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

Ans:

AIM: To design and analysis of G+3 hostel building in etabs and foundation in safe 

 

Introduction: 

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 instituteThe 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 expansion gap
Foundation details illustrating the pile & pile cap reinforcement
Tie beam details connecting the pile caps
Column reinforcement
Framing plan for typical floor
Beam reinforcements for ground floor

 

Procedure: 

 first create etabs model

 

step 1: open the etabs software 

click on built up option from instialisation window 

then put all correcect code 

like that 

step 2) grid setting 

set grid of X direction and Y direction accordingly plan as shoiwn below 

now add storie data 

like that 

 

now our frame plan is ready on etabs screen 

 

 

step 3) now define material property 

go to define tab and select material option 

 

click on add new material option 

and add M25 grade concrete 

and also rebar of fe415 and fe500 fck 

 

 

our all material are shown below 

 

step 4) section property

go to define 

and click on frame section 

then click on add new property 

 

select rectangular section 

and press ok 

 

 

 

now for column 

 

again add column of size 650X450

 

 

step 5) slab properties

go to define 

then select slab section from section proprties 

 

now also take 200 slab thickness seprate for staircase 

 

our slab properties are as below 

 

 

step 6) draw column using quick draw option 

 

step 6) 

draw beam B 450X650 to for all stories

by changing working plane as all stories 

using quick draw beams 

 

step 7) add slab using quick draw floor/wall option 

 

step 8) now go to base plan from plan option 

and select all joints

and assign restraint joint option from assign 

 

 

step 10) now go for load pattern from define option \

 

then select EQX and click on modify lateral load, new tab will appear 

in that select X direction as per IS 800-2002, seismic zone factor for guwahati, aasam is taken as 0.36 as mentioned below 

select site type as 3

click Ok 

similarly do for all seismic load 

 

Step 11) now select floor for all stories to apply LL load on floor

go to select click on object in that slect floor 

click on select button and click close 

 

 

then click to assign option assign option select shell load, from shell load select uniform option 

 

and click ok

 

step 12) assign load on beam 

select object type option then select beam and click on select button 

and then close it 

now click on assign option and then select frame load 

click on sistributed load option 

 

step 13) mass source 

from define option select mass source 

as shown below 

in that click on modify mass source 

 

in that add load pattern in mass source data 

like that 

 

step 14) load combination

select load combination from define option 

 

in that click on add default design combos 

in that click on concrete frame design 

 

 

step 15) select floor for diaphram 

select option then object type then floor 

 

then select diphram from shell option from assign 

then click on D1 press apply and then close 

diphram is assign to slab 

 

step 16) Run analysis 

 

Step 17) now beam design and column design by selecting start design option 

after that we select display design information from design option

 

 

also check for shear reinforcement 

 

 

and for column we need 2340 sq.mm reinforcement required 

 

 

step 18) export base floor load and load from above in safe 

 

 

 

SAFE model (foundation Design) 

 

step 1) after exporting etabs model to safe then open the safe and import file 

 

step 2) now show load from display option 

 dead above load 

 

Step 3) given in question 

soil type = 3

piles of length = 10m

pile dia = 500mm 

load carrying capacity = 280KN

pile cap = slab type = mat = 500mm thick 

column cap slab = stiff 500mm thick 

so firstly define the slab property 

 

Step 4) define slab property 

 

step 5) RC beam section of tie connection of foundation is 600X500mm is assigned 

 

 

step 6) for piles the point springs are assigned 

 

step 7) for bearing pressure checking the service load combination is considered 

for flexural design the ultimate load combination is considered 

 

 

Step 8) Define the soil
.

 

 

step 9)  Draw the points for the reference of the pile

 

Step 10) draw piles And assign the point springs
.
.

 

step 12) Draw columns below the loads
.

 

step 13) Run model Display the deflection
.

 

Step 14)  Reactions
.

 

Step 15) Punching shear

 

 

Step 16) Design reinforcement
 Since load was heavy the model divided to 3 pasts and analysis was done
.
.
.
.

 

Result: 

G+3 Hostel building design and analyse is done in etabs &

the foundation design and analysis in safe also done