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

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

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

Flexural
Torsional
Torsional-flexural
Lateral-torsional

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

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

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

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

If a web is Class 3 and a flange is Class 1, what Class is the section?

There must be some mistake; both elements should be the same Class
Class 1
Class 2
Class 3

Which of the following increase the risk of brittle fracture?

Colder temperatures
Tension
Thicker steelwork
Higher strain rates

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