Challenge

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

IIshant Kanojiya1 Jun 2023

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

Aim:- To Design and Analysis the of G+3 (RCC) hostel building in ETABS and Foundation in CSI SAFE.

Introduction:- In This Project 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 ( Zone V - for semic zone)
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.

Procedure:-

First goto open Etabs and select units
Create grids as per given architectural drawing
Create level as per give in drawing
Grids are created
Add New Materials M25 concrete, Rebar Fe500 and 415,
Add Beam 450X650mm, Coloumn 450X500mm and Slab 150mm thickness
Placed Column and beams At grids or where is required
Select quick draw column / beam
Create slab using Quick draw floor option
Define Load Patterns
Define Load Values
Live load from IS 875 Part-2 = 2kn/m^2
Thickness X height X Density => 0.2m X 3.5m X 550 kg/m^3 = 385 kg/m = 385/100 = 3.85kn/m =3.9 kn/m
Floor finish = 1.5kn/m^2
Define Mass sources/ load cases
Add Load combination using Add default design combo
Define Diaphragram
Check modal after run analyisis
Run Analysisi
Check Maximum story drift not excceding 0.004 (as per code)
EQx is 0.002209 <0.004 (ok)
EQy is 0.002599 <0.004
Result :- BOTH (EQx or EQy) OF THE STORY DRIFT ARE WITHIN THE CODAL LIMITS WHICH IS 0.004MM OR 4M.
Create Concrete Framing Design
Check all member is passed or not
Now Lets Transfer the Load, Base reaction, grids or etc from Etabs to Safe22
Transfer All Load, Load cobination, Points etc
Now Open the CSI SAFE22 and goto import > select file > open
Successfully File exported
Add new material M25 Concrete, Rebar Fe500,
Add Slab property
First add footing/Pile CAP( in later i will increase the depth upto 1200mm)
First add Column ( which is stiff)( in later i will increase the depth upto 1200mm)
Also Add Plie (Dia of Pile is 500mm) (which is Footing) ( in later i will increase the depth upto 1200mm)
Calculate soil Subgrade / point Spring Constant
Piles in the springs are defined as spring so for that the spring constant
K=EA/L

E-5000 * (fck)^0.5=> 5000(25)^0.5= 25000 N/mm 2

Area of pile = (3.414 * d^2)/4 => 3.142 (500)^2/4 => 196350mm^2

L= 10000mm (10m)

K= 25000*0.7855/16-306835.9N/mm= 490875N/m => 490.875 KN/m
Soil type 3
Safe baering capacity X factored to ultimate / Maximum settlement

=> 150 X 3 / 0.05 = 9000KN/m^2
Check All Loads, Load combo, load pattern are available
Firstly Placed Pile Cap of Dim-2500mmX2500mm( Some point it will varrey)
Second Placed Coulmn of dim 450X650mm third palced piles dimension is 500mm dia
Now make Strips layers of A and B direction
Add Beam for dimes 450x500mm of material Is M25 concrete and rebar is fe 500 both bars
Assign Spring Constant on pile
Assign Soil subgrade on Pile-cap
Check Model after analysis
Punching Shear result
Reaction not much greater than 280kn
Increasing Column, Pile And Pile-CAp thickness 1200mm
Again Run Analysis
Displacement Result
Joint Reasction Data
Area shells
Base reaction
Soil Pressure
Punching Shear