Steel Beam Design Flashcards
What Eurocode governs steel design?
EC3
What is a variable action in steel design?
A live load or imposed load
What term replaces ‘loads’ in steel design?
Action(s)
What partial factors are used for steal beam loads?
The same as in concrete, 1.35 for dead loads & 1.50 for live loads
In loading for steel beams, the subscript G denotes…?
The subscript Q denotes…?
G = permanent action (dead load)
Q = variable action (live load)
How is ultimate loading calculated?
The same as normal, except with point loads and UDL’s considered.
How is bending moment calculated when there is a UDL and a point load in the centre of the beam?
( WL^2 / 8 ) + ( PL / 4 )
How is shear force calculated when there is a UDL and a point load in the centre of the beam?
( WL / 2 ) + ( P / 4 )
What is Med in steel beam design?
The max bending moment of a steel beam
What is Ved in steel beam design?
Max shear force in the steel beam
How is the thickness of steel grade decided?
Using the grade of steel given in the question and Table S1
How is W (plastic modulus) required calculated?
What units should this be in?
Med / Fy
Cm^3
How is W obtained?
Using the required value (cm^3), choose the closest, but greater value to the required, from the ‘Interactive Blue Book’
Where are the section properties from the steel beam selected?
Section properties are found from the interactive blue book, based on the W used value
Where is the epsilon value (curvy E) obtained?
Table S2
How is local buckling, c, in the outstanding flange calculated?
c = ( b - Tw - 2r ) / 2
How are the flange and web classified?
Using the c value calculated (flange) and the d value (web) from the ‘interactive blue book’ in combination with table S3
What is the overall classification if both flange and web are class 1?
Overall cross-section classification is class 1
How is the formula for bending resistance of a cross-section chosen?
Using table S4 in combination with the class of the cross-section
When calculating bending resistance, what units are produced?
What is Ymo equal to?
Nmm
1.0 (from UK national annex)
How is bending tested?
Bending resistance must be greater than Bending action (Med)
In shear resistance of a cross-section, where is Av obtained from?
Part 3A of table S5
What value must Av not be less than?
N x Hw x Tw
How is shear resistance of cross-section tested?
It must be greater than the maximum shear action (Ved) calculated.
How is deflection tested?
Actual deflection must be less than permissible deflection
In actual deflection, what must be different in load calculations?
They must remain unfactored
