Week 3 Challenge

1.1)

ANS : The primary load cases to be considerd for the design are the

• Dead load
• Live load / Imposed load
• Wind load
• Earth quakeload

1.2)

ANS : One - way slab

• The ratio of the longer span to the shorter span is greater than 2 is know as one - way slab
• Where LY / LX is great than 2

1.3)

ANS: The unit weight of structural steel and soil is given in IS 875 part 1

• The unit weight of structural steel is 78.5 KN/m^3
• The Unit weight of soil is 18 kN/m3

1.4)

ANS:

• Circular section
• Rectangular section
• Trepezodial section
• Tee section
• Genaral section
• Tapered I
• Tapered tube

1.5)

ANS:

• Primary Beams are the beam located at the exterior of the Structural elements
• Secondary beam are laid on the primary beam

2.1)

ANS: The factors that influence the design presure intensity of a high rise building are

• k1 = probability factor ( risk coefficient.)

• k2 = terrain, height and structure size

• k3 = topography factor

  Design Wind Pressure - The design wind pressure at any height above mean ground level shall be obtained by the following relationship
  between wind pressure and wind velocity

Pz = 0.6 Vz^2

2.2)

ANS: The load transfer process of a reinforced concrete building is

1. Slab
2. Secondary beam
3. Primary beam
4. Columns
5. Foundation

3.1)

ANS :

One - way slab

• The ratio of the longer span to the shorter span is greater than 2 is know as one - way slab
• Where LY / LX is greater than 2

Two - way slab

• The ratio of the longer span to the shorter span is less than or equal to 2 is know as two way slab
• Where LY / LX is Less than 2

3.2)

ANS :

• Secondary beam are the internal beam that are restrained on the primary beam
• They are the simply supported beam
• In secondary beam the moment is Zero at the end of the beam

3.3)
a. State the Indian Standards for each load case

ANS :

• For Dead load : IS code 875 Part 1
• Live load : IS code 875 part 2
• Wind load : IS code 85 part 3
• Seismic load : IS 13927
  
  b. Detail the parameters of each load case

ANS :

• The parameter of Dead load are 1) unit weight 2) Volume of the section that may be rectangular section , circular section etc
• The parameter of Live load are depend on the building type reidential building , commercial building, industrial building , Area type room , toilet room , corriodar , roof etc

c. Brief each load case

ANS :

• A load case is a combination of different types of loads with safety factors applied to them.
• A structure is checked for strength and serviceability against all the load cases it is likely to experience during its lifetime.

3.4)

ANS :

• Go to property section
• Click on Define material
• Select the section , Rectangular section , circular section etc
• Select the material type concrete , steel , aluminum
• Select the material type and assign to the selected view

For the support

• Click on the support
• Click on the create
• Select the type of support do we want to assign the section

3.5)

ANS:

• First create a simple model by using the node in staad pro.
• Click on the create beam option and create a beam in the direction of x and Z axis
• Click on any primary beam in the section
• Right click and add new node in the beam section a node will be added
• Again click on the create beam

PRACTICAL:

1)

ANS:

Wind presure Pz = 0.6 Vz^2

where Vz = Vb X k1 X k2 X K3

Vb = Wind speed at the certain location = 50

K1 = Risk coffiecient =1.0

K2 = Terrain height and structure factor = 1.12

K3 = Topography factor = 0.5

Vz = Vb X k1 X k2 X K3

= 50 X 1.0 X 1.12 X 0.5

= 28

Pz= 0.6X (28)^2=470.4

2)

ANS:

The Dead load of the section considering the section length 10 m and width 0.3m and depth is 0.6m

Dead load of the section = Unit weight x volume of the section

= unit weight of concrete is 25 KN/m

= Volume of the section = 0.6 x 0.3 X1

= 0.18 m^3

Dead load = 25 X 0.18

= 4.5 KN/m

Live load = based on usage and occupancy