Introduction 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.

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Introduction to EC3

When would a designer need to refer to BS EN 1993-1-5 and its UK National Annex?

When determining snow loads
When calculating the resistance of the webs of rolled sections
When selecting a steel sub-grade
For design guidance on stainless steel

Having calculated the non-dimensional slenderness, how might the reduction factor, χ be determined?

Using the expressions given in EN 1993
Using the figure given in EN 1993
Using look-up tables in NCCI
Using look-up tables in EN 1993

When calculating the buckling resistance of a member what is the value of the partial factor, γM1 specified in the UK National Annex?

1.0
1.05
1.1
1.15

What does a value of αcr = 11 indicate?

A very sensitive frame
That second-order analysis must be used
That the second-order effects are small enough to be ignored
That the approximate allowances for second-order effects cannot safely be used

How is ε calculated?

No need; it's given in the tables
ε = (235/fy)1/2
ε = (275/fy)1/2
ε = (355/fy)1/2

In flexural buckling, what non-dimensional slenderness is approximately equivalent to a slenderness L/ryy = 200?

0.5
1.5
2.5
3.5

When can the Eurocodes be used?

When Approved Document A in the Building Regulations is revised
Only when the client specifies design to the Eurocodes
Immediately
Only for projects outside the UK

Which of the following increase the risk of brittle fracture?

Colder temperatures
Tension
Thicker steelwork
Higher strain rates

Which country's National Annex should be used?

No NA is needed if the recommended values are chosen
The NA for the country where design is carried out
The NA for the country where construction is to be carried out
The choice of NA should be specified by the client

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