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.

Good luck

Introduction to EC3

Which of the following statements about columns in 'simple construction' are correct?

Only open sections (UKC) can be used
Design moments in the columns are based on nominal eccentricities
Beams are designed as simply supported
The approach cannot be used in Eurocode design

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

Must all connections be classified by calculation?

No, classification by experience of satisfactory performance is permitted
Only for elastic design
Only for plastic design
Only if being used outside the UK

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 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

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

When might the typical 25% increase in LTB resistance (EC3, compared to BS 5950) be of particular value?

When the design is governed by deflection
In composite construction
When floor dynamics is a critical check
All other cases

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

The recommended value of 0.85
0.925
0.950
0.875

Which forms of buckling might apply to a UKC, subject to an axial compression and a bending moment?

Flexural
Torsional
Torsional-flexural
Lateral-torsional

Which of the following increase the risk of brittle fracture?

Colder temperatures
Tension
Thicker steelwork
Higher strain rates