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Related:Portal Frame Design - Steel Portal Frame - Portal Frame Analysis - Graphic Design Portal - Web Portal Design

Project Description¶

This project is fully done using Graphical User Interface (GUI).However it could be completely reproduced via text input - CADINP language. The intention of this tutorial is to guide you through asimple single-span portal frame project and introduce the general work-flow showing the necessary program tools and functions.Some theoretical background is given as well.

Geometry¶

The proposed frame is defined as shown below. The haunch length is assumed to be 10% of the span. The portal frames are spaced at 8 m centres.The cladding of the roof and walls is supported by purlins and side rails. The spacing of the girts and purlins, and the location of restraintsto the inside flanges, will be defined at the design stage.

Design code¶

This tutorial is based on EN 1993-1-1 and EN 1993-1-5.

Materials¶

Number	Grade	Notes
1	S 355 (EN 1993)	tf > 16 mm, thus fy = 345 MPa

Cross-sections¶

Number	Title	Notes
1	HEB 600	Column
2	IPE 500	Rafter
3	Haunch - 463 mm	IPE 500 + cutting of IPE 500 (average cutting depth 463 mm)
4	Haunch - 340 mm	IPE 500 + cutting of IPE 500 (average cutting depth 340 mm)
5	Haunch - 204 mm	IPE 500 + cutting of IPE 500 (average cutting depth 204 mm)
6	Haunch - 68 mm	IPE 500 + cutting of IPE 500 (average cutting depth 68 mm)

Loads¶

Number	Title	Action	Load Value
1	Self-weight	G (Permanent)	Automatically generated
2	Roof	G (Permanent)	4,4 kN/m
3	Snow	S (Variable)	3,2 kN/m
4	Imposed	Q (Variable)	4,8 kN/m
5	Wind	W (Variable)	See figure below
7	Imperfection	IMP (Imperfection)	Sway 19 mm (1/689), bow 1/300 (stress-free)

Loadcase 2 - Roof

Loadcase 3 - Snow

Loadcase 4 - Imposed

Loadcase 5 - Wind

(Figure taken from SCI P397: ELASTIC DESIGN OF SINGLE-SPAN STEEL PORTAL FRAME BUILDINGS TO EUROCODE 3)

Note

SOFiSTiK has a tool for an Automatic Wind Load Generation. A tutorial with this topic will be available soon.

See also

A detailed description regarding the topic Imperfections you will find in the tutorial Imperfection Concept.

Free Portal Frame Design Software

Load combinations¶

Free Portal Software

Number	Title	Permanent	Leading Variable	Accompanying Variable
1001	1.35G+1.35G+1.5Q+IMP	1.35	Imposed 1.5
1002	1.35G+1.35G+1.5S+0.75W+IMP	1.35	Snow 1.5	Wind 1.5 * 0.5
1003	1.35G+1.35G+0.75S+1.5W+IMP	1.35	Wind 1.5	Snow 1.5 * 0.5
1004	G+G+1.5W+IMP	1.0	Wind 1.5