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REINFORCING DETAILS OF RCCCOLUMN &FOOTING
Column• Columns are vertical compression members  of a structural frame intended to support the  load-carrying beams. They...
• The main reinforcement in columns is longitudinal, parallel to the direction of the load and consists of bars arranged i...
• Main steel is provided to resist compression load  along with concrete• Reinforcement Requirements (Longitudinal Steel  ...
• The object of stipulating a min. percentage of  steel is to make provision to prevent buckling of  column due to any acc...
• Min. 4 bars in rectangular/square column and min. 6  bars in circular shape column• The bar shall not be less than 12mm•...
• Spacing of longitudinal bars shall not exceed  300mm from the periphery of the column• in our site they provided rectang...
• - the no. of bars in a column are varying from 10,  12,14, 16, of varying diameter• They provide different diameter main...
TRANSVERSE REINFORCEMENT • In order to maintain the position of longitudinal   reinforcement and also to prevent their buc...
• In our site they provided lateral ties of diameter  8mm at a spacing 200 and 250mm c/c
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Reinfocing details of column

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Reinfocing details of column

  1. 1. REINFORCING DETAILS OF RCCCOLUMN &FOOTING
  2. 2. Column• Columns are vertical compression members of a structural frame intended to support the load-carrying beams. They transmit loads from the upper floors to the lower levels and then to the soil through the foundations.• Usually columns carry bending moment as well, about one or both axes of the cross section, and the bending action may produce tensile forces over a part of the cross section• Reinforcement are provided in order to reduce the size of the column
  3. 3. • The main reinforcement in columns is longitudinal, parallel to the direction of the load and consists of bars arranged in a square, rectangular, or circular shape
  4. 4. • Main steel is provided to resist compression load along with concrete• Reinforcement Requirements (Longitudinal Steel Ast) min Ast 0.8 % of C/S max Ast 6% of C/S
  5. 5. • The object of stipulating a min. percentage of steel is to make provision to prevent buckling of column due to any accidental eccentricity of the load on it• For stipulating a max. percentage of steel is to provide reinforcement with in such a limit to avoid congestion of reinforcement which would make it very difficult to place the concrete and consolidate it
  6. 6. • Min. 4 bars in rectangular/square column and min. 6 bars in circular shape column• The bar shall not be less than 12mm• The nominal cover shall any case not be less than 40mm.• In our site they provided 40mm cover• Min. distance b/w individual bars -the dia of larger bar -5mm more nominal max. size of coarse aggregate
  7. 7. • Spacing of longitudinal bars shall not exceed 300mm from the periphery of the column• in our site they provided rectangular and circular columns• For rectangular column• -distributed the reinforcement equally on four sides
  8. 8. • - the no. of bars in a column are varying from 10, 12,14, 16, of varying diameter• They provide different diameter main bars i.e., 16mm,20mm,25mm• In our site 450mm dia. circular column Is used• For circular column they provide 6 nos 20mm dia. And 6 nos 16mm dia• The effective length provide is 48 times the dia . Of bar
  9. 9. TRANSVERSE REINFORCEMENT • In order to maintain the position of longitudinal reinforcement and also to prevent their buckling which may cause splitting of concrete. It is also assist confining the concrete • The diameter of transverse reinforcement shall not be less than 1/4th dia. of main bar in no case less than 5mm • The spacing of lateral ties the least lateral dimension of the column/16times the dia. Of main bars max spacing is 300mm
  10. 10. • In our site they provided lateral ties of diameter 8mm at a spacing 200 and 250mm c/c

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