Nodes

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MainMenuAndMainIconsNODES

 

Nodes connect Elements. Each Element has a Start Node (i) and an End Node (j). Each node is located at a (X, Y) Point (Global Axes) in the 2D plane and it has 3 Degrees Of Freedom (DOFs):

 

dof_1 X-Displacement

dof_2 Y-Displacement

dof_3 Z-Rotation

 

Each DOF can be:

Free to move (No support = No , No spring)

Fixed (Constrained, not able to move at all)

With spring on (Given the spring stiffness, the spring provides a reaction force that is proportional to the deflection of the corresponding DOF)

 

Node properties

The Node properties are the following:

Coordinates: X, Y

Constraints: DX-Con, DY-Con, RZ-Con (Each checked or Not)

Springs stiffness: DX-Stiff, DY-Stiff, RZ-Stiff

 

nodes1

 

Coordinates

Each node is located at a (X, Y) Point (Global Axes) in the 2D plane.

 

Constraints

The properties DX-Con, DY-Con, RZ-Con determine whether the corresponding DOF of the Node is constrained or not.

 

Each DOF can be:

Free (0 - Unchecked), or

Fully constrained (1 - Checked).

 

As a result, there are in total 8 types of Nodes:

 

Picture  

DX-Constraint  

DY-Constraint  

RZ-Constraint  

Description  

elefthero

NO

NO

NO

Free Node (000)

KILISI_Y

base_checkmark_32

NO

NO

y-Roller (100)

KILISI_X

NO

base_checkmark_32

NO

x-Roller (010)

ARTHROSI

base_checkmark_32

base_checkmark_32

NO

Pinned (110)

PAKTOSI

base_checkmark_32

base_checkmark_32

base_checkmark_32

Fixed (111)

kil_pa_xy

NO

NO

base_checkmark_32

(001)

KIL_PA_Y

base_checkmark_32

NO

base_checkmark_32

(101)

KIL_PA_X

NO

base_checkmark_32

base_checkmark_32

(011)

 

 

Springs

The properties DX-Stiff, DY-Stiff, RZ-Stiff determine the Stiffness of the Spring (Elastic constant) of the corresponding DOF. A spring provides a spring reaction force that is proportional to the deflection at the corresponding DOF.

 

Note: A DOF that has a spring should not be constrained, as there is no point in that. In any case, if for a given DOF there is a spring and it is also constrained, then the spring is ignored and the DOF is handled as constrained.

 

Add new Node

To add a new Node, type the X and Y Coordinates of the Node and click the "Add new Node" button.

 

Edit an existing Node

You can click on the table and you can easily edit the properties of an already existing Node. Any change you make is automatically reflected to the Model.

 

Actions for selected Nodes

In order to perform these actions, you have to first select the entire row(s) of the corresponding Nodes(s) and then apply the action.

Set Constraints: Select the proper constraints and then click the "Set" button. You can Set Constraints for more than one Nodes at a time.

Move or Copy Node(s): Give the Move/Copy Vector {V}={dX, dY}, select "Move" or "Copy" and then click the "Apply" button. You can Move or Copy more than one Nodes at a time.

Delete Node(s): Click the "Delete" button. You can Delete more than one Nodes at a time.

 

nodes2

 

Nodes selection tools

This tab provides tools for the selection of Nodes. For example, you can select (add to selection) or deselect (remove from selection) all the Nodes that are connected to Elements, or all the Nodes that are NOT connected to Elements. This is useful when for example you need to Delete all the Nodes of the Model that are not connected to Elements.

 

nodes3