Week 3 Challenge

1. State the primary load cases to be considered for design.

• Dead load
• Live load
• Wind load
• Seismic load
• Accidental load
• Snow load

2. What is One – Way slab?

L/B is <2 is a one way slab

L = Lenghth of the sLAB

B = Breath of the slab

3. What is the value of unit weight of structural steel and soil?

The unit weight of the structural steel is 7850 kg/m^3

The unit weight of the soil ie varies from 16 - 22 KN/m^3

4. Name few sections that can be defined using Properties tab in STAAD Pro.

• Rectangular section
• Circular section
• Hallow section
• Angle section
• Tapered section
• Built up section

5. Define Primary Beams.

The main is connect to column to column and also carries a major load of the structure comparetively lagrer than secondary beam. it also used for larger span

1. State the factors and parameters that influence the design pressure intensity of a high-rise building.

• Building Height
• location
• Wind speed
• Geography
• Seismic Condition
• Building exposure condition

2. Mention the load transfer process of a Reinforced Concrete Building.

Live load to slab

Slab to Beam

Beam to column

column to footing

footing to soil

1. Differentiate One-Way and Two way slabs. Elaborate each slab type.

One-Way:

• In this slab the load transfer in majorly in one direction. this slab resist Bending moment in one direction
• L/B <2

Two way:

• In this slab the load tranfer is in two direction, It resists the bending moment in two direction
• L/B > 2

2. Explain the concept of secondary beams with proper sketch.

In the structure model the primary bea are designed to tranfer the heavy load to the column the function of secindary beam is to distribute the loads to the primary beam evenlly.

3. Mention the Primary load cases.
a. State the Indian Standards for each load case
b. Detail the parameters of each load case
c. Brief each load case

1) Dead Load

a) IS 875 (part 1)

b) Materials weight: Self weight of the Structural element ,Floor finishes and fixed parameter of the loads

partition load,

c) Dead load reprensents the permanent load or static load on the structure, it includes the self weight of the structural element , finishes and other parameters. It never change over all time it remain constant

2) Live load :

a) IS 456( Part 2)

b) Occupancy load, Furnitures , Equipment loads

c) Represents the Transient and movable loads on the structure, such as people,Furniture,equipment,and other dynamic forces

3)Wind Loads:

a) IS 875 (Part 3)

b) Wind speed,Height and exposure

c) Represents the lateral forces exerted by wind on the structure. it consider the effects and pressure suction

4) Earthquake load :

a) a. Indian Standard: IS 1893 (Part 1): 2016 - Criteria for Earthquake Resistant Design of Structures - General Provisions and Buildings.

b. Parameters: - Seismic zone, soil type, building importance factor, and response reduction factor. c. Brief: - Represents the forces exerted by an earthquake. The parameters consider the seismic characteristics of the region

5) Snow loads:

a. Indian Standard: IS 875 (Part 4): 1987 - Code of Practice for Design Loads (Other than Earthquake) for Buildings and Structures - Snow Loads. b. Parameters: - Ground snow load, importance factor, exposure factor, and thermal factor. c. Brief: - Represents the additional load on a structure due to the accumulation of snow on its surfaces.

4. Detail the steps involved in assigning Properties and Support to a model using STAAD Pro sequentially.

ASSIGNING PROPERTIES :

• Open staad pro
• select the structure and click the materials properties on the ribbon tab
• then specify the section properties of the section.like coloumn,beams and slab
• assign the section properties to the selected member

ASSIGNING THE SUPPORT:

• Define the supports
• select the nodes and assign the support
• release the member properties

5. Brief the steps to be followed to create and assign secondary beams in STAAD Pro

• Open staad pro software
• Open a new file
• Add nodes for the primary and secondary beams
• define the parameters and sections
• add materials to the structure
• add loads to the structure and create the support
• assign the support and analysis the structure

1. Calculate the wind pressure for the given building
a. Building Dimension : 20m x 30m x 20m height RCC
b. Building usage : Hospital block in city centre
c. Location : Darjeeling
2. Calculate the Dead load and Live load for the above building with reference to IS standards ( assume suitable sections )

• STEP 1) Calculate Design Wind Speed: (IS:875-1987 Part-3)

  • Basic Wind Speed Vb = 47m/s (Darjeeling)
  • Risk Coefficient k1 = 1.07 (Hospital Building)
  • Terrain roughness k2 = 0.80 Category 4 (City Center very closed building)
  • Topography Factor k3 = 1 (consider less than 3-degree undulated surface)
  • Design Wind Speed Vz

  Vz = Vb k1 k2 k3

  Vz = 47 x 1.07 x 0.80 x 1

  Vz = 40.23 m/s

  • Design Wind Pressure Pz

  Pz = 0.6Vz2

  Pz = 0.6x40.23x40.23

  Pz = 0.97 kN

• 2. Calculate the Dead load and Live load for the above building with reference to IS standards (assume suitable sections).

  Assume the Dimensions of Structural Member-

  Column size : 0.6m x 0.6m

  Beam size : 0.45m x 0.6m

  Slab thickness : 0.150m

  Floor height : 3.3m

  Dead Load/ Superimposed Dead Load on typical Floor

  Interior Partition :1 KN/m²

  Floor Finish :2.20 KN/m²

  MEP Service :0.50 KN/m²

  Insulation And Water Proofing :0.2 KN/m²

  Parapet Wall :0.20 KN/m²

  Miscellaneous :1 KN/m²

  Total Dead Load On Typical Floor 5 KN/m²

  Calculation of the Live Load-

  As per IS: 875 (Part 2) - 1987 the live load of the Hospital buildings

  Ward rooms :2.0 KN/m²

  Office and OPD Room :2.5 KN/m²

  Laboratory :3.0 KN/m²

  Lift machine room :7.5 KN/m²

  Toilets and Bathrooms :2.0 KN/m²

  Staircase :4.0 KN/m²

  Corridor and Passages :4.0 KN/m²