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SUBROUTINE PLOAD1 (OPT,ISLT,V,SA,SB,BA,BB,PA,PB,TA,TB,SLT,EPT)
C
C PLOAD1 CALCULATES THE END LOADS ON A BAR ELEMENT FOR PLOAD1 LOADS
C IT IS CALLED ONLY BY PLBAR1
C
C OPT = 1, CALLED FROM PLBAR1/EXTERN, 2, CALLED FROM SDRX
C SLT = PLOAD1 CARD
C V = REFERENCE VECTOR IN BASIC
C SA = OFFSET VECTOR IN BASIC POINT A
C SB = OFFSET VECTOR IN BASIC POINT B
C BA = BASIC COORD FOR POINT A
C BB = BASIC COORD FOR POINT B
C PA = LOAD VECOTR FOR POINT A
C PB = LOAD VECOTR FOR POINT B
C TA,TB = TRANSFORMATION MATRICES FOR A AND B ONLY USED WITH OPT 1
C EPT = POINTER TO EST
C
INTEGER OPT,OLDID,TYPE,SCALE,ISLT(7)
REAL LEN
DOUBLE PRECISION AX,AY,AZ,BX,BY,BZ,DX1,DX2,DL,DT,DFX1,DFY1,DFZ1,
1 DFX2,DFY2,DFZ2,S1,S2,S3,S4,S5,
2 I01,I11,I21,I31,I41,I02,I12,I22,I32,I42
DIMENSION V(3),SA(3),SB(3),BA(3),BB(3),PA(6),PB(6),EPT(32),
1 A(3),B(3),C(3),D(9),E(9),SLT(7),TA(9),TB(9),TP(3)
COMMON /MATOUT/ F,G
EQUIVALENCE (A(1),E(1)),(B(1),E(7)),(C(1),E(4))
DATA OLDID , D / 10*0 /
C
IF (OLDID .EQ. ISLT(1)) GO TO 20
OLDID = ISLT(1)
C
C CALCULATE AXIS AND LENGTH, AND THE E MATRIX
C
A(1) = BB(1)-BA(1) + SB(1)-SA(1)
A(2) = BB(2)-BA(2) + SB(2)-SA(2)
A(3) = BB(3)-BA(3) + SB(3)-SA(3)
LEN = SQRT(SADOTB(A,A))
IF (LEN .EQ. 0.0) GO TO 380
A(1) = A(1)/LEN
A(2) = A(2)/LEN
A(3) = A(3)/LEN
CALL SAXB (A,V,B)
C
TEMP = SQRT(SADOTB(B,B))
IF (TEMP .EQ. 0.0) GO TO 380
B(1) = B(1)/TEMP
B(2) = B(2)/TEMP
B(3) = B(3)/TEMP
CALL SAXB (B,A,C)
C
C TRANSVERSE SHEAR
C
TEMP = EPT(31)*EPT(17)*G*LEN**2
TMP = 12.0*F*EPT(18)
ALY = 0.0
IF (ABS(TEMP+TMP) .GT. 1.0E-14) ALY = TMP/(TMP+TEMP)
OMALY = 1.0 - ALY
C
TEMP = (TEMP/EPT(31))*EPT(32)
TMP = 12.0*F*EPT(19)
ALZ = 0.0
IF (ABS(TEMP+TMP) .GT. 1.0E-14) ALZ = TMP/(TMP+TEMP)
OMALZ = 1.0 - ALZ
C
C START BUILDING THE FORCES AND MOMENTS
C
20 TYPE = ISLT(2)
SCALE = ISLT(3)
X1 = SLT(4)
F1 = SLT(5)
X2 = SLT(6)
F2 = SLT(7)
I = (TYPE-1)/6 + 1
J = MOD(TYPE,6)
IF (J .EQ. 0) GO TO 60
GO TO (30,30,30,40,50,60), J
30 FX1 = A(J)*F1
FY1 = C(J)*F1
FZ1 = B(J)*F1
FX2 = A(J)*F2
FY2 = C(J)*F2
FZ2 = B(J)*F2
GO TO 100
40 FX1 = F1
FY1 = 0.0
FZ1 = 0.0
FX2 = F2
FY2 = 0.0
FZ2 = 0.0
GO TO 100
50 FX1 = 0.0
FY1 = F1
FZ1 = 0.0
FX2 = 0.0
FY2 = F2
FZ2 = 0.0
GO TO 70
60 FX1 = 0.0
FY1 = 0.0
FZ1 = F1
FX2 = 0.0
FY2 = 0.0
FZ2 = F2
70 J = 4
C
C SCALED
C
100 IF (SCALE.EQ.2 .OR. SCALE.EQ.4) GO TO 110
X1 = X1/LEN
X2 = X2/LEN
C
C DISTRIBUTED SCALED LOADS
C
110 IF (X1 .EQ. X2) GO TO 220
