Concentrated force

A concentrated force acting at a node can be prescribed in any load case.

In the name.i2 file, a vector is first defined using a NV set:

NV set number T 6 V $F_x$ $F_y$ ; 2 components NV set number T 6 V $F_x$ $F_y$ $F_z$ ; 3 components NV set number T 6 V $F_x$ $F_y$ $F_z$ $M_\alpha$ $M_\beta$ ; 5 components NV set number T 6 V $F_x$ $F_y$ $F_z$ $M_x$ $M_y$ $M_z$ ; 6 components

depending on the number of components at the node, and the set thus defined is then assigned to the selected nodes:

AS load case number /$\dots$ /N set number N node number list /$\dots$

where

$F_x,F_y,F_z~[\text{N}]$ are the components of the force in the direction of the global axes,
$M_\alpha,M_\beta~[\text{Nm}]$ are the components of the moment on the edge of a semi-loof element, see the Reference Manual,
$M_x,M_y,M_z~[\text{Nm}]$ are the components of the moment in the direction of the global axes at the node of a beam element, see the Reference Manual.

Note
More than one assignment of concentrated forces to a single node may occur within a single load case. In that case, the force components are added together.

Example

Let us consider two NV sets with the identification numbers 1 and 2:

NV 1 T 6 V 0 1000 0
NV 2 T 6 V 5*0 500

The first set describes a force of $1~\text{kN}$ in the direction of the $y$ axis. The second set prescribes the moment $M_z=500~\text{Nm}$. The set NV 1 can be assigned to any node, the set NV 2 only to a node of a beam element.

The assignment might, for example, take the form

… /N 1 N 23 24 109/N 2 N 35/ …

in which case the force is assigned to nodes 23, 24, and 109, and the moment is assigned to node 35.

In this example, other assignments are also possible, for example

… /N 1 N 35/N 2 N 35/ …

In that case, both a force and a moment are assigned to node 35.