*HEADING
 CONNECTOR LOCK/STOP/FRICTION BEHAVIOR IN LINEAR DYNAMICS PROCEDURES 
 /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
 K=100.0
**
** 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
 <K>,
*CONNECTOR DAMPING, COMPONENT=1
 <C>,
*CONNECTOR STOP, COMPONENT=1
 0.86,1.14
**
** BOUNDARY CONSTRAINTS (BASE STATE)
**
*BOUNDARY
 NALL,2,3
 FIXED,1,
**
**
*STEP
 STEP-1: OBTAIN NATURAL MODES OF THE 2-D.O.F. SYSTEM
**
*FREQUENCY, EIGENSOLVER=SUBSPACE
 2,
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*NODE PRINT
 U1,RF1
*EL PRINT, ELSET=AXIAL
 CTF1,CEF1,CRF1
 CU1,
 CSLST 
*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: OBTAIN STEADY STATE DYNAMIC RESPONSE 
	 IN TERMS OF PHYSICAL DEGREES OF FREEDOM - DIRECT
** USE CONNECTOR LOAD
**
*STEADY STATE DYNAMICS, DIRECT, INTERVAL=EIGENFREQUENCY
 12, 60
**
*CONNECTOR LOAD, LOAD CASE=1
 ACTUATOR,1,-1.0
*CONNECTOR LOAD, LOAD CASE=2
 ACTUATOR,1,-1.0
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*OUTPUT, HISTORY
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF1,CEF1,CVF1,CRF1
 CU1,
*NODE PRINT, FREQUENCY=1
 U1,V1,A1,PU1
 CF1,RF1
*EL PRINT, ELSET=AXIAL, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1,
 PHCTF1,PHCEF1,PHCVF1,PHCRF1
 CU1,PHCU1
 CSLST 
*EL PRINT, ELSET=ACTUATOR, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1
 PHCTF1,PHCEF1,PHCVF1,PHCRF1
 CU1,PHCU1
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CVF,CRF
 PHCTF,PHCEF,PHCVF,PHCRF
 CU,PHCU
*END STEP
**
**
*STEP, NLGEOM
 STEP-3: CHANGE THE BASE STATE - STOP CONNECTOR 1
**
*STATIC
 0.05,1.0,,0.1
*CLOAD
 2,1,20.0
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*ELEMENT OUTPUT
 NFORC,ELEN
*OUTPUT, HISTORY
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF1,CEF1,CVF1,CRF1
 CU1,CP1
*NODE PRINT, FREQUENCY=1
 U1,CF1,RF1
*EL PRINT, ELSET=AXIAL, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1,
 CU1,CP1
 CSLST
*EL PRINT, ELSET=ACTUATOR, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1
 CU1,CP1
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CVF,CRF,CP,CU
*END STEP
**
** REPEAT ALL STEPS 
**
*STEP
 STEP-4: OBTAIN NATURAL MODES OF THE 2-D.O.F. SYSTEM
**
*FREQUENCY, EIGENSOLVER=SUBSPACE
 2,
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*NODE PRINT
 U1,RF1
*EL PRINT, ELSET=AXIAL
 CTF1,CEF1,CRF1
 CU1,
 CSLST 
*EL PRINT, ELSET=ACTUATOR
 CTF1,CEF1,CRF1
 CU1,
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CRF,CU
*END STEP
**
**
*STEP
 STEP-5: OBTAIN STEADY STATE DYNAMIC RESPONSE 
	 IN TERMS OF PHYSICAL DEGREES OF FREEDOM - DIRECT
** USE CONNECTOR LOAD
**
*STEADY STATE DYNAMICS, DIRECT, INTERVAL=EIGENFREQUENCY
 12, 60
**
*CONNECTOR LOAD, LOAD CASE=1
 ACTUATOR,1,1.0
*CONNECTOR LOAD, LOAD CASE=2
 ACTUATOR,1,1.0
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*OUTPUT, HISTORY
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF1,CEF1,CVF1,CRF1
 CU1,
*NODE PRINT, FREQUENCY=1
 U1,V1,A1,PU1
 CF1,RF1
*EL PRINT, ELSET=AXIAL, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1,
 PHCTF1,PHCEF1,PHCVF1,PHCRF1
 CU1,PHCU1
 CSLST
*EL PRINT, ELSET=ACTUATOR, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1
 PHCTF1,PHCEF1,PHCVF1,PHCRF1
 CU1,PHCU1
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CVF,CRF
 PHCTF,PHCEF,PHCVF,PHCRF
 CU,PHCU
*END STEP
**
**
*STEP, NLGEOM
 STEP-6: CHANGE THE BASE STATE
**
*STATIC
 0.05,1.0,,0.1
*CLOAD
 2,1,10.0
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*ELEMENT OUTPUT
 NFORC,ELEN
*OUTPUT, HISTORY
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF1,CEF1,CVF1,CRF1
 CU1,CP1
*NODE PRINT, FREQUENCY=1
 U1,CF1,RF1
*EL PRINT, ELSET=AXIAL, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1,
 CU1,CP1
 CSLST
*EL PRINT, ELSET=ACTUATOR, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1
 CU1,CP1
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CVF,CRF,CP,CU
 NFORC,
*END STEP
**
** REPEAT ALL STEPS 
**
*STEP
 STEP-7: OBTAIN NATURAL MODES OF THE 2-D.O.F. SYSTEM
**
*FREQUENCY, EIGENSOLVER=SUBSPACE
 2,
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*NODE PRINT
 U1,RF1
*EL PRINT, ELSET=AXIAL
 CTF1,CEF1,CRF1
 CU1,
 CSLST
*EL PRINT, ELSET=ACTUATOR
 CTF1,CEF1,CRF1
 CU1,
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CRF,CU
*END STEP
**
**
*STEP
 STEP-8: OBTAIN STEADY STATE DYNAMIC RESPONSE 
	 IN TERMS OF PHYSICAL DEGREES OF FREEDOM - DIRECT
** USE CONNECTOR LOAD
**
*STEADY STATE DYNAMICS, DIRECT, INTERVAL=EIGENFREQUENCY
 12, 60
**
*CONNECTOR LOAD, LOAD CASE=1
 ACTUATOR,1,1.0
*CONNECTOR LOAD, LOAD CASE=2
 ACTUATOR,1,1.0
**
*OUTPUT, FIELD
*NODE OUTPUT
 U,RF
*OUTPUT, HISTORY
*ELEMENT OUTPUT, ELSET=CONNECTORS
 CTF1,CEF1,CVF1,CRF1
 CU1,
*NODE PRINT, FREQUENCY=1
 U1,V1,A1,PU1
 CF1,RF1
*EL PRINT, ELSET=AXIAL, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1,
 PHCTF1,PHCEF1,PHCVF1,PHCRF1
 CU1,PHCU1
 CSLST
*EL PRINT, ELSET=ACTUATOR, FREQUENCY=1
 CTF1,CEF1,CVF1,CRF1
 PHCTF1,PHCEF1,PHCVF1,PHCRF1
 CU1,PHCU1
*NODE FILE
 U,RF
*EL FILE, ELSET=CONNECTORS
 CTF,CEF,CVF,CRF
 PHCTF,PHCEF,PHCVF,PHCRF
*END STEP