Worked examples to EC3 quiz

Please answer the following 10 multiple choice questions, then click 'submit' to check the result. The pass mark for a CPD certificate is 8 out of 10, and you may retake the quiz as many times as you wish, but the questions will vary! Please note that one, two, three or all of the possible answers presented for each question may be right, and to gain a mark for that question all correct answers must be identified.

Good luck

Worked examples to EC3

Which approach to lateral-torsional buckling of UKB is recommended for manual calculations in the UK?

The general method
The simplified assessment method
Buckling curves - the general case
Buckling curves - for rolled sections and equivalent welded sections

Which combination of checks are required for elements in tension?

Gross area using yield strength, and γM0
Gross area using yield strength, and γM1
Net area using yield strength, and γM1
Net area using ultimate strength and γM2

In flexural buckling, what non-dimensional slenderness is approximately equivalent to a slenderness L/ryy = 160?

1.0
2.0
3.0
4.0

What value of ξ is specified in the UK National Annex?

The recommended value of 0.85
0.925
0.950
0.875

For designs to be constructed in the UK, where should the steel strength be taken from?

The designer may choose
The UK National Annex to BS EN 1993-1-1
The product Standard
BS EN 1993-1-1

Which bending modulus should be used with a Class 2 section?

Elastic modulus
Plastic Modulus
Effective Modulus
Young's Modulus

What structural mechanics is allowed for in the C1 factor when calculating Mcr?

The influence of the axial load
The influence of residual stresses
The shape of the bending moment diagram
Initial imperfections in the member

How is ε calculated?

No need - its given in the tables
ε = (235/fy)1/2
ε = (275/fy)1/2
ε = (355/fy)1/2

In expressions 6.61 and 6.62, what structural mechanics do the k factors account for?

The residual stresses in the member
The shape of the bending moment diagram
The influence of the axial load
The section shape

Which class of sections use the Gross Area, A when calculating the resistance?

Class 1
Class 2
Class 3
Class 4