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Expert: - 3/8/2009


Question
Hi Arshad Khan
Many thanks for your reply
1.   In my previous question, I should better say seismic joint, instead of the expansion joint & this building is 350 m length to 35 m width & the structure frame is concrete.
2.    I want to know the max. distance between seismic joint in this project.
3.   If the allowable soil loading equal to 8.5 Kg/Cm2  & the site be in the  seismic zone=3, what is the suit distance between the columns & type of foundation (between raft and mat foundation) & height of each story.
4.   Do I should consider the cathodic safekeeping for the foundation, retaining wall & nailing armature.

Kind regards
M. Yadegari  

Answer
Hi Mehrdad,

1. Noted

2. This depends on where your main shear/core walls are. You should try and put joints at such places that each segment of the building is symmetrically restrained in both lateral directions, to avoid twisting due to seismic loading.

3. This depends on a lot of variables and I cannot advise you, I regret.

4. Again this depends on conditions on site, but in general cathodic protection for building is not required if you provide sufficient concrete cover and external tanking.

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Arshad Khan

Expertise

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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