Project 1

1. Design a multi-storey Residential Building located in Bangalore using STAAD Pro Connect Edition. The specification must be as follows:

Building floors	G + 6 + R
Plan dimension	B = 25m , L = 16m
Storey Height	h = 3.5m
Soil	Hard soil
Use	Residential Purpose
Safe Bearing Capacity	180 kN/m2
Maximum slab thickness	150mm

Assume suitable sections for structural elements. Follow IS456, IS1893 and IS 875

1. Prepare a Design Basis Report for the project
2. Create structural model using STAAD Pro Connect Edition
3. Prepare DL, LL, WL and EQL load calculations as per IS 875 standards
4. Design slab element using MS – Excel
5. Design beam and column element using STAAD RCDC. Attach the design calculation report.
6. Design Foundations using STAAD Foundation.
7. Prepare bar bending schedule for beam and column using STAAD RCDC
8. Attach necessary sketches and drawings wherever required.
9. All stipulations, assumptions and design parameter must adhere to Indian Standards.

AIM: To design a multi-storey Residential building which is located in Banglore using the STAAD Pro Software.

PROCEDURE:

DBR-Design Basis Report:

• GIVEN DATA:

Building Floors : G+6+R

Plan Dimension : B = 25m,L = 16m.

Story Height : h = 3.5m.

Soil : Hard Soil.

Use : Residential Purpose.

Safe Bearing Capacity : 180 Kn/sq.m.

Maximum Slab thickness : 150 mm.

• Material Specification:

Assume the size of the beams : 0.35 X 0.45 m.

Assume the size of the column : 0.70 X 0.70 m.

• Loads Calculations:

Dead Load(IS 875 Part-l):

Dead Load on Floor:

Dead weight due to slab = 0.15 X 25

=3.75 KN/sq.m

Partitions : 1.5 KN/sq.m

Floor finish : 2.5 KN/sq.m

Miscellaneous : 1 KN/sq.m

Total Floor Load = 8.75 KN/sq.m.

Dead Load on Roof (IS 875 Part-l):

Dead Load on roof slab = 3.75 KN/sq.m.

Insulation and Water proofing = 0.5 KN/sq.m.

MEP Services = 0.5 KN/sq.m.

Miscellaneous = 0.5 KN/sq.m.

Total Roof Load = 5.25 KN/sq.m

Live Load (IS 875 Part ll):

For Residential Building Live Load = 3 KN/sq.m.

For Roof Lie Load = 1.5 KN/sq.m.

Wind Load Calculation (IS 875 Part-lll):

(l) Design Wind Speed :

We know that:

Vz = Vb X k1 X k2 X k3 X k4,

where:

Vb = Basic Wind Speed (m/sec).

k1 = Risk Co-efficient (IS 875 Part-lll:2015 Table 1).

k2 = Terrain Roughness and height factor.

k3 = Topography factor (IS 875 Part-lll:2015 Clause 6.3.3).

k4 = Importance factor for cyclic region.

So,

Vb = 33 m/s (Bangaluru) IS 875 Part-lll.

k1 = 1.

k2 = 1.15 For height 30m (Category-l).

k3 = 1.

k4 = 1.

Therefore :

Vz = Vb x k1 X k2 X k3 X k4

Vz = 33 X 1 X 1.15 X 1 X 1.

Vz = 37.95 m/s.

(ll) Wind Pressure (Pz):

Pz = 0.6 X Vz ^2.

Pz = 0.6 X (37.95)^2.

Pz = 864.121 N.

Pz = 0.864 KN.

Similarly,we can calculate for the different heights just as calculated below:

Height (m)	k1	k2	k3	k4	Vz	Pz	Pz in KN
3.5	1	1.05	1	1	34.65	720.37	0.720
7	1	1.05	1	1	34.65	720.37	0.720
10.5	1	1.06	1	1	35.2	743.424	0.743
14	1	1.08	1	1	35.64	762.12	0.762
17.5	1	1.10	1	1	36.3	790.61	0.790
21	1	1.125	1	1	37.13	827.18	0.827
24.5	1	1.13	1	1	37.29	834.32	0.834
28	1	1.15	1	1	37.95	864.121	0.864

Seismic Load:

(i) Design Base Shear:

Vb = Ah X W.

where,

Ah = Horizontal co-efficient of acceleration.

