1D Elements

1D Elements

Line1ht element

Two node linear isoparametric element for for heat transfer problems. Each node has 1 degree of freedom. The cross section property “area” is requested from the cross section. The element geometry is specified in (x,y,z) plane. The element features are summarized in Table 53. Stabilization through lumped capacity matrix is suggested in transient transport problems, using lumped.

Fig. 22 Line1ht element in (x,y,z) space.

Table 53 Line1ht element summary

Keyword	Line1ht
Description	Line (truss-like) finite element with linear approximation for heat transfer problems
Parameters	NIP: allows to change the default number of integration point used.
Unknowns	Single dof (T_f - temperature) is required in each node.
Approximation	Linear approximation of temperature.
Integration	Integration using one point gauss integration formula.
Loads	Body loads are supported. Boundary loads are unsupported.
Features
CS properties	Area
Status	Reliable
Tests/Examples	tm/line01.in, tm/line02.in, tm/hydratingConcreteMat07.in

Line1mt element

Line (truss-like) finite element with linear approximation of moisture. Other features are the same as for Line1ht in Section Line1ht element.

Line1hmt element

Line (truss-like) finite element with linear approximations of temperature and moisture. Other features are the same as for Tr1ht in Section Line1ht element.