Challenge

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

SSrikanth Pamidakula7 Nov 2022

In this project, participants will get to experience the entire design process from modelling, analysis, design, and preparation of construction drawings. The architectural drawings of a G+3 RCC building is provided. The following information on the building is to be used:

• Location Guwahati, Assam

• Function- Hostel block in an academic institute

The walls will be made of AAC blocks. Other loadings are to be calculated as per the architectural drawings.

The buildings rests on type 3 soil. Piles of length 10 meters and 500 mm diameter with a load-carrying capacity of 280 KN is to be used.

The ground floor level will be at a height of 2 meters above the existing site level to avoid floodwater enter the building.

M25 grade of concrete with Fe500 for longitudinal

reinforcement and Fe 415 for shear reinforcement is

to be used.

The following design IS codes will be required for reference:

IS 875 part 1
IS 875 part 2
IS 13920
IS 1893
IS 2911 part 2
IS 456
SP 34

Students will have to produce the following:

• Etabs model for the two blocks on either side of the expansiogap

reinforcement

• Foundation details illustrating the pile & pile cap Tie beam details connecting the pile caps

• Column reinforcement

• Framing plan for typical floor • Beam reinforcements for ground floor

ANS:

AIM: To design and analyze od G + 3 hostel building Guwahati Assam by Etabs and safe software

PROCEDURE:

Step 1: DATA REQUIRED FOR ETABS ANALYSIS

Consider the supports as pinned support and story

height as Base + 5 story + Mumty

Column size as 450 x 650 mm, Beam size as 400 x 500 mm, Slab thickness as 150 mm and there is no requirement as shear wall

Now we have to consider loads acting on the building

Floor live load = 2 KN/mmsq

Terrace live load = 1 KN/mmsq

Floor finish + Ceiling finish = 1 KN/mmsq

Partition wall load = 3.5 KN/m

Balcony wall load = 1 KN/m

Guwahati seismic zone is zone V

Step 2: Open then Etabs software and click on new model, the model initialization dialogue box will appear in that select use Built-in settings with and make the settings accordingly and press ok New model quick template dialogue box will appear

In the dialogue box select custom grid spacing in grid dimension and select custom story data in story dimension

In custom grid spacing click on edit grid data you will

get the grid system data dialogue box Give the data according to the question given in both x

and y direction As per the question the spacing between the grids both x and y direction and give other data accordingly and

press ok

In custom story data click on edit story data you will get the story data dialogue box Add the story as per the given question given

Give the master story as first story and for other story give similar to as first story

By right clicking the arrow given in top row add the required amount of story and do the settings accordingly and press ok

Step 3: Go to define tab and select material properties Add grade of concrete as M25 and Grade of steel reinforcement bars as Fe415, Grade of steel reinforcement bars as Fe500 and do the settings accordingly for each material

Step 4: Go to define tab and select section properties in that select frame sections Add column of size 450 x 650 mm and beam of size 400 x 500 mm properties as per the question by clicking on

Add new property

Go to define tab and select section properties in that select slab sections

Add slab of 150mm thick as per the question by clicking on Add new property

Step 5: Draw the column 450 x 650 at each intersection of the grid by selecting Quick draw column

Go to Assign tab in that select frame and select local axes and rotate the columns wherever needed by 90 degree

Draw the beam 400 x 500 at grid line by selecting Quick draw beam

Draw slab of 150mm by selecting quick draw floor

Step 6: Go to base and select all the joints Go to assign tab select joint in that select restaints and select pinned support for all the directions and click on apply

Step 7: Go to define and select the load pattern Add the loads like dead load, live load, brickwall load and earthquake load both in x and y direction in positive and negative direction

Click on modify lateral load of all earthquake loads, set a range from base to mumty floor, seismic zone factor as 0.36, importance factor as 1, site type as III and time period as program calculated

Step 8: Assign live load and floor finish to all the story Give the live load as 2KN/msq for all the stories By selecting the slabs go to assign tab and select shell load and do the settings accordingly and click apply

Step 9: Assign wall load to all the story Give the brick wall load as 3.5KN/m for all the stories

By selecting the beams go to assign tab and select frame load and do the settings accordingly and click apply

Step 10: Go to define tab and select mass source and modify the mass source Add the required load and assign the load to the model

Go to define tab in that select load combination

add new modal case 1

Step 11: To create the diaphragm to the shell go to select in that select object type and in that select floors and click select and press close

Step 12: Go to define tab select functions in that select response spectrum

After selecting response spectrum a new dialogue box will appear in that choose IS 1893 - 2016 in choose function type and click on modify/show spectrum

A new dialogue will appear in that give function name as

IS Function and remaining details same as per the code so no need to change

Step 13: Go to define tab in that select load cases In the dialogue box appeared select add new load cases and add the required load cases Add detail of load case in the load case data

Step 14: Go to define tab and select load combinations in the dialogue box click on add default design combinations in the dialogue box select Concrete frame design and click ok

Step 15: Go to Analyze and select check model and analyze the model for errors

Step 16: Go to analyze tab in that select run analysis the model will get analyzed and results will occur

Step 17: Go to display tab select show tables and select base reactions and click ok Base reaction table as been appeared

Now we have to check EQ should be closer to RS, So we have to

calculate in both x and y direction

(EQ/RS) x scale factor of response spectrum

(2241.3352/1883.2626)x9806.65 = 11671.2294 KN in x direction

(2073.0974/4.7129)x9806.65 = 4313722.043 KN in y direction Put the above values as scale factor for response spectrum at both x and y direction in the load case data

Again run the analysis and then again select base reaction table the EQ is closer to RS

Step 18: Go to display tab select show tables and select modal participating mass ratio and press ok

Modal participating mass ratio table as been appeared

Step 19: Go to display select and select story response spectrum and select story response as maximum story drifts in both x and y direction and it should be not more than 4%

Step 20: Go to concrete frame design and run After the run drop down the arrow next to concrete frame design and select display design info I that select longitudinal reinforcing and shear reinforcing

Step 21: Now go to plan view and select base select reactions tab and select earthquake load toward x direction in the load case and click ok. Now base shear reaction will appear

Step 22: Go to load combination and add service load go to reactions select load combo as service and apply you will get the lad acting on the column in z direction

Step 23: Go to file tab select export in that select safe software file version and save the file accordingly

Define Draw Select Assign Jenayin Dughey Design

Step 24: Open the safe software and import the file exported from etabs

Given data

Column size - 450 x 600 mm

Soil type - III

Length of the pile 10 m

Pile diameter - 500 mm

Load carrying capacity of the pile - 280 KN

Soil bearing capacity - 150 KN/sqm

Step 25: Go to Define tab in that select material properties in that add new material property and add required material

Material property data:

Click define followed by material properties

M25 grade of concrete

Modulus of elasticity, E = √25 x 5000 = 25000 N/mmsq

Step 26: Go to define tab in that select section properties and select slab sections

Step 27: Go to define tab in that select section properties and select frame sections

Step 28: To draw the slab first we need to go to draw ta in that select draw point object and draw the points

accordingly

Select draw rectangular floor and draw the slab by using points created

Step 29: Draw the points by using draw joint objects and draw the points to place the piles Draw the pile at the points created by using quick draw