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

Plan View and 3D of the same is as belowIn 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

                                                                                           DESIGN AND ANALYSIS OF A HOSTEL BUILDING AT GUWAHATI ASSAM  

             - 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

Aim:

             - To carryout modelling, analysis, design, and preparation of construction drawings of a G+3 RCC building situated in Guwahati Assam.

Introduction:

             - ETABS is an engineering software product that caters to multi strorey building analysis and design.

             - SAFE represents the state of art in three dimensional finfite element technologies for structural engineering.

             - Here, in this project we are carrying out the design analysis of a G+3 building situated in Guwahati, Assam using ETABS software and then foundation design is carried out using SAFE software.

                                                                                        Model In ETABS

Procedure:

          Step 1: Open ETABS and model initiation:

                    - Initially open the ETABS application and click on the new model option from the file menu.       

                    - Now in the model initiation window desired units, Design codes which are to be used was selected and then click OK.

          Step 2: To draw grids and storeys:  

                    - In New Model Quick templates under grid dimensions select the custom grid spacing and then click edit grid data.

                    - The grid dimensions were inserted according to drawing file as follows and click OK.

                                   

                    - In New Model Quick templates under Story dimensions select the custom story data and then click edit story data.

                    - Now input the storey details as given in question and story 3 was selected as the master story and was applied to rest story and then click OK.

                    - Plan View and 3D of the same is as below

          Step 3:Define material Properties: 

                    - Now to define the properties of elements, go to define menu and then select material properties. The grade of concrete was selected and click ok.

                                                    

                    - The material property data dialogue box will show up, ensure all the data’s are correct and then click Ok at the bottom.

                    - Similarly HYSD 500and HYSD 415 steel was added.

                    - Steel and Concrete properties was added to the list now as shown and then click OK.

          Step 4: Define Section properties: 

                    - To add frame members like beams, columns and slab go to Define Properties- Section Properties- frame sections options. From the frame properties dialogue box click on add new property option.

               a) Beam section properties:

                    - From the frame property shape type select the rectangular concrete option and click OK.

                    - Beam details was provided as shown in figure and then click on Modify/ Show reinforcement under reinforcement section.

               Beam reinforcement data’s:

                    - Select M3 Design Only (Beam) and chose the rebar materials as shown and click OK.

           b) Column section properties: 

                    - In the similar manner apply the column data’s as shown below

                  * Column reinforcement data:

               * Frame properties

               c) Slab properties:

                    - To design the slab initially For Select Slab section from the section properties under Define menu.

                    - Select add new property option.

                    - Slab properties like thickness and other details are added as shown below and then click OK.

                       Slab properties:

           Step 5: Draw Model:

                    - So all the properties of frame members have been added correctly, now we have to place the structural members. For this select quick draw column option from the tools available at the left side of the screen and place the columns at all the grid intersections. Also select all storeys at the right bottom of screen to apply it to all storeys.

                     - After placing columns, Beams (the quick draw beams option beams) was placed followed by slabs (Quick draw floor option slabs).

          Step 6: Assign support: 

                    - Now to Change the base connections initially go to the base view in the plan and select the base view. Now in assign tab- select joints- restraints. Now from the dialogue box that appears select fixed connections and then click OK.

          Step 7:Define load cases:                  

                    - To assign loads to the structure, select define followed by load patterns to open the Define load pattern dialogue box.

                    - The various loads which are applied are as shown below

                    - Next we need to select EQx and click on the Modify Lateral Load, then the new tab appears.

                    - In this tab select X Dir and As per the IS 1893:2002, the seismic zone factor for Guwahati, Assam is taken as 0.36, as mentioned in the below table.

                    - And we need to select site type as III, as shown below.

                    - Next click on the ok button.

                    - Similarly, do this for all the seismic loads such as EQx+, EQx-, EQy, EQy+, EQy-

          Step 8: Assign loads:

                    - In order to assign the loads, select the frame in which AAC brick wall falls and provide 3.5kN/m^2

                    - Live loads were applied to slabs next.

                    - As per IS 875 in residential buildings its 2kn/m^2 for rooms and bathrooms.

                    - In the same way select slabs to assign floor finish which is 1Kn/m^2 for all rooms

          Step 9: Define mass source:

                    - To assign mass source to model follow these steps.

                    - In define menu select mass source options to open the mass source dialogue box.

                    - Now select Modify mass source data option and click OK

                    - Now mass source data was provided as shown and load pattern was also added to it.

           Step 10: Assign Response spectrum:

                    - Response Spectrum was defined next.

                    - New function was defined as per the IS 1893 for response spectrum analysis.

           Step 11: Add RS Load Case:

                    - It was defined for both RSx and RSy

           Step 12: Assign Load combinations:

                    - Select add default design combos option

                    - Tick on concrete frame design and convert to user  combinations option.

                    -  The default load combinations are now loaded

           Step 13: Assign diaphragm:

                    - To assign diaphragm to the model follow these steps:

                    - In assign menu select Shell followed by Diaphragm to open the shell Assignment diaphragm dialogue box

                    - Select D1 from the diaphragm assignments and click apply followed by OK.

                    - The Diaphragm D1 is applied and is as shown below.

           Step 14: Check model:

                    -  To check the model for errors, go to Analysis tab and select check model.

           Step 15: Run analysis:

                    -  After the analysis of the model by run model

           Step 16:Storey response plot:

                    -  For this go to Display-Story Response Plot- Maximum Storey drift

           Step 17: Design concrete reinforcement:

                     -  Beam design check is performed by selecting the Start design/check option

                    - From the design display info option select the longitudinal reinforcement option

                    - Beam Shear Reinforcement

                    - Column Longitudinal Reinforcement

                    - Column Shear Reinforcement

                    - In order to export the ETABS model into SAFE click on file – Export – Story as SAFE V12.f2k file option

           Step 18:Save model:

                    -  Save the file to desired location

                                                                                        Model In SAFE

           Step 1: Import file in SAFE:

                    - Now open SAFE and import the F2K file

                    -  The file is now ready to work in SAFE

           Step 2: define materials:

                    - Materials for concrete (M25) and Rebars Fe 415 and Fe 500) was defined next as shown.

            Step 3: Define Slab properties:

                    -  Slab properties was defined next like the Pile Cap, Pile and Column

            Step 4: Draw geometry:

                    - The pile caps, Piles and Columns was applied next

            Step 6: Define and assign soil properties:

                    - Soil properties was assigned next as shown

            Step 7: Define spring constant and aasign to model:

            Step 8: Check design prefernce and Run analysis:

                    - Recheck for design preferences and run the design analysis

            Step 9: Check reult of dis[pacement , punching shear and reactions:

                    - From the display option  select show punching shear design or press F10.

                    - If value is less than 1 its safe, If its greater than 1 then we have to increase the pile cap size

            Step 10: Calculate R/F requirement by using design strips:

                                                           

                                                           

                    - In the display menu click on Show slab design and then apply the settings as shown and click apply.

                      Slab strip design results for both layer A abd B:

Results:

                    - G+3 hostel was designed and analysed in ETABS

                    - Foundations was designed and analysed in SAFE

                  All the check are done as per IS 13920-2016

                                          i) Column Dettail Reinforcement

                                                          

                                                          

                                           ii) Beam Dettail Reinforcement:

                                                                  

                                                               

                                           iii) Pile Cap Reinforcement :