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

Aim : Analysis & Design of RCC shear walls in the model using ETABSthen start the ETABS Software

Procedure :

• Open the Etab Software
• then go to the file menu
• Go to file and noe click Import and then OK
• 
• Now Run Analysis
• Now after Running Analysis is completed Click concrete frame Design and check for shear Wall
• 
• Below given is the Shear wall detailing calculations:
• Here, the total height of the wall is 21000mm and the width of the wall is 1500mm.
• Hence, the ratio is obtained as 21000 /1500 = 14which is greater than 2
• hence, it can be considered as a slender wall.
• Maximum diameter of the bar that can be used from IS code = 1/10th of thickness of that part = 30mm
• Hence, we take the dia of bar as 25mm.
• Maximum spacing between the bars should not exceed the minimum of the following:
  • 1/5 x 1500 300mm
  • 3x300 900mm
  • 450 mm

So the maximum spacing Limit is 300mm

• Longitudinal reinforcement:
• Go to Design Info
• Select Longitudinal Reinforcement
• Click ok
• 
• We have the maximum longitudinal reinforcement obtained 13128mm².
• Since we are using 25mm dia bars, the no. of bars required will be 13128 /490 =28 bars. But we are providing two additional bars in the boundary element for proper confinement.
• i.e total 30 longitudinal bars.
• Hence the total area of reinforcement provided is 13720mm². Hence, it is safe.
• Now, from the code the minimum vertical reinforcement required is 0.0025+0.01375 (tw/Lw)
• = 0.00525, l.e0.00525x300x1500 = 2362.5mm2 which is less than actually provided hence safe.
• Now, minimum vertical reinforcement to be provided in the boundary region = 0.008 x 1500 x 300 = 3600mm².
• The reinforcement provided for boundary element in right side = 4410 mm²and
• At left side = 5390mm Both are greater than the required value i.e 3600mm². Hence safe.
• In the web area the minimum reinforcement provided is 0.0025x1500x300-1125mm² and the provided amount of reinforcement in web area is 3920mm²

• Horizontal reinforcement:
• Go to design check and select peir Shear Reinforcement
• Click on apply and then ok.
• 
• So let us provide 8mm dia bars @ 100 mm c/c, then the provided area of reinforcement will be 1000mm².

• Now check the boundary element
• Go to design check
• 
• From clause 10.4.4, the shear reinforcement required in the boundary element can be obtained from the equation

  Shear wall detailing calculation .

  1) Base Floor to 1st Floor -

  

  Therefore , Minimum vertical reinforcement

  

  a)

  1. Longitudinal Reinforcement Calculations -

  

  2. Shear Calculation -

  

  

  2) First Floor to Second Floor -

  1. Longitudinal Reinforcement Calculations -

  

  2. Shear Calculation -

  

  Note - Boundary element length is reduced as we move up . It means that Stresses are reduces .

  3) Second Floor to Third Floor -

  1. Longitudinal Reinforcement Calculations -

  

  2. Shear Calculation -

  

  

Conclusion : Hence Challenge 10 is Completed