Week 3 Challenge

Q.1)

1) Ans - The primary load cases to be considered for the design are -

• Dead Load
• Live Load
• Wind Load
• Earthquake Load

2) Ans -

The one-way slab is a slab,which is supported by parallel walls or beams,and whose length to breadth ratio is equal to or greater than 2 and it bends in only one direction while it is transferring the loads to the two supporting walls or beams,because of its geometry.

3) Ans -

• The unit weight of structural steel is 7840 kg/m^3
• The unit weight of soil is 18 kn/m^3

4) Ans -

• Circular section
• Rectangular section
• Tee section
• Trapezoidal section
• General section
• Tappered section

5) Ans -

Primary Beam - The beams that are connecting to columns for transferring loads of a structure directly to the columns are known as primary beams.Usually, primary beams are shear connected or simply supported and they are provided in a regular building structure.

Q.2)

1) Ans -

The factors that influence the design pressure intensity of a high rise building are -

• K1 = Probability factor
• 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 = 0.6V^2

2) Ans -

The load transfer process of a reinforced concrete building -

• Slab
• Secondary beam
• Primary beam
• Columns
• Foundations

Q.3)

1) Ans -

One way slab -

• The ratio of the longer span to shorter span is greater than 2 is known as onw way slab.
• Ly/Lx > 2
• In one way slab,the bending moment occurs in a singular direction.

Two way slab -

• The ratio of the longer span to the shorter span is less than or equal to 2 is known as two way slab.
• Ly/Lx < 2
• In two way slab,bending moment occurs in both direction.

2) Ans -

Secondary beam -

• The beams that are connecting primary beams for transferring loads of a structure to the primary beams are known as secondary beam.
• These beams are provided for supporting and reducing the deflection of beams and slabs.

3)

a) Ans -

Indian standards of each load case -

• Dead load : IS 875 part 1
• Live load : IS 875 part 2
• Wind load : IS 875 part 3
• Seismic load : IS 13927

b) Ans -

• The parameter of dead load are 1) unit weight 2) volumn of the section that may be rectangular section,circular section etc.
• The parameter of live load are depend on the building type residential building,commercial building,Industrial building,Area type room,Toilet room,Corridor,Roof etc.

c) Ans -

• A load case is a combination of different types of load 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 life time.

4) Ans -

• Go to property section
• Click on define materials
• Select the section ,Rectangular section,Circular section etc
• Select the material type concrete,steel,Aluminium
• For rectangular section enter YD and ZD in the column below
• Click add and close
• Select the material type and assign to the selected views
• For the support, Click on the support
• Click on create
• Select the type of support do we want to assign the section
• Click on add close

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 pressure, Pz = 0.6 Vz^2

Where,Vz = Vb*k1*k2*k3

Vb = Wind speed = 50

k1 = Risk coefficient = 1.0

k2 = Terrain height and structure factor = 1.12

k3 = Topography factor = 0.5

Vz = Vb*k1*k2*k3

= 50*1.0*1.12*0.5

= 28

Pz = 0.6*28^2

= 470.4

Wind pressure, Pz = 0.47 N/m^2

2) Ans -

The dead load of the section considering the section length 5m and width 0.23m

• Dead load of the section= Unit weight *volumn of section
• Unit weight = 25 Kn/m
• Volumn of the section = 0.5*0.23*1 = 0.115 m^3
• Dead load = 25*0.115 = 2.875 Kn/m
• Live laod = Considering the general building ,

Bath rooms and toilets in all types of the building,kitchen

1) Deweling houses 2 - 1.8

2) Hostel,Hotels,Hospitals 3 - 4.5