Explanatory script ………………………………………………………………………….. 3
Initial data ………………………………………………………………………………….. 4
1. Design of the deck beams …………………………………....………………………….. 5
First variant …………………………………….………………………………………… 5
Second variant …………………………………….………………………….………….. 6
2. Design of the main beams …………………………………….…………………………. 9
2.1 Reducing the cross-section of main beam …………………………………………... 12
2.2 Designing butt welds in the changed cross-section …………………………………. 13
2.3 Shear strength of cross-section …………………………………...…………………. 14
2.4 Designing flange welds connecting the flange and the web ………………………… 14
2.5 Verification of local stress ……………………………………….………………….. 15
2.6 Lateral stability of web ……………………………………………………………… 15
2.7 Local stability of web..... ………………………………………...………………….. 15
2.8 Design of beam supports ………………………………………...………………….. 17
3. Design of axially loaded columns ………………………...……………………………... 19
3.1 Design of column head ………………………………………….…………………... 21
3.2 Design of column foot …………………………………………..…………………... 22
3.3 Bending moments in sections 1, 2, 3 ……………………………...………………… 23
3.4 The depth of the cross-member …………………………………...………………… 23
4. Drawings ……………………………………………………………………………..….. 25
5. Literature ………………………………………………..….………………………..............
Explanatory script
The main purpose of this course work is to design steel frame of a structure. To determine the required cross-sections of main and deck beams. Calculate various weld properties between elements.
It contains from such main elements:
• The metal deck;
• The deck beams;
• The main beams;
• Axialy loaded columns.
The deck beams are I shaped IPE220, main beams are welded from steel plates with reduced cross-section at the sides. Columns are made from HEA200. The column head and foot are design with required welds to other elements. Fillet welding using electrode wires is choosed, welding protecting by gas – G38.
The height of a steel frame is 5.4 m, length – 11 meters and width – 3.5 meters. Width and length is between axis of symetry of columns. The steel class used in this course work is S235. Concrete class C16/20.
Initial data
No.
Name Surname
L
B
level
Steel
Column
1
Martina Andruytė
11
3.5
5.4
S235
I shape
No.
Load
Characteristic load (kN)
γQ
Design load (kN)
1.
Thickness of steel plate
t=160mm
4
1.35
5.4
2.
Live load
5
1.3
6.5
1. Design of the deck beams
First case:
According obtained results I select IPE 180 beam with following characteristics:
Condition is satisfied
Checking shear resistance condition:
Condition of beam deflection:
Condition satisfied.
Second...

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