Saturday 18 April 2020

Tips for Design of RCC Beams for construction

If you are new to the design of RCC beams or any structural members you might find it difficult because what we learn from books during civil engineering studies is different from what is practiced in the construction field. You shouldn’t worry “that” much because both analyzing and designing of structural members is easy once you understand industrial practices and get some experience. Here I am going to give a few tips for the design of RCC Beams.
Tips for Sectional Design of RCC Beams
  1. Keep the width of the beam minimum. Some commonly used beam widths are 200, 230 and 300 for practical, structural and aesthetic reasons.
  2. For Plinth, beams assume overall depth from span/15 to span/18
  3. For Tie, beams assume overall depth from span/18 to span/20
  4. For Floor, beams assume overall depth from span/12 to span/15
  5. Design the section based on the maximum moment and shear force.
  6. Mu/bd^2 can go up to 6 in case of the heavy beam with long spanDesign of RCC Beam and column in buildings
                                     Pic:- Amaravathipudur, Andra Pradesh

Tips for Reinforcement Design of Beams

  1. Use smaller sized bars for good efficiency.
  2. For simply supported beam at least 1/3 of positive reinforcement should extent along the same face of the member into support to the length equal to Ld/3
  3. In case of the continuous beam at least 1/4 of positive reinforcement should extend along the same face of the member into support to the length equal to Ld/3
  4. The maximum spacing of stirrups shall be 0.75 times the effective depth so restrict the spacing of the stirrups to 225mm. (300*0.75=225)
  5. Curtailment length shall be checked with the development length
  6. When using two lines of reinforcement keep the larger diameter bars on the outer layer for maximum efficiency
  7. Provide hanger bars at the intersection of Main and Secondary beam for a cushion.
  8. Check the torsion of the main beam when the secondary beam rests on it.
  9. Increase the reinforcement in the support and increase the developmental length by 25% in case of the cantilever
  10. Learn to use T-Beam and L-beam design, if possible, for maximum design and cost efficiency and to avoid compression reinforcement.
Er.SP.ASWINPALANIAPPAN., M.E.,(Strut/.,)
Structural Engineer
Madras Terrace Architectural Works
www.civilbaselife.blogspot.in

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