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

PROJECT-2

                   DESIGN AND ANALISIS OF HOSTEL BUILDING OF ASSAM GUWAHATI

 

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 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

 

 AIM:

To design and analysis of G+3 hostel building in ETABS and Foundation in CSI SAFE.

Introduction :

• The procedure and anaylsis and design of given building will depend on the type of building, its complexity, the number of stories etc.
• First architectural drawings of the building are studied, structurl systems is finalised sizes of structural members are decided and brought to the knowledge of the concerned architect.
• The procedure for structural design will involve some steps which will depend on the type of building and also its complexity and time availabel fr structural desgn.

Following data is need before designing the structural design:-

1.  A set of architectural drawings
2.  Soil investigation report
3.  Location of place or city in order to decide wind and sesimic load condition
4.  Data for lifts, water tank on top of the building and roof loadong ad its features.

 

PROCEDURE:

ETABS Modelling:

• In order to design and analyse the hostel building first thing that we have to do is to open the ETABS software.
• After opening the ETABS software there will be an option called New model click on that option.
• After clicking that option there will be a dialouge box named as Model Initialization and in that dialouge box fill the necessary data regarding the codes that we are going to use to design the given hostel building just as shown in the below given image.

                                   

• New model has been opened,so after opening the model now we have to edit the story data and the grid data accordingly.
• After that there will be another dialouge box named as New Model Quick Templates,in that dialouge box there will be another option called Custom Grid Spacing check on that option after that there is another option called Edit Grid Data.

                 

• And now there will be another dialouge box named as the Grid System Data,in that dialouge box provide the grids in both the direction according to the give architectural plan.

                 

• After adding the grids now we will be adding the stories as this building is G+5 building now add the stories there is a dialouge box named as the New Model Quick Templates,in that dialouge box there will be another option called Custom Story Data check on that option after that there is another option called Edit Story Data.

                 

• After this there will be another dialouge box named as the Story data,in that dialouge box edit the number of stories and the stories height and other relevant data.

                         

• After setting the grid system and the story data this is how it will be looking like in the plan view and the 3D view.

             

• After this now we will be defining the Materials and the Section Properties.
• So in order to assign the materials we first need to go to the Define menu then there will be another option called Material Properties click on that option.
•  After clicking on that option there will be a dialouge box named as the Define materials in that dialouge box there will be an option called Add new material.

                                            

• After that there will be another dialouge box named as the Add New Material Property in that dialouge box fill the all appropriate data in that dialouge box.

 

                                 

• After that there will be another dialouge box named as the Material Property Data in that dialouge box fill the appropriate data that we need in designing purpose.
• In that dialouge box name the material as M25 and all the other data.

                                             

• And then click OK, M25 concrete material has been added in the material list.

                                          

• After adding M25 now we have to add the rebar material,so i order to do that go to the Define material dialouge box click on the option Add New Material.

                                             

• After this there will be another dialouge box named as the Add New Material Property in that dialouge box fill the all appropriate data in that dialouge box.

 

                                 

• After that there will be another dialouge box named as the Material Property Data in that dialouge box fill the appropriate data that we need in designing purpose.
• In that dialouge box name the material as HYSD Grade 415.

                                       

• And then click OK, Rebar HYSD Grade 415 material has been added in the material list.

                                      

• After adding HYSD Grade 415 now we have to add the another material,so in order to do that go to the Define material dialouge box click on the option Add New Material.

                                             

• After this there will be another dialouge box named as the Add New Material Property in that dialouge box fill the all appropriate data in that dialouge box.

 

                               

• After that there will be another dialouge box named as the Material Property Data in that dialouge box fill the appropriate data that we need in designing purpose.
• In that dialouge box name the material as HYSD Grade 500.

                                                   

• And then click OK, Rebar HYSD Grade 500 material has been added in the material list.

                                     

• Now that all the materials have been added in the list now we have to define the section properties. 
• So in order to define the section properties just go to the Define tab there will be a drop-down list and in that list there will be an option called Section properties click on that option after that there will be another drop-down list in that list there will be another option called Frame Sections just click on that option.                                       
• After this there will be a new dialouge box named as the Frame Properties,in that dialouge box there is an option called Add New Property.

