Create and run floor vibration checks

To establish the response of the floor to dynamic excitation you can apply a floor vibration checks. These are applied over a user-defined rectangular or polygon shaped slab area by using the Vibration Check command in the Floor Vibration group. In order to create the check, you need to identify a primary beam, secondary beam and critical slab item. In addition, you must specify associated data in order to perform the floor vibration calculation.

Create floor vibration check items

Floor vibration check items are the objects to which the floor vibration check information and calculations are attached.

Note:

Floor vibration check items can only be created in 2D Views.

Go to the Design tab on the ribbon and click Vibration Check.
Go to the Properties window.
In FloorPlateDefinition, select whether you want to create a rectangular or polygonal slab.
1. If you selected the Rectangular option, adjust the local x angle to define the angle at which the rectangle will be drawn, if necessary.
To create a check area, in the model, do one of the following depending on the slab shape:
- Rectangular: Click once to define the first corner of the rectangle, and again to define the opposite corner.
- Polygon: Click to define the corners of the polygon. In order to close the shape, click the first point again.
Click to define the primary beam.

The primary beam properties appear in the Properties window.
Click to define the secondary beam.

The secondary beam properties appear in the Properties window.
Click to define the critical slab item.

Note:
If the critical slab item is a composite slab, Tekla Structural Designer automatically defines the slab item properties. In other cases, you need to input the properties yourself.

The critical slab item properties appear in the Properties window.
In the Properties window, review and adjust the check item properties.
Click anywhere in the model to create the check item.

Tekla Structural Designer highlights the primary beam, secondary beam and critical slab item of the current check item.
Create new checks, or press Esc to finish creating floor vibration check items.

Create floor vibration checks that consider two or three adjoining spans

Creating two-span or three-span floor vibration checks is almost identical to that required for single spans. When creating the check item, do the following:

In the Properties window, set the Adjoining Spans property of a primary and/or secondary beam to Two span or Three span.

Note:

If the Two span option is selected, note the following:

When you hover the mouse pointer to select the beam, only beams of two or more spans are available.
When a beam is highlighted, note that the beam directly under the mouse pointer will become the critical beam, and the second highlighted beam will become the adjoining beam.
The second highlighted beam (the adjoining beam) will be the beam closest to the mouse pointer position. That's why, in order to highlight the adjoining beam at a particular end of the critical beam, you can move the mouse pointer toward that end of the critical beam.

Note:

If the Three span option is selected, note the following:

When you hover the mouse pointer to select the beam, only beams of three or more spans are available to be highlighted,
When a beam is highlighted, note that the beam directly under the mouse pointer will become the critical beam, and the second highlighted beam will become the adjoining beam.
The second highlighted beam (the adjoining beam) will be the beam closest to the mouse pointer position. That's why, in order to highlight the adjoining beam at a particular end of the critical beam, you can move the mouse pointer toward that end of the critical beam.

Modify the properties of existing floor vibration check items

In Scene Content, ensure that Floor Vibration Checks have been turned on.
Hover the mouse pointer over the slab area where the floor vibration check item lies.

The Select Entity tooltip appears.
Navigate to the floor vibration check item name by using the arrow keys, and click Enter.

The floor vibration check properties appear in the Properties window.
In the Properties window, adjust the check item properties according to your needs.

Check vibration for all floor vibration check items

Go to the Design tab on the ribbon and click Check Floor Vibration.

Tekla Structural Designer performs floor vibration checks for all floor vibration check items in the model.

Check floor vibration for an individual floor vibration check item

Hover the mouse pointer over the floor vibration check item that you want to check.

The Select Entity tooltip appears.
If necessary, navigate to the floor vibration check item name by using the arrow keys.
Right-click the check item.
In the context menu, select Check Floor Vibration.
Tekla Structural Designer displays the results of the design in a new dialog box.