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

CHALLENGE - 9

ANSWERS

1. AIM & INTRODUCTION:

• To Know the design of RC Shear wall using ETAB analysis.
• To know the basics of shear wall reinforcement details with respect to primary standards.
• To ensure the ductility reinforcement required as per IS 13920-2016 has been satisfied in reinforcement drawing.

VERTICAL REINFORCEMENT OF SHEAR WALL AT GRID A-11 (mm2) FROM ETABS (300X1500)

BOUNDARY ELEMENT WIDTH OF SHEAR WALL AT GRID 11-A (1000mm)

HORIZONTAL REINFORCEMENT OF SHEAR WALL AT GRID 11-A (mm2/mm)

DETAILING GUIDANCE FOR SHEAR WALL :

Classification of shear wall as per IS 13920:2016:

As per clause 10.1.4

i.e 21000/1500 = 14 > 2

Hence Slender wall.

Minimum net vertical reinforcement as per IS: 13920:2016, Table 1. (iii)

= 0.0025+0.01375 (300/1500)

= 0.00525 x(1500*300)

= 2363 mm²

Minimum vertical reinforcement with boundary element, Table 1. (iii)

= 0.008 x 600x300

= 1440 mm² on left (600mm width boundary element )

= 1080 mm² on right (450mm width boundary element )

DETAILING GUIDANCE FOR SHEAR WALL :

Minimum horizontal reinforcement of shear wall as per IS 13920:2016:

P_h = 750/(300x1000) = 0.0025

(P_h)_min = 0.0025+0.5(21000/1500-2)x(0.0025-0.0025)

= 0.0025, Same as 750 mm ²

Maximum diameter of rebar for shear wall:

= 300/10

= 30 mm

Adopt 25mm dia rebar in vertical reinforcement.

Detailing for confining reinforcement:

1. 1/3 of 300 = 100mm
2. 6 x 25 = 150mm
3. 150mm

4. Maximum spacing of confining reinforcement in boundary element = 150mm

   Confining reinforcement within boundary element as per IS 13920-2016.

   = 0.05x150x1000x25/415

   = 452 mm²

   DETAILING OF SHEAR WALL AND BOUNDARY ELEMENT