Project 2_Design & 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

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

ANSWER:-

Aim:- To design and analysis of G+3 Hostel building in ETABS .

Procedure:-

Step:-1

• First we have to oprn the ETABS software.
• Next click on the file option at the left side top corner and select the new model, as shown below.

• After selecting the new model the new tab opens, in that tab we have to select 'Use Built-in Settings with' option, as shown below.
• After setting the model Initialization the templates tab will opens and, select the Grid only and press ok.
• Next we need to do the settings in Grid system data, as shown below.

• Next we need to add the stories upto 3 story in the Story Data, as shown below.

Step:-2

• Next the plan views are visible in the etabs screen, as shown below.
• Next we need to open the 3d-view, as shown in the below figure.

Step:-3

• Next we need to open define option and select MATERIAL properties, as shown below.
• After selecting the material properties the new tab appears, then we add new materials by selecting the Add new material option, as shown below.

Step:-4

• Now we need to add material type as concrete and grade as M25.
• Next we need to check the material property data, as shown below.
• Now we need to add new material type as rebar and grade as HYSD Grade 500.
• Next we need to check the material property data, as shown below.
• Now we need to add new material type as rebar and grade as HYSD Grade 415.
• Next we need to check the material property data, as shown below.
• Hence the materials are assigned, as shown below

Step:-5

• Now we need to select the section properties and click on the frame sections, as shown below.

• electing the frame sections the new tab will be visible, in that we need to select the Add New Property, as shown below.
• After selecting the Add New Property, the new tab appears.
• In that new tab we select the Rectangular shape type in concrete, as shown below.
• Next the frame section property data will be visible, In that we add beam size as B450x650, as shown below.
• Next we need to select the Modify/Show Rebar option as shown below.
• After selecting the Modify/Show Rebar option the new tab appears, In that we select the design type as M3 Design only (Beam).
• Next we select longitudinal bars with the grade of HYSD500.
• Next we select Confinement bars with the grade of HYSD415.

Step:-6

• Next we have to add the column size as 450X650 in the frame section property data, as shown below.
• Again we have to add the another column size as 650X450 in the frame section property data, as shown below.

Step:-7

• Next we select the slab section option from the section properties, as shown below.
• Next the slab properties tab will be vissible, In that we select the Modify/Show Property option, as shown below.
• After selecting the Modify/Show Property option, the new tab appears.
• In that we need to put the slab name as Slab 125, it means slab with the thickness of 125mm.
• And we take the concrete grade as M25, as shown below.
• Next we have to click the ok option.
• Now we take the slab thickness separately for staircase with the thickness of 200mm, as shown below.
• Hence the Slab properties are assigned, as shown below

Step:-8

• Next we need to add the columns using the Quick draw columns option, as shown below.

Step:-9

• Next we need to add the beams using the Quick draw beams option, as shown below.

Step:-10

• Next we need to add the slabs using the Quick draw floor/wall option, as shown below.

Step:-11

• Now we go to the base plan and select all base joints.
• Next we select the Restraints from joint option, as shown below.

• Now we need to select the fixed joint and click on apply and then click on close button, as shown below.

Step:-12

• Next we need to select the load patterns from the define option, as shown below.
• Now we should add Dead load, live load, Brickwall load, and earthquake load, 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 lll, 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:-13

• Now we select the object type option, as shown below.
• After selecting the object type option, the new tab will be visible, In that select the floors and click on the select button and close.
• Next we have to click on the assign option and then select shell loads, from the shell loads we select the Uniform option, as shown below.
• Here we need to consider the live load upto the 3rd floor with 2kN/m^2, as shown below.

Step:-14

• Next we select the object type option, as shown below.
• After selecting the object type option, the new tab will be visible, In that select the beams and click on the select button and close.
• Next we have to click on the assign option and then select frame loads, from the frame loads we select the Distributed option, as shown below.
• Then after the new tab will appear, In that we select load pattern as Brickwall and take the uniform load as 3.5 kNmkNm, and then click on the apply button and close.
• Now we click on the toogle option to view the loads acting on the story, as shown in the below figure.

Step:-15

• Next, from the define option we select the mass source, as shown below.

• In the mass source tab, we select Modify/Show Mass Source option.
• Next we add the load patterns in the Mass Source Data, as shown below.

Step:-16

• Next, from the define option we select the load combinations, as shown below.
• After selecting the load combinations the new tab is visible, In that we select 'Add Default Design Combos' option.
• Next we select concrete frame design in the Add Default Design Combinations, as shown below.
• Now we can see here that the load combinations are visible, as shown below.

Step:-17

• From the 'select' option we select 'object type' option, as shown below.
• After selecting the object type option, the new tab will be visible, In that select the floors and click on the select button and close.
• Next we have to select the Diaphragms from the shell option, as shown below.
• After selecting the diaphragms the new tab will appear, in that select D1 and click on the apply button and close.
• Hence the diaphragms are assigned, as shown below.

Step:-18

• Next, from the define option we select the Modal Cases, as shown below.
• After selecting the Modal cases the new tab is visible, In that we give modal case name as Modal 1 & we give the maximum number of modes as 20, as shown below.

Step:-19

• Next we have to check the model by clicking the check model option, as shown below.
• Next the check model tab will appears, In that select the all options and click on the ok button.
• After the model is checked, then the warning tab will be visible and it tells that there is no warning messages, as shown below.

Step:-20

• Now we have to do the run analysis, as shown below.

Step:-21

• After Run Analysis we select the 'show deformed shape' option, then the new tab appears.
• In the deformed shape tab, we select Earthquake load in the load case.
• Next we see the deformed shape of the structure with the Earthquake loads.
• Similarly, we have to do this for all the remaining loads.

Step:-22

• Next we have to start the Beam design and Column design by selecting the 'Start Design/Check' option, as shown below.

Step:-23

• After completion of the beam design and column design, we need to select the 'Display Design Info' option, as shown below.
• After selecting the 'Display Design Info' option the new tab appears, In that we select the Longitudinal Reinforcing in the Design Output and click on the OK button, as shown below.
• Next the longitudinal reinforcement details will appear, as shown below.