IF (SCALE.LE.2 .OR. J.EQ.4) GO TO 120
FSCALE = SQRT(1.0-A(J)**2)
FX1 = FSCALE*FX1
FY1 = FSCALE*FY1
FZ1 = FSCALE*FZ1
FX2 = FSCALE*FX2
FY2 = FSCALE*FY2
FZ2 = FSCALE*FZ2
C
C DISTRIBUTED LOADS
C
120 DX1 = X1
DX2 = X2
DL = LEN
DFX1 = FX1
DFY1 = FY1
DFZ1 = FZ1
DFX2 = FX2
DFY2 = FY2
DFZ2 = FZ2
S1 = DX2 - DX1
S2 = .5000000D0*(DX2**2 - DX1**2)
S3 = .3333333D0*(DX2**3 - DX1**3)
S4 = .2500000D0*(DX2**4 - DX1**4)
S5 = .2000000D0*(DX2**5 - DX1**5)
IF (I .EQ. 2) GO TO 140
C
C FORCES
C
I01 = DL*(S1-S2)
I11 = DL*(S1-3.0D0*S3 + 2.0D0*S4)
I21 = DL*( 3.0D0*S3 - 2.0D0*S4)
I31 = DL*(S2-2.0D0*S3 + S4)
I41 = DL*(S4-S3)
DT = DL*DL
I02 = DT*(S2-S3)
IF (F1 .EQ. F2) GO TO 130
I12 = DT*(S2-3.0D0*S4 + 2.0D0*S5)
I22 = DT*( 3.0D0*S4 - 2.0D0*S5)
I32 = DT*(S3-2.0D0*S4 + S5)
I42 = DT*(S5-S4)
DT = DL*(DX2-DX1)
BX = (DFX2-DFX1)/DT
BY = (DFY2-DFY1)/DT
BZ = (DFZ2-DFZ1)/DT
AX = DFX1 - DX1*BX*DL
AY = DFY1 - DX1*BY*DL
AZ = DFZ1 - DX1*BZ*DL
GO TO 170
130 AX = DFX1
AY = DFY1
AZ = DFZ1
GO TO 160
C
C MOMENTS
C
140 I01 = DL*(S1-S2)
I11 =-6.0D0*(S2-S3)
I21 =-I11
I31 = S1 - 4.0D0*S2 + 3.0D0*S3
I41 = - 2.0D0*S2 + 3.0D0*S3
IF (F1 .EQ. F2) GO TO 150
I02 = (S2-S3)*DL**2
I12 =-6.0D0*DL*(S3-S4)
I22 =-I12
I32 = DL*(S2-4.0D0*S3 + 3.0D0*S4)
I42 =-DL*( 2.0D0*S3 - 3.0D0*S4)
DT = (DX2 -DX1)*DL
BX = (DFX2-DFX1)/DT
BY = (DFZ2-DFZ1)/DT
BZ =-(DFY2-DFY1)/DT
AX = DFX1 + DX1*BX*DL
AY = DFZ1 + DX1*BY*DL
AZ =-DFY1 + DX1*BZ*DL
GO TO 170
150 AX = DFX1
AY = DFZ1
AZ =-DFY1
160 BX = 0.0D0
BY = 0.0D0
BZ = 0.0D0
I12 = 0.0D0
I22 = 0.0D0
I32 = 0.0D0
I42 = 0.0D0
C
C LOADS
C
170 PA(1) = I01*AX + I02*BX
PA(2) = I11*AY + I12*BY
PA(3) = I11*AZ + I22*BZ
PA(4) = 0.0
PA(5) =-DL*(I31*AZ + I32*BZ)
PA(6) = DL*(I31*AY + I32*BY)
DT = DL*DL
PB(1) = DL*S2*AX + DT*S3*BX
PB(2) = I21 *AY + I22 *BY
PB(3) = I21 *AZ + I22 *BZ
PB(4) = 0.0
PB(5) =-DL*(I41*AZ + I42*BZ)
PB(6) = DL*(I41*AY + I42*BY)
IF (I .EQ. 2) GO TO 190
IF (ALY .EQ. 0.0) GO TO 180
PA(2) = OMALY*PA(2) + ALY*( I01*AY + I02*BY )
PA(6) = OMALY*PA(6) + ALY*( I02*AY - I41*BY*DT)*.50
PB(2) = OMALY*PB(2) + ALY*(DL*S2*AY + S3 *BY*DT)
PB(6) = OMALY*PB(6) - ALY*( I02*AY - I41*BY*DT)*.50
180 IF (ALZ .EQ. 0.0) GO TO 300
PA(3) = OMALZ*PA(3) + ALZ*( I01*AZ + I02*BZ )
PA(5) = OMALZ*PA(5) - ALZ*( I02*AZ - I41*BZ*DT)*.50
PB(3) = OMALZ*PB(3) + ALZ*(DL*S2*AZ + S3 *BZ*DT)
PB(5) = OMALZ*PB(5) + ALZ*( I02*AZ - I41*BZ*DT)*.50
GO TO 300
190 TEMP = PA(1)
PA(1) = PA(4)
PA(4) = TEMP
TEMP = PB(1)
PB(1) = PB(4)
