r1cum3.F

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!||====================================================================
!||    r1cum3   ../engine/source/elements/spring/r1cum3.F
!||--- called by ------------------------------------------------------
!||    rforc3   ../engine/source/elements/spring/rforc3.F
!||====================================================================
      SUBROUTINE r1cum3(
     1   F,       FOR,     STI,     STIFN,
     2   FX1,     FX2,     FY1,     FY2,
     3   FZ1,     FZ2,     MX1,     MX2,
     4   MY1,     MY2,     MZ1,     MZ2,
     5   EX,      EY,      EZ,      NC1,
     6   NC2,     NEL)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   G l o b a l   P a r a m e t e r s
C-----------------------------------------------
#include      "mvsiz_p.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER, INTENT(IN) :: NEL
      INTEGER NC1(*),NC2(*)
C     REAL
      my_real
     .   F(3,*), FOR(*),STI(3,*),STIFN(*),
     .   FX1(MVSIZ),FY1(MVSIZ),FZ1(MVSIZ),
     .   fx2(mvsiz),fy2(mvsiz),fz2(mvsiz),
     .   mx1(mvsiz),my1(mvsiz),mz1(mvsiz),
     .   mx2(mvsiz),my2(mvsiz),mz2(mvsiz),
     .   ex(mvsiz),ey(mvsiz),ez(mvsiz)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I, J
C     REAL
      my_real
     .   F11(MVSIZ), F21(MVSIZ), F31(MVSIZ)
C-----------------------------------------------
      DO I=1,nel
        f11(i)=ex(i)*for(i)
        f21(i)=ey(i)*for(i)
        f31(i)=ez(i)*for(i)
c ... note:  dF = E*dF + dE*F.
      ENDDO
C-------------------------
C     ASSEMBLE
C-------------------------
      DO i=1,nel
        f(1,nc1(i))=f(1,nc1(i))+f11(i)
        f(2,nc1(i))=f(2,nc1(i))+f21(i)
        f(3,nc1(i))=f(3,nc1(i))+f31(i)
        fx1(i) = -f11(i)
        fy1(i) = -f21(i)
        fz1(i) = -f31(i)
        mx1(i) = zero
        my1(i) = zero
        mz1(i) = zero   
        stifn(nc1(i))=stifn(nc1(i)) + sti(1,i)
        f(1,nc2(i))=f(1,nc2(i))-f11(i)
        f(2,nc2(i))=f(2,nc2(i))-f21(i)
        f(3,nc2(i))=f(3,nc2(i))-f31(i)
        fx2(i) = f11(i)
        fy2(i) = f21(i)
        fz2(i) = f31(i)
        mx2(i) = zero
        my2(i) = zero
        mz2(i) = zero    
        stifn(nc2(i))=stifn(nc2(i)) + sti(2,i)
      ENDDO
C
      RETURN
      END