Civil Engineering/Beam Design

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Question
beam design
beam design  
Dear Sir

thanks for the masonry details quite helpful.

my question is how do i design beam A and Beam 1 in the attached image? my thoughts are, i should choose one of the beams to be secondary beam so it will be a point load on the other beam! but my other question is how do we treat the circled joint example if i choose beam A to be a secondary beam then it will be a point load on the circled joint to beam 1 but will i consider any existence of support on beam 1 at this point or just the two columns and no support at the joint just the point load?

thanks a lot.

Answer
Hi Manka,

You should consider Beam A as main beam as it is shorter span and therefore stiffer as far as deflection is concerned. Then you can consider the reaction from Beam 1 as point load. Ensure that the bottom rebar of Beam A is lower than the bottom rebar of Beam 1 at the cross-over. It would be far better, to avoid rebar clash, to make Beam A about 50mm deeper than Beam 1. Then for Beam 1, you can consider a support at mid-span.

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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: 40 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 •2013: IEK International Conference, Kisumu, Kenya

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 2010)

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