PB(4) = TEMP
IF (ALY .EQ. 0.0) GO TO 200
PA(2) = OMALY*PA(2)
PA(6) = OMALY*PA(6) + ALY*(I01*AY + I02*BY)
PB(2) = OMALY*PB(2)
PB(6) = OMALY*PB(6) + ALY*(DL*S2*AY + S3*BY*DT)
200 IF (ALZ .EQ. 0.0) GO TO 300
PA(3) = OMALZ*PA(3)
PA(5) = OMALZ*PA(5) + ALZ*(I01*AZ + I02*BZ)
PB(3) = OMALZ*PB(3)
PB(5) = OMALZ*PB(5) + ALZ*(DL*S2*AZ + S3*BZ*DT)
GO TO 300
C
C CONCENTRATED LOADS
C
220 TMP = 1.0 - X1
IF (I .EQ. 2) GO TO 230
C
C FORCES
C
TEMP = 1.0 - 3.0*X1**2 + 2.0*X1**3
PA(1) = TMP*FX1
PA(2) = TEMP*FY1*OMALY + FY1*TMP*ALY
PA(3) = TEMP*FZ1*OMALZ + FZ1*TMP*ALZ
PA(4) = 0.0
TEMP =-LEN*X1*TMP**2
TMP = TMP*LEN*X1*.50
PA(5) = TEMP*FZ1*OMALZ - FZ1*TMP*ALZ
PA(6) =-TEMP*FY1*OMALY + FY1*TMP*ALY
TEMP = 3.0*X1**2 - 2.0*X1**3
PB(1) = X1*FX1
PB(2) = TEMP*FY1*OMALY + FY1*X1*ALY
PB(3) = TEMP*FZ1*OMALZ + FZ1*X1*ALZ
PB(4) = 0.0
TEMP = (1.0-X1)*LEN*X1**2
PB(5) = TEMP*FZ1*OMALZ + FZ1*TMP*ALZ
PB(6) =-TEMP*FY1*OMALY - FY1*TMP*ALY
GO TO 300
C
C MOMENTS
C
230 TEMP =-(6.0/LEN*X1)*TMP
PA(1) = 0.0
PA(2) = TEMP*FZ1*OMALY
PA(3) =-TEMP*FY1*OMALZ
PA(4) = TMP*FX1
TEMP = 1.0 - 4.0*X1 + 3.0*X1**2
PA(5) = TEMP*FY1*OMALZ + FY1*TMP*ALZ
PA(6) = TEMP*FZ1*OMALY + FZ1*TMP*ALY
PB(1) = 0.0
PB(2) =-PA(2)
PB(3) =-PA(3)
PB(4) = X1*FX1
TEMP = 3.0*X1**2 - 2.0*X1
PB(5) = TEMP*FY1*OMALZ + FY1*X1*ALZ
PB(6) = TEMP*FZ1*OMALY + FZ1*X1*ALY
GO TO 300
C
C PIN FLAGS
C
300 CALL PLOAPF (EPT,EPT,LEN,PA,PB)
C
C LOAD VECTORS DONE FOR SDRX
C
IF (OPT .EQ. 2) GO TO 400
C
C TRANSFORM LOAD VECTOR TO GLOBAL
C
CALL GMMATS (E ,3,3,1,PA(1),3,1,0,TP )
CALL GMMATS (TA,3,3,1,TP ,3,1,0,PA(1))
CALL GMMATS (E ,3,3,1,PB(1),3,1,0,TP )
CALL GMMATS (TB,3,3,1,TP ,3,1,0,PB(1))
CALL GMMATS (E ,3,3,1,PA(4),3,1,0,TP )
CALL GMMATS (TA,3,3,1,TP ,3,1,0,PA(4))
CALL GMMATS (E ,3,3,1,PB(4),3,1,0,TP )
CALL GMMATS (TB,3,3,1,TP ,3,1,0,PB(4))
C
DO 310 I = 1,3
IF (SA(I) .NE. 0.0) GO TO 320
310 CONTINUE
GO TO 330
320 D(2) =-SA(3)
D(3) = SA(2)
D(4) = SA(3)
D(6) =-SA(1)
D(7) =-SA(2)
D(8) = SA(1)
CALL GMMATS (D,3,3,0,PA(1),3,1,0,TP)
PA(4) = PA(4) + TP(1)
PA(5) = PA(5) + TP(2)
PA(6) = PA(6) + TP(3)
C
330 DO 340 I = 1,3
IF (SB(I) .NE. 0.0) GO TO 350
340 CONTINUE
GO TO 400
350 D(2) =-SB(3)
D(3) = SB(2)
D(4) = SB(3)
D(6) =-SB(1)
D(7) =-SB(2)
D(8) = SB(1)
CALL GMMATS (D,3,3,0,PB(1),3,1,0,TP)
PB(4) = PB(4) + TP(1)
PB(5) = PB(5) + TP(2)
PB(6) = PB(6) + TP(3)
GO TO 400
C
C ERROR
C
380 CALL MESAGE (-30,31,OLDID)
C
400 RETURN
END
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