# Line-line connection (Geometry)

Contents
 Line-line connection property Description Icon Modules where available Motion component Parallel with Global Z axis in Arbitrary direction in Global XY plane in Arbitrary direction in Rotation component Arbitrary direction in Global XY plane in Not available in Arbitrary direction in Geometry Straight or curved reference lines Available analysis results Connection forces and moments Default Short Command CLN

With the Line-line connection command, different connections can be defined between two regions having different positions in 3D (so not having common parts in the geometry model). Some typical examples:

• Hinged connection between regions having a gap
• Slabs on different level
Instead of connecting two slabs with a Wall element, the connection can be modeled with the Line-line connection tool (if the internal stress and other results are not required in the wall).

Definition steps

1. Start  Line-line connection command from tabmenu and choose  Define.

2. Set the properties of the new connection at  Default settings. See the settings possibilities and options at Properties (Non-Linear Behaviors).
 Applying a connection different from rigid state, the Interface position (r) is very important.r = distance between connection position and start point of definition / distance between start and end points of connection
 The figure shows two different interface positions at hinged line-line connection between two plate regions: in the first example, the hinged line (the place of the interface) is on the edge of the left plate (rs=re=0), and in the second example the interface position is in the middle (rs=re=0.5). In both examples, the left plate is supported rigidly and the right one has simple support against to Z-directional motion. The Mx moment diagrams show zero moments where the interface positions are placed.

In the settings dialog of a curved line support, the support direction has to set fixed or variable along the support’s reference line.

3. Set the system for the direction of the connection components.
4. Choose a geometry definition method for the first connection object’s reference line (axis).
5. Select the first object you would like to connect.
6. Define the first connection line object in the model view based on the chosen geometry method.
7. Choose a geometry definition method for the second connection object’s reference line (axis).
8. Define the second connection line object in the model view based on the chosen geometry method.

Optional steps:

1. Modify the connection properties with the  Properties tool of the tool palette.
2. Add members to a selected connection or remove members from it with  Edit connected objects.
3. Set the display settings of connections at Settings > All > Display > Connections. See the possibilities at Point-point connection.
4. The connections are stored on “Modeling tools” Object layers. At layer settings, the default color defines the connection label color.