Civil Engineering/Anchoring in RCC

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Expert: Arshad Khan - 10/31/2009


Question
I have to anchor a roof truss in an existing RCC Beam..
(this is an issue it self  )
So the problem is that we are not getting the required clear ceiling height if we anchor the truss directly in the beam. So one solution was was to provide a steel column pinned into the beam and raise the hieght of the rafter as shown in the drawing.

We were planning to use an adhesive called hilti to anchor in the existing beam.
PLease do advise me on how do i go about designing this connection?

Any book which guides for connection between concrete beams and steel structures ?


Answer
Hi Syed,

There is no drawing attached, but in any case you should not just rely on an adhesive as that can fail due to concrete surface spalling. You should use Hilti anchor bolts, which are long enough to anchor well behind the main longitudibal rebar of the RC beam. For guidance on which diameter and length/types of bolts to use, refer to the appropriate Hilti manual from this website:

http://www.us.hilti.com/holus/modules/techlib/teli_results.jsp?type=Product_Tech...

Please ensure that you design not just for gravity loading, but also wind uplift as well as lateral loading caused by wind and thermal expansion/contraction.

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Arshad Khan

Expertise

I can answer any questions to do with 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: 35 years in Construction and consultancy in the UK, Kenya, Tanzania, Uganda, Ethiopia, Eritrea, South Africa, Somalia, Austria, Bahrain 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 .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 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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