENCY=1
 U1,V1,A1,TU1,TV1,TA1
 RU1,RV1,RA1,RTU1,RTV1,RTA1
 CF1,RF1,RRF1
*EL PRINT, ELSET=AXIAL, FREQUENCY=1
 CTF1,CEF1,CRF1,RCTF1,RCEF1,RCRF1
 CU1,RCU1
*EL PRINT, ELSET=ACTUATOR, FREQUENCY=1
 CTF1,CEF1,CRF1,RCTF1,RCEF1,RCRF1
 CU1,RCU1
*NODE FILE
 U,RU,RF,RRF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CRF,RCTF,RCEF,RCRF
 CU,RCU
*END STEP