Challenge

Reinforcement detailing of Columns from ETABS output

Aim 

     To create the  G+4 building in the ETABS and then to run the analysis and design the RCC Moment Resisting Frame in the structure 

Detailing rule of any reinforcement concrete member :

     1 Minimum reinforcement for shrinkage & temperature 

     2 Reinforcement required for limiting crack - width 

     3 Ultimate limit state design rebar requirement 

     4 Ductility rebar requirement 

  Among these Four Whichever is greater should be drawn in RC beam detailing 

 Minimum longitudinal reinforcement as per IS -13920 -2016 clause 6.2.1 As = 360 mm^2 

 Minimum shear/transverse reinforcement as per IS - 456 -2000 clause 26.5.1.6 (Assuming 1000 mm spacing in the formula ) Asv = 332 mm^2 

 Development length as per IS-456-2000 clause 26.2.1 Ld = 41 * diameter of bar 

Procedure            

   To create the  G+4 building in the ETABS and then to run the analysis and design the RCC Moment Resisting Frame in the structure 

   Thus by creating the structure in the ETABS wehave to run the analysis and then by selecting the 3 row in the structure we have select the two end coloumns in the structure 

  By clicking the option in All stories in the below property box we select the two end coloumns and then right click it -choose the selected object only in the property box and then two selected coloumns only visible in the structure the other coloumns are hidden in the structure 

 By selecting the object we go to the 3D view in the structure and then click the concrete frame design in the structure and then click the elevation and then select the view in logitudinal as well asin the shear 

Longitudinal reinforcement & shear reinforcement of coloumn at Grid - 3B from ETABS (450 * 650 )

Special confining reinforcement from IS-13920-2016 : Clause 8.1

L0 not less than

          1 Larger coloumn dimension 

          2 1/6 of clear span of coloumn                  650 mm 

          3 450 mm 

Confinement spacing not more than 

         1 1/4 of similar coloumn dimension 

         2 6 times of dia of coloumn main bar          100 mm 

         3 100 mm 

The amount of confinement rebar 

       Asb = Maximum of (0.18 Sc , h fck/fy (Ag/Ak-1)    169 mm^2 

                                    0.05 Sc , h fck/fy )

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