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

AIM: - To analyse and design the hostel building located in Guwahati, Assam.

INTRODUCTION: - ETABS is an engineering software product that caters to multi storey building analysis and design. SAFE represents the state of art in three-dimensional finite element technologies for structural engineering. Here, in this project we are carrying out the design analysis of a G+5 building situated in Guwahati, Assam using ETABS software and then foundation design is carried out using SAFE software.

Here we will be using different software’s to design and analyse the hostel building,

ETABS: We use ETABS software to model analysation and designing the superstructure of hostel building.

SAFE: We use the SAFE software to model analysation and designing the foundation of the building.

AutoCAD: We use AutoCAD software for the reinforcement detailing and creating construction drawings.

PROCEDURE: -

ETABS Modelling:

• Open the ETABS software first then click on new model option.
• After clicking that a dialogue box appears as Model Initialization there fill all the necessary data.
• Now new model is opened, after opening the model now we have to edit the story data and the grid data accordingly.
• After that click on New Model Quick Templates then click on grid spacing then click on Edit grid data.
• Now provide all data in the Grid system dialogue box.

• After clicking ok check on custom story data after data provide story data.

• After setting the grid system and the story data this is how look in 3D view & Plan view.

• Now we have to define material & section Properties.
• Go to the Define menu then Material Properties click on that option.
• After clicking on that click on Add new Material click on that option.

Grade M25:

• After that click on Material Property Data in that box fill the appropriate data that.

• Now click OK, M25 concrete material is added in the material list.

HYSD Grade 415:

• After that click on Material Property Data in that box fill the appropriate data that.

• Now click OK, Rebar HYSD Grade 415 material is added in the material list.

HYSD Grade 500:

• After that click on Material Property Data in that box fill the appropriate data that.

• Now click OK, Rebar HYSD Grade 500 material is added in the material list.

• Go to the Define tab then click on Section properties then click on Frame Sections.
• After that click on Add New Property option.

COLUMN (450X650 mm):

• After clicking on Add New Property click on concrete rectangular shape.
• After that click on Frame Section Property Data.
• Fill all necessary data in this dialogue box.

• In that dialogue box at the right-side of screen Modify/Show Rebar click on that option then fill all necessary data in Frame Section Property Reinforcement Data dialogue box.

• After clicking ok now click on Modify/Show Modifiers in that dialogue box put moment of inertia about 2 and 3 axis at 0.7%.

• Column is added now in that list.

BEAM (250X300mm):

• Now click on Add New Property option.
• After clicking on that option Add New Property there choose concrete rectangular shape.
• Now fill this Frame Section Property Data.

• In that dialogue box at the right-side of screen Modify/Show Rebar click on that option then fill all necessary data in Frame Section Property Reinforcement Data dialogue box.

• After clicking ok now click on Modify/Show Modifiers in that dialogue box put moment of inertia about 2 and 3 axis at 0.35%.

• Beam is added now in that list.

SLAB 150 mm Thick:

• Go to the Define menu then Section Properties then select Slab sections.
• Now click on Add New Property option.

• Fill all the necessary data in Slab Property Data dialogue box.

• Again, add on more property for staircase same procedure as slab.

• Now slab is added in the given list.

• Beam, column & slab are drawn by the using same interfaces which we have used in last challenges so here I’m showing directly image of them.

COLUMNS:

BEAMS:

SLAB:

Load Patterns:

LIVE LOADS:

• Go to the Assign menu then click on Shell Loads then select Uniform option.
• Then the Shell Load Assignment-Uniform in that dialogues box Fill the all-necessary data.
• Now select the floors add the Live loads to the structure.
• Here we will be providing 2 KN/sq.m as a live load for the rooms and the dormitories of the hostel building according to the IS 875 part 2 for the residential building.

As per the IS code for the hostel building:

• Living Rooms, Bedrooms and the Dormitories: 2 KnN/sq.m.
• Kitchen and Laundaries: 3 KN/sq.m.
• Public Lounges: 3 KN/sq.m.
• Store Rooms: 5 KN/sq.m.
• Dining Rooms, Cafeteria and Restaurants: 4 KN/sq.m.
• Office Rooms: 2.5 KN/sq.m.
• Bath and toilets: 2 KN/sq.m.
• Corridors, Passages and Staircase: 3 KN/sq.m.
• Balconies: 4 KN/sq.m.