W = Seismic weight.

As we know that the Ah can be calculated by the below given formula:

Ah = (Z/2) x (Sa/g) x (I/R)

So, as the iven location is Banglore,therefore:

• Seismic Zone(Z) = Zone ll (0.10)
• Soil Type(Sa) = Hard Soil.
• Importance Factor = 1 For the Residential building.
• Response Reduction Factor = 5 (MRF).

Calculation for Sa/g:

Sa/g = Design Acceleration co-efficient for different soil types.

T = 0.09 h / √d

where, h = Height of the building.

d = Base dimension of the building at the plinth level along the consideration direction of earthquake shaking,in m.

Along X-direction:

Tx = 0.09h/√d

Tx = 0.09 x 30/ 4

T= 0.68 sec

Along Z-direction:

Ty = 0.09h / √d

Ty = 0.09 x 30 / 5

T = 0.54 sec

Consider the Max. time period = 0.68 secs.

According to the IS code for Hard soil whose T value will be inbetween 0.40 sec to 4.00 sec then the value for Sa/g is 1.47.

Therefore, Sa/g = 1/T = 1.47

R = Reduction Factor.

Therefore, R = 5.0

I = Importance Factor.

I = 1

And now out all these values in the Lateral shear formula:=9%">

Ah = (0.10/2) x (1.47) x (1/5)

`Ah= 0.0147.

(b) Seismic weight of building:

(i) Dead and Live Load calculations For all Floors:

Area of each floor = 16 X 25.

= 400 sq.m.

(ll) Typical floor weight due to dead loads,DL = 8.75 Kn/sq.m.

So, total dead load of all floors = 8.75 X 400.

= 3500 KN.

(lll) Due to dead loads,Roof load,RL = 5.25 Kn/sq.m.

So.total dead load of all floors = 5.25 X 400.

= 2100 KN.

(lV) Due to live loads, Floor load,LL =3 KN/sq.m According to IS 875 Part ll.

But according to the IS 1893:2016 if the live load is greater than the 3 KN/sq.m then we have to reduce the Live Load by 50%.

Therefore reduce it by 50%.

Live Load = 1.5 KN/sq.m

Therefore, Total Live Load for all the floors = 1.5 X 400

= 600 KN.

(V) Live load for roofs. According to the IS code 1875:2016 Live load due to the roof is neglected in calculation of the seismic weight.

(Vl) Total Seismic Weight,W=DL+LL+DL of Roof

= (3500+600)X7+2100.

= 30800 KN.

Design Base Shear (Vb) = Ah X W.

where Ah = 0.0147

W = 30800 KN.

Design Base Shear (Vb) = 0.0147 X 30800.

Design Base Shear (Vb) = 452.76 KN

Lateral Force at Different Levels:

Below is the formula to calculate the lateral force at different levels according to the IS code 1893:

Storey Level	Wi	hi	Wihi^2	Ki	Lateral force,Qx	Lateral Force,Qz
Roof	2100	28	3214400	0.31	140.035	140.035
Sixth Floor	4100	24.5	2461025	0.24	108.66	108.66
Fifth Floor	4100	21	1808100	0.17	76.96	76.96
Fourth Floor	4100	17.5	1255625	0.12	54.33	54.33
Third Floor	4100	14	803600	0.07	31.70	31.70
Second Floor	4100	10.5	452025	0.044	19.92	19.92
First Floor	4100	7	200900	0.019	8.60	8.60
Ground Floor	4100	3.5	50225	0.005	2.26	2.26
	Total	102459001			442.47	442.47

DESIGN OF SLAB USING MS-EXCEL:

CREATING G+6+R Residential Building using STAAD

STEP 1

CREATE A PROJECT:

• Inorder to model the building open the STAAD pro software and create a new project by giving project name
• Select the type as "Analytical" and units as "Metric"
• Then click on create option

STEP 2

CREATING GEOMETRY:

• After creating the project a STAAD interface will open here first we need to create a geometry
• So, inorder to create a geometry we can follow several methods i have used "Structural wizard" to create my geometry
• So click on structural wizard option > a new dialog box will open here click on "file" > "select unit" > set the units to meters > then close
• Now select the model type as "Frame model" and click on "Bay Frame"

Now after selecting the bay frame a new dialog box will open here we need to give the our model height, length, and width

So the length of the model is 16m , and the width of the building is 25m and height is 26 m

• So after assigning the model dimensions the staad itself creates a model
• Then click on file and select the "Merge model with STAAd pro model"
• Finally we have created the model of residential G+6 building

STEP 3

ASSIGNING PROPERTIES:

• Now click on "Properties tab" select the "Rectangluar" option and assign the dimensions of the beam first
• The dimension of beam is 350 x 450 mm assign it and select the material as "concrete"

• Now after creating the property for beam then we need to create a property for column also
• So, again click on "Define" option and select the rectangular option
• Here we need to give our column size as 700 x 700 mm and select the material type as "concrete"

• Now inorder to assign the created property to the model first go to "select" option in ribbon then click on "Parallel" to x and z option
• Now the entire beam of our model has been selected
• Now assign the Beam property to beam member by clicking "Assign to selected beam" option

• Similarly assign the column property to the column member
• By selecting "parallel to y" option select all the column and assign the cossresponding column property

• Go to material tab and assign the material as concrete
• For both beam and column we need to assign as column so click on assign to view option and assign

STEP 4

CREATING SUPPORTS:

• To create the support go to "supports" tab and click on define option
• Now select the support as fixed support and click on add icon
• After this now we will be adding the supports to the model frame so in order to assign the support we need to go to the elevation view select all the nodes of the base level and then assingn the fixed support after adding it to the support pannel.

• Right click on screen > select cursor > node cursor > click on node cursor
• Then select all the bottom nodes then tick the assign to all selected nodes option
• Now our created support has been assigned to all nodes selected.

STEP 5

LOAD AND DEFINITIONS:

Now we will be assigning the loads applications.

• Seismic Load.
• Dead Load.
• Live Load.
• Wind Load.

In order to define and assign the dead load case for self weight,go to the loads tab in that tab there will be an option called Load case details click on that option and then click on the Add option

After clicking on that option there will be another dialouge box named as the Add New:Load Cases in that dialouge box add the Load case as Dead Load and give the tittle as Dead Load and then click on the option Add and then close.

• Now assign the created self weight to a member by clicking assign to view option

• And now define and assign the superimposed brickwall load for the typical floors,in order to do that first we need to go to the Load case detail here select the Dead load option and click on the add option.
• Then there will be another dialouge box named as the Add Loads:Load Items in that dialouge box go to the option member load and then go to the option Uniform force and put all the necessary details

• After this we will be defining and assigning the superimposed roof load in order to add the roof load repeat the same procedure and add the roof load.

• And now we will be adding the floor load in order to do that go to the load case detail and click on the add option and then there will be another dialouge box named as the Add New:Load Items and fill all the necessary details.

STEP 6

LIVE LOAD

• All the dead loads have been defined and assigned now we have to assign and define the Live Load,so in that case first we need to go to the Load Case detail just click on that option after that click on the option Add
• Then there will be another dialouge box named as the Add New:Load Cases and give the loading type as Live and tittle as the Live Load and then click on the option add and close.

• Now give the live load to the typical floors according to the IS code 875. So in order to do that first go to the option Live Load and then click on the option add and then there will be another dialouge box named as the Add New:Load Items
• In that Load item dialog box there is an option floor load just click on that option and then fill out the necessary information and then click on the add option and then close.

Click on the created roof floor as itself assigned to particular distances given.

• And now assign it to the view just as shown in the below given image:
• Now we have assigned our floor load and roof load to our model.

