r3cum3.F

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!||====================================================================
!||    r3cum3   ../engine/source/elements/spring/r3cum3.F
!||--- called by ------------------------------------------------------
!||    rforc3   ../engine/source/elements/spring/rforc3.F
!||====================================================================
      SUBROUTINE r3cum3(
     1   F,       FOR,     STI,     STIFN,
     2   DF,      EX,      EY,      EZ,
     3   EX2,     EY2,     EZ2,     NC1,
     4   NC2,     NC3,     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(*),NC3(*)
C     REAL
      my_real
     .   f(3,*), for(*),sti(3,*),stifn(*),df(*),
     .   ex(mvsiz),ey(mvsiz),ez(mvsiz),ex2(mvsiz),ey2(mvsiz),ez2(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),
     .   altmp
C-----------------------------------------------
C-------------------------
C     ASSEMBLE
C-------------------------
      DO i=1,nel
        f11(i)=ex(i)*(for(i)+df(i))
        f21(i)=ey(i)*(for(i)+df(i))
        f31(i)=ez(i)*(for(i)+df(i))
      ENDDO
C
c ... note:  dF = E*dF + dE*F.
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)
        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)
        stifn(nc2(i))=stifn(nc2(i))+two*sti(2,i)
      ENDDO
C
      DO i=1,nel
        f11(i)=ex2(i)*(for(i)-df(i))
        f21(i)=ey2(i)*(for(i)-df(i))
        f31(i)=ez2(i)*(for(i)-df(i))
      ENDDO
C
c ... note:  dF = E*dF + dE*F.
C
      DO i=1,nel
        f(1,nc3(i))=f(1,nc3(i))+f11(i)
        f(2,nc3(i))=f(2,nc3(i))+f21(i)
        f(3,nc3(i))=f(3,nc3(i))+f31(i)
        stifn(nc3(i))=stifn(nc3(i))+sti(3,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)
      ENDDO
C---
      RETURN
      END