                                     

• Now we will be adding the sections properties like beam,columns etc.

COLUMN (450 mm X 650 mm):

• So after clicking on the option Add New Property there will be another dialouge box named as the Frame Property Shape Type,in that dialouge box choose the shape of the column here I will be choosing rectangular shape.

                            

• After that there will be another dialouge box named as the Frame Section Property Data. 

 

                      

• In that dialouge box there is another option at the right-side of screen and that option is Modify/Show Rebar just click on that option then there will be another dialouge box named as Frame Section Property Reinforcement Data.

                               

• And now again in the same dialouge box there is another option called Modify/Show Modifiers,so in that dialouge box put moment of inertia along 2 and 3 axis as 0.7% because for the column moment of inertia reduces by 0.7% according to the IS code.

                                 

BEAM 250mm X 300 mm:

• So in order to add the beam into the list then go to the Frame Properties,in that dialouge box there is an option called Add New Property.
• Now we will be adding the sections properties for the beam 250 mm X 300 mm.
• So after clicking on the option Add New Property there will be another dialouge box named as the Frame Property Shape Type.

                            

• After that there will be another dialouge box named as the Frame Section Property Data just as shown in the below given image:

 

                                     

•  In that dialouge box there is another option at the right-side of screen and that option is Modify/Show Rebar just click on that option then there will be another dialouge box named as Frame Section Property Reinforcement Data.

                             

• And now again in the same dialouge box there is another option called Modify/Show Modifiers,so in that dialouge box the moment of inertial along 2 and 3 axis as 0.35% because in the beams the moment of inertia reduces to 0.35% according to the IS code.

                                

SLAB 150 mm Thick:

•  Now we will be adding the slab, and to add the slab first do to the Define menu then there will be a drop-down list in that list there will be an option called Section Properties.
•  After this there will be another dialouge box named as the Slab Properties,in that dialouge box there is an option called Add New Property.

                                       

• After this there will be another dialouge box named as Slab Property Data.

                                           

• And for the staircase we will be providing slab of 175mm thickness,and to add the slab for the staircase we will have to add the new property.

                                      

                                     

• After adding the section properties now we will be drawing slab,columns and the beams in the given plan by using quick draw tool which is provided in the software.

 

COLUMNS VIEW:

 

      

       

• BEAMS VIEW:

 

       

               

• SLAB VIEW:
  

 

         

           

• And now we will be assigning the load patterns:

Load Patterns:

         

LIVE LOADS:

•  In order to assign the loads we need to go to the Assign menubar in that there will be a drop-down list in that list there will be an option called Shell Loads. 
•  Then there will be a new dialouge box named as the  Shell Load Assignment-Uniform,in that dialouge box Fill the all relevant data.
•  Now seelect the floors and 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 buiding.
• As per the IS code for the hostel building:

 

                              

  

LIVE LOAD FOR CORRIDOR:

                                         

LIVE LOAD FOR TERRACE:

                                     

     

FLOOR FINISH:

                                        

AAC BLOCK LOADS:

                                  

       

AAC LOAD FOR TERRACE:

                                      

   

• In order to define the mass source the first thing that we need to do is that go to the Define option and there will be a drop-down list.
• After that there will be another dialouge box named as Mass Source and in that dialouge box there is an option called Add New Mass Source.

                                    

• After that there will be another dialouge box named as Mass Source Data.

MASS SOURCE:

                    

• After assigning the mass source we will be assiging the Modal case.
• And in order to do that first go to the Define menu then there will be drop-down list in that list there is an option called Load Cases.
• Then there will be another dialouge box named as Load Cases in that dialolouge box there will be an option called Add New Cases.

                             

• Then there will be another dialouge box named as the Load Case Data,in that dialouge box fill the data just as shown in the below given image:

MODAL CASE:

                                 

• And now we will be defining the Diaphragm.
• Firstly select all the floors and then assign Diaphragm. 
• So in order to assign the diaphragm,we first need to go to the option Assign then there will be a drop-down list in that list there is an option called Shell click on that option then there will be another list in that list there will be an option called Diaphragm.

                                                     

DIAPHRAGM:

• And now we will be assigning the Response Spectrum.
• In order to assign the response spectrum just go to the option Define and then there will be a drop-down list in that list there will be an option called Function just click on that after clicking on that option there will be another list in that list there will be an option called Response Spectrum.

