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

 Aim: 

 To determine the project

Introduction:

 This project is about G+6 building is provided. Run the analysis and design the RCC shear walls. The following challenge deals specifically with the shear wall of size 300x1500 at grid A-11 in the structural model.

Procedure:

• Values of longitudinal steel ratio, boundary element length and shear reinforcing ratio from the design results.
• Cross sectional steel arrangement of the shear wall from its base up to terrace, in compliance with provisions of IS 13920 – 2016. 

Detail rule of any reinforced concrete member
1. Minimum reinforcement shrinkage and temperature          Whichever is greater
2. Ultimate limits state design rebar recruitment                   should be drawn in
3. Ductility rebar recruitment                                              Rc shear wall detailing

• Classification of shear wall as per IS-13920-2016 Table-1 (iii) clause 10.1.4 slender wall hw/Lw = (21000/1500)
• Minimum net reinforcement as per IS-13920-2016-1 (iii) 2363 mm2 = 0.00025 = 0.01375 (300/1500)
• Minimum vertical reinforcement within boundary element Table-1 (iii)

           1440 mm2 on left (600mm width boundary element)

           1080 mm2 on right (450 width boundary element)

Detailing guidelines for shear wall:

• Minimum horizotial reinforcement in shear wall as per  IS-13920-2016 Table (iii)                                                    (Ph)min=0.0025=0.5(hw/Lw−2)(Ph−0.0025)

            (Ph)750/ (300x1000)=0.0025=, hw=21000, Lw= 15000  (Ph)min = 0.0025 + 0.5 (21/15-2)x0

           (Ph)min = 0.0025 +which is the same 750 mm2/m

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

                     1/10 of wall thickess - 300/10 = 300mm

 Commerical rebar dia 25mm shall be adopted

Deatiling guidelines for shear wall:

• confining reinforcement spacing for boundary element as per IS-13920-2016 clause 10.4.4

  i) 1/3 of minimum members dimension = 300/3 = 100

  ii) 6 times smallest main rebar = 6x25 = 150 mm

  iii) 150 mm permissible if vertical bars are spaced at maximum 200 mm

   Maximum spacing of confining reinforcement in boundary elements 150 mm

• Confining reinforcement within boundary element as per IS-13920-2016 clause 10.4.4

                       Ash=0.05 sv h fck/fy

                       sv = 150 mm, h = 1000 mm

                       Ash = 45w mm2

Vertical, horizontial reinforcement & boundary element widths of shear wall at grid - 11A from ETABS (300x1500)

 Storey assignment tab to refer elevation of shear wall