Civil Engineering/Euro code

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Expert: - 4/26/2011


Question
QUESTION: 1)What is favourable  & Unfavourable actions ? (Table A1.2 (A) Page no 54 of BS EN 1990:2002

2)How to consider seismic load factors while considering load combination in Euro code ?

3)Whether Annex A1 is applicable for buildings or Industrial structures? (Annex A1 Page no 51 of BS EN 1990:2002)

ANSWER: Hi Muthu,

1. Favourable action is when the overall stress on a member is reduced, and vice versa.

2. The load combinations must be mentioned in Eurocode- usually similar to what is mentioned for wind loading. Seismic load is already ultimate, so you do not need to apply a ULS load factor.

3. Sorry I do not have a copy of that code to advise.

---------- FOLLOW-UP ----------

QUESTION: I need more clarity:

For Q1) Suppose I have Self Weight of the Foundation, Dead weight of Platform & Dead weight of the Equipment. which one i need to be consider "Favourable Permanant action" which one not ? - please clarify ?

Q2) We don't have load combinations in BS EN 1990 as like Indian code IS 875 part5. But factors are mentioned in BS EN 1990(refer table A1.1 of BE EN 1990). My understanding is whatever we have wind factor in table A1.1 of BS EN 1990 same factor we can take for seismic factor - Please advise.

Answer
Hi Muthu,

1. In this case, unfavourable for overturning would be without dead weight of equipment, and vice versa. Similarly 1.0DL + 1.4WL would be unfavourable and 1.2 (DL+LL+WL) would be favourable.

2. Yes, you can use same factors as WL for DL and LL, except take 1.0 factor for seismic.

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Arshad Khan

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I can answer any questions to do with civil and structural engineering consultancy and construction industry in East Africa and the Middle East, and specifically with the analysis and design of reinforced concrete structures. My particular expertise is in the aseismic design and optimisation of tall buildings.

Experience

Employment history: 36 years in Construction and consultancy in the UK, Kenya, Tanzania, Uganda, Ethiopia, Eritrea, South Africa, Somalia, Zambia, Austria, Bahrain, Kuwait, Doha and the U.A.E.

Organizations
.Fellow of Institution of Structural Engineers (UK) .Fellow of Institution of Civil Engineers(UK) .Member of the Institution of Engineers, Kenya .Registered Engineer, ERB, Kenya .Member of the Architectural Association of Kenya (Engineers Chapter) .Chartered Engineer (UK)

Publications
•1984: International Conference on the Art and Practice of Structural Design, London •1994: 3rd Int. Kerensky Conference in Structural Engineering, Singapore •2008: International Conference on High-Rise Towers, Abu Dhabi

Education/Credentials
BSc, 1st Class Hons, in Building Engineering, University of Bath, UK MSc in Concrete Structures and Technology, University of London. Diploma of Imperial College, UK.

Awards and Honors
•Science Congress Special Award (for 2-seater Hovercraft - 1968) •Institution of Civil Engineers Award for outstanding performance at Bath University (1975) •Concrete Society Postgraduate study Bursary Award (1976) •Consular Representative for British High Commission, Nairobi. (1995 to 1998) •Examiner for Institution of Civil Engineers Professional Interviews, Nairobi. (1997 to 1998) •Branch Representative in Vienna for PI assessment for Inst. of Struct. Engrs. (1999 to date)

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