Project 2_Design & Analysis of a Hostel building at Guwahati, Assam

AIM: Run a modal response spectrum analysis of a G+3 RCC building in zone 5.

INTRODUCTION: In this project, participants will get to experience the entire design process from modeling, analysis, design, and preparation of construction drawings. The architectural drawings of a G+3 RCC building are provided.

• Brickwall made of AAC blocks.
• Finishes – floor tiles of 75 mm thickness
• Live loads as per are 875 part 2

• Location – Guwahati, Assam
• Function – Hostel block in an academic institute
• soil type - III
• Pile length - 10 meters
• Dia. of the pile - 500 mm
• Pile capacity - 280 KN
• Ground Floor Level - +2000 mm
• Grade of concrete - M25

PROCEDURE:

• first, create a centerline drawing of the beam and column from the typical floor plan.

• fetch the data into ETABSand create Grids line.

• Now define the material property and after that specify the section property.

• now assign the column, beam (primary + secondary), and slab in the plan according to the architectural project.

( This is the initial structural plan of the given architectural plan. It may be changed after the analysis result.)

• Now define load cases: Live load, brick wall load, finishes, and earthquake load.

<> For earthquake load

The time period of the building is calculated by system.

<> Reduction factor for RC framing= 5

<> for zone V, zone factor=0.36

<> Importance factor = 1.2 ( for residential building occupancy of more than 200 people)

• Define mass source and diphagram for earthquake load analysis.

<> Mass source is actually the seismic weight of a building. Here we take only 25% of the live load(here live load is less than 3KN/m2)

• now assign live load, dead load, and live load reduction factor according to IS 875 PART1&2

<<>>For residential buildings:IS875 part2

<> All Bedroom and kitchen = 2.0 KN/m2

<> Toilet and bathroom = 2.0 KN/m2

<> Corridor, passage, storage, lift core, staircase = 3.0 KN/m2

<<>>For residential buildings:IS875 part1

<> Brickwall load ( ACC Block+ plastering) = 3.5 KN/m

<> floor finishes = 1.25-1.5 KN/m2

• Now define load combination.
• check the model and run the model.

• Now check the stability and deflection of the building.

<<>> Vertical stability and stiffness.

> time period is very less. so It is very stiff but it is not that stable vertically.

<<>> storey drifts

Eqy Eqx

> maximum story drifts ls less than 0.4% of total height.It is stable.

• after checking the stability of the building then go to member check design.

>> All members passed.

>> now click on the steel details of the beam and column.

( Longitudinal reinforcement of beams) (shear reinforcement of beams)

( Longitudinal reinforcement of columns) (shear reinforcement of columns)

• Now export the file in Safe .f2k file.
• and open the safe software and import this file to the design pile foundation for this building.

>> All the column beam joints are available here.

• Now define material property, section property, and spring constant value for piles
• No need to define load, it is already present.
• Now draw piles caps, piles and columns at the position of a column as per need.

• Now run and design analysis of pile caps.

• Since the structure is very large, and every pile cap has a different settlement, we have to provide tie beams so that they have the same settlement.

• Now click on slab design.
• we get reinforcement values at top and bottom of pile caps.

Result:

• Beam column reinforcement details:

BEAM SIZE- (450X750)

• Pile foundation reinforcement details:

• Tie beams details:

size (500x800)

• Framing plan for typical floor

THANK YOU.