Week 3 Challenge

1Q

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

• DEAD LOAD
• LIVE LOAD
• WIND LOAD
• EARTHQUAKE LOAD
• TEMPERATURE LOAD
• IMPACT LOAD etc

1.2 What is One – Way slab?

LONGER SPAN LX

SHORTER SPAN LY

if LX/LY IS GREATER THAN 2 IT IS ONE WAY SLAB.

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

unit weight of structural steel

unit weight of soil

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

REINFORCED CONCRETE BEAM AND COLUMN AND STEEL BEAM AND COLUMN OF DIFFERENT SECTION

I SECTION CHANNEL SECTION ANGLES BUILT UP SECTION

1.5 Define Primary Beams.

MEMBERS JOINING COLUMNS ARE PRIMARY BEAMS OR MAIN BEAMS

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

2Q

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

1. Strength and rigidity.
2. Velocity & Density of air.
3. Stability and durability of materials.
4. Height above the ground level.
5. Shape and Aspect ratio of the building.
6. Topography of the surrounding ground surface.
7. Angle of wind striking the building.
8. Solidity ratio or opening in the structure.
9. Suscestiblity of the structural system by the dynamic effected by the wind.

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

01 LOAD on SLAB of structure - beams - colomns - footings

02 load flow path of RCC building

3Q

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

One-Way Slab	Two-way Slab
1.	The one-way slab can be defined as the type of slab in which the ratio of the longer span to the shorter span is greater than two.	The two-way slab can be defined as the type of slab in which the ratio of the longer span to the shorter span is less than two.
2.	The bending moment occurs only in one direction.	The bending moment occurs in two directions.
3.	L/B ratio is greater than 2.	L/B ratio is less than 2.
4.	In a one-way slab, the crank is provided in two directions.	In a two-way slab, the crank is provided in four directions.
5.	In a one-way slab, the main reinforcement is provided in a short span and distribution reinforcement is provided in a long span.	In a two-way slab, the main reinforcement is provided in both directions.
6.	The one-way slab is supported by a beam on two opposite sides only.	The two-way slab is supported by the beam on all four sides.
7.	In a one-way slab, the load is carried in one direction perpendicular to the supporting beam.	In a two-way slab, the load is carried in both directions.
8.	The one-way slab is economical up to a span of 3.6 meters.	The two-way slab is economical for panel sizes up to 6m x 6m.
9.	In a one-way slab quantity of steel required is less.	In a two-way slab quantity of steel is more as compared to the one-way slab.
10.	It is mostly used for culverts, bridges, etc.	It is mostly used for residential buildings, water tanks, etc.

3.2 Explain the concept of secondary beams with proper sketch.

3.3 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 loads IS 875 Part-1
2. Imposed loads IS 875 Part-2
3. Wind loads IS 875 Part-3
4. Snow loads
5. Earthquake loads IS 893 Part-1
6. Special loads IS 893

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

GOTO PROPERTIES > define properties > select section database(TYPE F SHAPE)

> Assign properties to selected beams or columns.

GOTO supports > CREATE > select SUPPORT > Add > Assign support.

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

SECONDARY BEAMS are modelled first and property is assigned to BEAMS

Practical
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 )