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Internal Hinges

The frame "Internal hinges" contains a table with the list of internal hinges. Adding (editing) internal hinges is performed in the "New internal hinges" dialog window. The dialog widow serves to define the line number of the internal hinges location and type of internal hinge (free, spring).

The internal hinge is a boundary condition that allows for the introduction of independent rotation about the x and y axis between the two parts of the slab along a specified line while keeping the vertical deflection along this line the same. The internal hinge can be prescribed along an arbitrary line creating a boundary between two macroelements. The rotation can be either free or controled by the spring torsional stiffness Kϕ,T.

Internal hinges can also be introduced using the mouse. This inputting mode is activated by clicking an appropriate button on the horizontal tool bar "Internal hinges". The following modes are available:

  • Add

Clicking the left mouse button on the desktop introduces the internal hinge location. Adding internal hinge is performed in the "New internal hinge" dialog window.

  • Modify

Clicking the left mouse button on already existing internal hinge opens the "Modify properties of internal hinge" dialog window, which allows for modifying its parameters.

  • Remove

Clicking the left mouse button on the internal hinge opens the remove internal hinges dialog window - accepting this action removes the selected internal hinge.

  • Select

Clicking the left mouse button on the internal hinge highlights the selected internal hinge. The internal hinge is simultaneously marked in the table list. The option allows for editing several internal hinges at once (e.g. deleting).

The input internal hinges can also be edited on the desktop with the help of active objects.

  Frame "Internal hinges"

Dialog window "New internal hinge"