• LIVE LOAD FOR CORRIDOR:

• LIVE LOAD FOR TERRACE:

• FLOOR FINISH:

• AAC BLOCK LOADS:

• AAC LOAD FOR TERRACE:

Now we will be assigning the loads now we will be defining the Mass source, Mass Modal and the Response Spectrum Function:

• Go to the Define option then click on Mass Source option.
• In Mass Source dialogue box click on Add New Mass Source option.

MASS SOURCE:

• Go to the Define menu then click on Load Cases option.
• Then in Load Cases diallage box there select Add New Cases.

MODAL CASE:

• Now select all the floors and then assign Diaphragm.
• Go to the Assign menu then click on Shell then select Diaphragm option.
• Now in Shell Assignment- Diaphragm dialogue box click on D1 then click Apply then ok.

DIAPHRAGM:

• Go to Define option then click on Functions then Response Spectrum option.
• Now in Define Response Spectrum Functions dialogue box there click on Add New Function and Choose Function Type to Add as IS 1893:2016.

RESPONSE SPECTRUM FUNCTION:

• Go to the define option then click on Load cases option.
• Now in Load Cases diallage box there click on Add New Cases option.

Rx:

Ry:

• Go to the define tab then Load combinations option.
• Now in Load Combinations dialogue box there click on Add Default Design Combo.

• Then in Add Default Design Combinations dialogue box click on Concrete Frame design and check on Convert to User Combinations (Editable) also then ok.

LOAD COMBINATIONS:

CHECKING THE MODEL:

RUN ANALYSIS:

MODAL RESPONSE CHECK:

STORY DRIFT CHECK:

EQx:

EQy:

BASE REACTIONS:

COMPLETE DESIGN:

LONGITUDINAL STEEL REQUIREMENT:

SHEAR REQUIREMENT:

SAFE SOFTWARE:

• First, we export the file from the ETABS software.
• Go to the option File then Export clicks on that then Story as SAFE V12.f2k File click on that option.
• Then in Options for Export to SAFE dialogue box fill their details.

• Now save the file wherever you want then now go to the SAFE software and now open that file.

GIVEN DATA:

Column Size: 450 mm X 600mm and 600mmX450mm.

Soil Type: III.

Length of the piles: 10m.

Pile Diameter: 500 mm diameter.

Load Carrying Capacity of Pile: 280 KN.

Pile Cap - Slab type _ Matt of 50 mm thickness.

Column Cap - Slap type - Stiff of 500 mm thickness.

Pile length: 16 mm

Soil Bearing Capacity: 150 KN/sq.m.

• First, we are going to define the materials and the section property.

• Then in define Materials dialogue box there click on Add New Material option.

Grade M25:

• Concrete material property is added now in the list.

HYSD 500:

• Again, go to the Define Materials dialogue box in that click on Add New Material option.

• Here the material property for rebar has been added in list.

• Go to define menu then click on Section Properties then select Slab Sections option.
• Now we will be adding the Pile Cap. After clicking the option Slab Section then in slab properties dialogue box there click on Add New Property option.

PILECAP of 800mm Thickness:

PILES of 500 mm Diameter:

STIFF COLUMN SECTION:

FRAME SECTION FOR TIE BEAMS:

• Go to Define option then click on Spring properties then click on Point Spring option.
• Then in Point Spring Properties dialogue box there click on Add New Property option.

• Then in Point Spring Property Data dialogue box fill all necessary data.

• After that select the Quick areas around the point then give the shape of the object as Rectangle slab and give the properties of Pile slab.
• Here we will be using three sizes of footing i.e., 2.5x2.5m, 6.5x4.5m and 6.5x6.5m.
• Now Place all the columns using the above procedure in order to create different sizes of footing.
• Now draw the slab using the quick tool and after creating the slab for the footing now we have to draw the piles.

• Columns are also placed as shown in the below.

• After assigning the columns assign the piles as shown in below.

• Now we have assign the spring constant also just as shown in below.

• After assigning the piles and the columns now we do the run analysis.

CHECK FOR SETTLEMENT:

• According to the IS code total settlement of 25 mm is allowable not more than that. Hence, it’s OK.

CHECK FOR PUNCHING SHEAR:

• According to the IS code the punching value should not cross unit value. In our case it is less then it’s OK.

RESULT: - The Hostel building is designed and analysed successfully by using ETABS & SAFE software.