Nonlinear Finite Element Analysis of Concrete Structures

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force vector due to initial stresses, eq.
(4.3-25);
force vector due to initial stresses in reinforcement.
This vector relates to the nodal
points of the triangular element in question,
see eq. (4. 3-30) ;
force vector for a bar element due to initial
strains. Local coordinates are use, see eqs.
(4.3-10) and (4.3-12);
force vector for a bar element due to initial
stresses. Local coordinates are used, eq.
(4.3-26);
shear modulus;
first invariant of the stress tensor;
invariant of the stress tensor;
second invariant of the stress deviator tensor,
eq. (2.1-2);
= third invariant of the stress deviator tensor;
parameter, eq. (4.2-22);
stiffness tensor of the element, eqs. (4.1-19)
and (4.1-2C);
stiffness matrix of the element, eq. (4.2-12);
total stiffness matrix, eq. (4.6-1);
stiffness matrix in local coordinates of a bar
element, see eqs. (4.3-10) and (4.3-11);
stiffness contribution due to reinforcement.
This contribution relates to the nodal points
of the triangular element in question, see
eq. (4.3-2);
parameter in failure criterion, eq. (2.1-8 ;
parameter in failure criterion, eq. (2.1-8);
transformation matrix relating local and global
coordinates, eqs. (4.3-13) and (4.3-14);