User`s Manual

Steel Portal Frame EC3 RUNET software

13.5 Loads

The program automatically forms and evaluates all the load combinations in ultimate limit state ULS (EQU,STR), and serviceability limit state SLS. The partial factors for loading and load combination factors are taken according to Eurocode 0 and National Annex. The basic loads are:

13.5.1 Permanent loads

 Load of roof covering [kN/m²] It includes the weight of the sheeting, purlins and insulation materials.

 Load of ceiling under the roof [kN/m²]

 self weight of frame elements, calculated by the program from the element cross sections with Unit mass ρ= 7850 Kg/m³

13.5.2 Variable loads

 Imposed load according to EN1990-1-1 Tab 6.1, calculated by the program according to the selected National Annex

 Snow load according to Eurocode 1-3:2004

The characteristic snow load on the ground sk is specified in kN/m2.

Click , and a special dialog window appear. In this window you set the snow zone and the height above the sea level.

The characteristic snow load on the ground is computed according to

Eurocode 1-3:2004, and the National

Annex. The snow region can be selected from Parameters/snow load on the ground. The snow load on the roof is computed according to Eurocode 1-3:2003.

 Wind load, according to Eurocode 1-

4:2005

The wind pressure on vertical surface is specified in kN/m2. Click and in this window you compute the wind pressure from the wind velocity and the topography of the region according to

Eurocode 1-4:2005.

The wind load is computed for various places at the roof and the vertical walls according to Eurocode 1-4:2005 §7.2.5 and Tab 7.4a and Tab. 7.1.

The wind region, which specifies the wind velocity, is selected from Parameters/Basic wind velocity.

Wind internal pressure wi in kN/m2. This is internal pressure and it acts from inside outwards on the walls and roof. It is subtracted directly (without further multiplication by pressure coefficients) from any uplift wind pressure on the outside surfaces.

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