Analysis & Design of RCC shear walls in the model using ETABS

AIM-The etabs file for a G+6 building is provided. Run the analysis and design the RCC shear walls (show in the etabs model). The following challenge deals specifically with the shear wall of size 300x1500 at grid A-11 in the structural model.

Guid

Procedure-

• Guide Line for shear wall detailing
• Minimum reinforcement for shrinkage & temprature
• Ultimate Limit state design rebar requirement 
• ductility rebar requirement 

Note- Whichever is greater should be drawn in the Rc shear wall detailing 

• Classification of shear wall as per IS-13920-2016 clause 10.1.4 (slender wall)

Hw/Lw=21000/1500

              14 >2

Minimum net vertical reinforcement as per IS-13920-2016 Table 1 (iii) 23633 mm^2

=0.0025+0.01375(300/15000)

Minimum vertical reinforcement within boudary element Table -1 (iii)

• 1440 mm^2 on left ( 600mm Width Boudary element
• 1080 mm^2 on right (450 mm width boundary element )

Minimum horizontal reinforcement in shear wall as per IS 13920-2016 Table-1 (iii)

rho h =750(300x1000)=0.0025 hw

             = 0.0025+0.5(21/15-2)x0

(rho )min =0.0025 which is the same 750 mm^2/m

Maximum diameter of rebar for shear wall as per IS 13920-2016 Clause 10.1.8

1/10th of the wall thickness -=300/10

                                                  =30 mm

Commercial rebar diameter 25mm shall be adopted 

Confining reinforcement spacing for boundary element as per IS 13920-2016 Clause 10.4.4

• 1/3 of minimum member dimension =300/3 =100mm
• 6 times smallest main rebar =6x25=150mm
• 150mm permissible if vertical bars are spaced at maximum 200mm

Maximum spacing og confining reinforcement in boundary element 150mm

confining within boundary element as per IS 13920-2016 Clause 10.4.4

Sv=150 mm h=1000mm 

Ast =452mm^2

open the model in etabs file given in the challange 

Plan >terrace> all Stories/

Go and check the model labels

Select the shear wall at grid 11A

Then Show only selected objects > elevation> select along grid 11

Story data extract from model

• Go to Run Analysis and Extract the disign information of the shear wall 

                                                                      

Pier longitudinal RC                        Pier shear reinforcement                          Pier Boundary edge reinforcment

REINFORCEMENT DETAILS OF SHEAR WALL

SHEAR WALL REINFORCEMENT DETAILS OF FULL HEIGHT From Bottom to the Terrace

Shear wall Bottom details 

• Shear stirrups hooks are taken as 65mm as per code IS-13920-2016
• Development length provided as 41 times the diameter of the bar