RFEM – Online Manual

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RFEM – Online Manual

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11.8.5.1 Vertical walls

Vertical walls

Figure 11.196 Generate Wind Loads - Vertical Walls dialog box (roof geometry: Duopitch roof)

First, define the standard and, where applicable, the national annex in the Velocity Pressure dialog section. This setting controls, which text boxes can be accessed.

The wind zone and terrain category can be selected graphically in a map that you can open with the button. The structure height h is not automatically transferred from the model; it must be specified. Based on your settings, RFEM determines the basic value of the fundamental wind velocity vb,0.

Click the button to access more coefficients for determining wind loads.

Figure 11.197 Coefficients for Wind Load Generation dialog box

The walls are determined by means of the Base Geometry (nodes I to L for base area, bottom) and the Roof Type and Geometry (nodes A to D or F for roof planes, top). In case of roof overhangs, specify the upper wall nodes, not the roof nodes. As shown in the dialog graphic, wind loads can be generated for building objects closed on all sides with a quadrilateral base area. When entering geometry, note that the start nodes I and A must lie on top of each other and that the "direction" must be consistent when determining the base and roof area. You can use the and buttons to graphically define the base and roof geometry.

In the Load Case to Generate dialog section, enter the load case number for the load generation. With the button, you can create a wind load case.

The wind direction is defined in the Set Wind on Side dialog section. The wind acts perpendicular to the specified line.

If surfaces are available in the model, you can use the options in the Create Load Type dialog section to decide whether member or surface loads will be generated.

The Load Distribution Type and Remove Influence from dialog sections are described for the Member Loads From Area Load via Plane generator function.

Click the button to open the Settings for Load Generation dialog box (see Figure 11.178).

After confirming the generator dialog box with [OK], RFEM displays the results of the load generation in an overview. Thus, the acting area loads can be compared with the converted loads. Before the loads are transferred to RFEM, you can click the button to access the initial dialog box where you can change the parameters of the loads.