                                             

• After this there will be another dialouge box named as Define Response Spectrum Functions,in that dialouge box there will be an option called Add New Function and Choose Function Type To Add as IS 1893:2016.

                                            

• After that there will be another dialouge box named as the Response Spectrum Function Definition- IS 1893-2016.

RESPONSE SPECTRUM FUNCTION:

                                 

• And now we have to define the Load Cases, in order to define the load cases first go to the define option then there will be a drop-down list in that list there will be an option called Load cases.
• Then there will be another dialouge box named as Load Cases in that dialolouge box there will be an option called Add New Cases.

                             

• Then there will be another dialouge box named as the Load Case Data.

                                       

 

                                       

• And now we will be defining the load combinations.
• And in order to define the load combination just go to the define tab there will be a drop-down list in that list there will be an option called Load combinations.  
• And then there will be a new dialouge box named as Load Combinations in that dialouge box there will be an option called Add Default Design Combos.

                            

                                                  

LOAD COMBINATIONS:

                      

• And now we will be checking the models if there are any warnings,if there are then correct the warnings and if not and go ahead with the planning. 

CHECKING THE MODEL:

                                         

RUN ANALYSIS:

                          

MODAL RESPONSE CHECK:

                           

STORY DRIFT CHECK:

EQx:

                                

EQy:

                          

BASE REACTIONS:

                                 

COMPLETE DESIGN:

 

LONGITUDINAL STEEL REQUIREMENT:

                        

SHEAR REQUIREMENT:           

                 

•  And now we will be moving to the last part of the designing that is foundation designing using the SAFE software.

SAFE SOFTWARE:

• First we need to export the file from the ETABS software.
• So in order to export the file from the ETABS software,first go to the option File then there will be an option called Export click on that then there will be another list in that list there will be another option called Story as SAFE V12.f2k File.

                                        

• Then there will be another dialouge box name as Options for Export to SAFE.

                                     

• Now save the file according to our preferences and now go to the SAFE software and now open the 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.

• So the first step is to define the materials and the section property. 
• After that there will be another dialouge box named as the Define Materials.

                                         

• After this there will be another dialouge box named as Add New Material Property.

                                

                                               

                                       

• Now we will be adding another property for the rebars.
• Once again go to the dialouge box the Define Materials,in that dialouge box there ia an option called Add New Material.

                                         

• After this there will be another dialouge box named as Add New Material Property.

                                   

 

                                        

                                        

• And now we will be adding the section properties.
• So in order to add the section properties first we need to go to the define bar then there will be a drop-down list in that list there is an option called Section Properties click on that option from the list after that there will be another list named as the Slab Section.   
• So now we will be first adding the Pile Cap. So after clicking the option Slab Section then there will be another dialouge box named as the slab properties in that dialouge box there will be another option called Add New Property.

                              

• Then there will be another dialouge box named as th Slab Property Data.

PILECAP of 800mm Thickness:

                                       

PILES of 500 mm Diameter:

                                              

STIFF COLUMN SECTION:

                                                   

FRAME SECTION FOR TIE BEAMS:

                                   

• After that we have to define the Point Spring property and in order to do that just go to the option Define and then there will be a drop-down list and in that list there is an option called Spring properties click on that option and after that there will be another list in that list click on the option Point Spring.

                                 

                                       

                                                         

• After that select the Quick areas around the point,then there will be a dialouge box and in that dialouge box 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.
• 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.           
•  Columns also have been placed as shown in the below given image,

                                

• After assigning the columns assign the piles just as shown in the below given image,

        

• Now we have assign the spring constant.

 

                                                       

CHECK FOR SETTLEMENT:

• According to the code book a total settlement of 25 mm is allowable not more than that. So the allowable settlement in our case is less than the permissible allowable limit. Hence OK.

                              

CHECK FOR PUNCHING SHEAR:

•  According to the IS code the punching value should not cross unit value,so in our case the punching shear value is less than the unit value.Hence OK.

                                    

RESULT:

• G+3 Hostel building design is designed and analyse in ETABS.
• The foundation is designed and analyse in SAFE.