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

Aim:

To model and to analyse G+3 building with relevant seismic inputs based on the given data, using ETABS software. Also for the resultant column reactions, Deep foundations have to be designed with Piles and pilecap using SAFE software. Also Typical floor structural plan, Column rebar, Beam rebar, Pilecap rebar and Tie beam rebar need to be detailed using AutoCAD.

Given datas:

The wall are made of AAC blocks Pile capacity -280kN,M25 Concrete Fe 500 steel, Soil type 3.

Introduction:

1. Etabs is the software which is being used to create a structural model of given building.
2. In the first step note down the values of grid spacing from the given structural plans.
3. Next Create the Structural model and run the Model
4. Analyse the result and note down the result values from ETABS.
5. Next is to export the model to SAFE 2016 software in order to  design the foundations.

 Story level assignment

 

2) Grids assignment

 

3) Material concrete assignment

 

4) Material steel Fe500 assignment (for flexure design)

 

5) Material Fe415 steel assignment (for shear design)

 

6) Frame section RC beam assignment

 

7) Frame section column assignment

 

8) Slab section assignment

 

9) Mass source for seismic load calculation

 

10) Response spectrum function assignment

 

11) Load pattern assignment

 

12) Load cases assignment

 

13) default Load combination assignment

 

14) Modelling of G+3 building

 

15) Live load provision 2 KN/sq.m as per IS code 875 part-2

 

16) Floor finish 50mm thick assumed 1 KN/sq.m as per IS code 875 part-1

 

17) Wall load for AAC block material 3.5 KN/m considering 600 kg/cu.m density plastered.

 

18) After analysis and design, Storey drift for RSx case (within limit as per IS1893-2016)

 

19) Storey drift for RSy case (within limit as per IS1893-2016)

 

20) RC beam flexural rebar view

 

21) RC beam shear rebar view

 

22) RC column flexural rebar view

 

23) RC column shear rebar view

 

24) ETABS base support reactions and relevant load conditions are exported in f2k format for footing design using SAFE software

 

Modelling and Designing the Pile group foundation using SAFE software:

1) Importing the f2k file in SAFE software

 

2) concrete M25 assignment

 

3) Material Fe500 steel assignment

 

4) Slab section 500mm thick for Pile cap assignment

 

5) Frame section for Tie beam (600mm width x 500mm depth) assignment

 

6) Point spring property assignment for piles

Spring constant  = `(EA)/L`

 

7) Load combinations for SLS and ULS assignment. SLS should be used for bearing pressure check and ULS should be used for flexural design check.

 

8) Loads are verified for the base supports

 

9) Modelling of Pile cap and pile points and stiff columns

 

10) Pile spring support assignment

11) Provision of X and Y design strips

 

12) After analysing and Designing, Settlement is checked for SLS combination (within 25mm as per codal limit)

 

13) Punching shear ratio checked (found within limit as per IS456)

 

14) Pilecap bottom rebar view

 

15) Pilecap top rebar view

 

Attachment:

The ETABS model for G+3 building, Typical floor structural plan using AutoCAD, Typical Column rebar details, Typical Ground floor Beam rebar details, Pilecap rebar & Tie beam rebar details are attached along with the Project assets.

Result: 

Thus the G+3 building is modelled and designed using ETABS. Also from the extracted support reactions, the suitable pile group is modelled and designed using SAFE software