Challenge

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

AAyyappa Adapureddy2 Jul 2023

AIM :

To model , design and analyse a G+3 RCC building which is a Female Hostel block and

The following information on the building is to be used:

Location – Guwahati, Assam
Function – Hostel block in an academic institute

INTRODUCTION :

ETABS is an engineering software that is used to model multi-story building , analysis and design. Modeling tools and templates, code-based load prescriptions, analysis methods and solution techniques, all coordinate with the grid-like geometry unique to this class of structure.

SAFE is the ultimate tool for rapidly designing concrete floor and foundation systems. From framing layout to design and detailed drawing production, SAFE integrates every aspect of the engineering design process in one easy and intuitive environment.

PROCEDURE :

Step 1)

Open the Etabs software from deskstop icon
Once software is open - Click on New model

Step 2)

Once you click on New model
A Model Initialization setting will open
Select - Metric SI units
Select section database - Indian
Select Steel code - IS 800-2007
Select Concrete design code - IS 456-2000

Step 3)

Once you click Okay
A following dialog box of grid settings will open
In New Model Quick templates under grid dimensions select the custom grid spacing

Once you click on Custom grid spacing
Click on Display grid data as spacing

Now input the storey details
As given in question and Story 1 was selected as the Master story
Click on Okay.

Step 5)

Once you click on Okay
A plan and 3D view of model is created in model space

Step 6)

Now we have to define the materia properties
Click on Define
Click on Material properties

Add New material as Concrete
Select Grade of conccrete -
Standard as Indian
Click on Okay.

Click on okay
The remaining data is as per IS Code

Similarly we have to define the materia properties for Steel
Click on Define
Click on Material properties
Select New material as Rebar
Select Grade of Steel - HYSD -
Standard as Indian
Click on Ok

Click on Okay
The remaining data is as per IS code

Material properties is added

Step 8)

Now we have to Define the section properties (Column and Beam)
Click on Define
Select - Section properties
Click on Frame Section

Click on Okay.
Click on Add new property
Select Rectangular shape
Give property name Beam - 400x500(given)
Material type - M25
Section Shape - Concrete Rectangular
Width - 400 mm
Depth - 500 mm

Click on Modify / show Rebar
Select M3 Design Only (Beam)
Select the rebar materials as HYSD Fe415 in both the direction
Click on okay.

Similarly we have to follow the same steps for Column also.
Property name - Column 450 x 650 mm
Material - M25
Width - 450 mm
Depth - 650 mm

Click on Modify / show Rebar
Select M3 Design Only (Column)
Select the Rebar materials as HYSD Fe415 in both the direction
Click on okay.

Step 9)

Now we have to define Slab
Click on Define
Select Section Properties - Select Slab properties
Click on Slab Section
Give property nam e- Slab 150
Slab material - M30
Modeling Type - Membrane
Type - Slab
Thickness - 150 mm

Step 10)

Now we have keep the 3D view also to see the properties
Now we have to add the columns and beams
Click on Quick Draw Column option
Select the Column properties which we have defined earlier
Draw the columns at the grids as shown in below
Note that - All stories option should be selected which is at the Bottom

Similarly we have to draw beams also
Select Quick Draw Beam option
Select the Beam properties which we have defined earlier
Draw the beam as shown below

Step 11)

Now we have to add the slabs
Select Quick draw floor
Draw the slabs as shown below

Step 12)

Now we have to assign the loads
Select Define
Click on load patterns
Define load pattern dialogue box will open
Add the Following loads and Select the IS code for Seismic Case as IS -1893

The direction and eccentricity were selected as the X direction
The Response Reduction Factor R was taken as 5
Seismic zone is 5 so Z=0.36
Soil type was taken as III
Importance factor for residential building with less than 200 is taken 1 and time period is taken as 0.2

Step 13)

Now we have to assign the loads to the strucure -
AAC block load - 3.5 kn/m2

Live loads were applied to slabs next.
As per IS 875 in residential buildings its 2kn/m^2 for rooms

Floor Finish

In the same way select slabs to assign floor finish which is 1 Kn/m^2

Step 14)

Now we have to assign Mass source
For that Define menu- mass sourceoptions to open the mass source dialogue box.

Now select Modify mass source data option and click OK
Now mass source datawas provided as shown and load patternwas also added to it.
For live load upto 3kn/m2-we have to assumed some fraction of live load i.e 25%

Step 15)

Now we haey to assign diaphragm
In assign menuselect Shellfollowed by Diaphragm to open the shell Assignment diaphragm dialogue box
Select D1 from the diaphragm assignments and click apply followed by OK.

The Diaphragm D1 is applied and is as shown below.

Step 16)

Now we have to add the load combinations
Click on Add default Design Combo

Step 17)

Now we have to check the model for errors,go to Analysis tab and select check model.

Step 18)

Now Run the model
Click on Run Analysis

Storey response plot:

For this go to Display-Story Response Plot-Maximum Storey drift
Here storey response for maximum storey drift is less than 0.004 for both X and Y

Beam Design Check
Click on beam design check

Check for Beam Shear reinforcement
Column Longitudinal Reinforcement

Column Shear Reinforcement
Beam Reinforcement details

Beam Reinforcement

Pile Cap Reinforcement

SAFE DESIGN :

Step 1)

In order to export the ETABS model into SAFE click on file - Export - Story as SAFE V12.f2k file option
Once you click on this option folowing diaog box will open