• And now we will be adding the seismic loadings to the frame,in order to do that click on the option load case detail and then click on the add option and add the seismic load.

STEP 7

SEISMIC DEFINITIONS

• In order to add the siesmic load first we need to go to the seismic defination option click on that option after that there will be another dialouge box named as the Add New:Seismic Definitions,
• In that dialouge box there is an option type in that box choose the IS code as IS 1893:2016 and there will be another option called Generate click on that option

- After clicking on the option Generate there will be another dialouge box named as the IS:1893 Seismic Parameters, in that dialouge box fill out the information just as shown in the below given image:

- Now add the member weight for the roof slab just as shown in the below given image:

- And after this we will be adding the floor weight just as shown in the below given image:

STEP 8

WIND LOAD

• After that we will be defining he wind load in order to define and assign the wind load go to the load case detail option click on the add option and add a new load named as the Wind Load.

• Now add the wind load according to the Calculation in accordance with the IS 875(Part-III)
• Copy the heights and corresponding intensity of wind that we have calculated in excel and paste it here and click on add.

Now add the wind case in the X-direction,add the wind factor in the both direction i.e,winndward and leeward direction

X-Windward:

• And now that all the loads have been applied here successfully to the building and now add the analysis command and run the analysis as follows
• Go to analysis tab and click on "Run analysis" we have got zero errors in analysis then go for "post processing mode"

Prepare DL, LL, WL and EQL load calculations as per IS 875 standards:

And now after doing the analysis of the model,we will be designing the Beams first using the Advance Concrete Designer (RCDC).

Design beam and column element using STAAD RCDC. Attach the design calculation report.

• In order to design the beams using the RCDC,go to the designing tab there will be an option called RCDC just click on that option and then there will be a new window of RCDC opens in that window
• Give the project details and click on create project option

• First we need to give the design inputs for that go to "settings" menu and click on "General and reinforcement" option
• Fill the reinforcement detail like concrete cover - 25mm, fy - 415n/mm2 , maximim size of aggregate - 20mm click on ok
• Then go to "Rebar curtailment" option and click on ok
• Similarly click on "Detailing and drawing" fill the details and click on ok

• After completing all the inputs click on "Auto design" option

• After this run the failure diagnosis in order to check if all the members have passed or not,so in order to do that go to the option "Reports"
• click on that option after that there will be a drop-down list in that list there will be an option called Failure Diagnosis just click on that,it will create the failure diagnosis

• And now we will be generating the reinforcement detailing of the beam,so in order to do that just go to the report option then there will be a drop-down list in that list there will be an option called Elevation
• click on that option after that there will be another dialouge box named as the Select Beam in that dialouge box select the desired beam in which we want to see the reinforcement detailing,select the beam and click on the OK option.

BEAM B5

B6

BEAM DESIGN SUMMARY

BEAM FAILURE DIAGNOISTIC

BEAM DESIGN CALCULATION SHEET:

• Similarly create a new project for column as well in RCDC
• Go to file option in RCDC click on new option then create a new project as shown below and take out the results

COLUMN DESIGN:

• Go to settings tab click on "Reinforcement setting"
• Fill the information as shown in below picture

• Click on Auto design a tab will open set the load type corresponding to load
• Then select all load right intended then click on ok

DESIGN ELEVATION OF COLUMN

Column Design Calculation

Design Foundations using STAAD Foundation.

• First of all import the file into the STAAD Pro Foundation and then define the basic information like the general information,scale things etc which is related to the foundation.
• Now after setting the basic information regarding the foundation,now we need to go to the loading and factors options,in that option we will be able to find the basic laodings and the load combinations.

DESIGN OUTPUT

BAR BENDING SCHEDULE FOR BEAM

Bar Bending schedule for column

BBS for Footing:

RESULT:

• Hence the G+6+R multi storey Residential building has been created, analyzed and designed using STAAD Pro.
• Beam Results has been taken by using STAAD RCDC Advanced concrete Design
• Foundation has been designed using STAAD Advanced Foundation