Project 1_Comparative study of different storey buildings for Seismic forces
Aim - To do Comparative Analysis of different storey buildings for Seismic forces
Introduction -
1) ETABS is an engineering software product that caters to multi-story building analysis and design.
2) Modeling tools and templates, code-based load prescriptions, analysis methods and solution techniques,
all coordinate with the grid-like geometry unique to this class of structure.
3) Basic or advanced systems under static or dynamic conditions may be evaluated using ETABS.
4) For a sophisticated assessment of seismic performance, modal and direct-integration time-history analyses
may couple with P-Delta and Large Displacement effects.
5) Different building geometries behave differently when induced by the same seismic forces.
6) Hence, it is very important to properly understand the response of buildings related to their structural
configurations for a safer design approach.
7) Therefore in this project, we have modeled different buildings with varying geometries using ETABS.
8) Furthermore, their responses are analyzed with the help of the software and the results
are then compared to grasp an understanding of the structural behavior of buildings with different storeys.
1) Structural Element Sizes - For Building type A
i) Beams - 300 × 400 mm
ii) Columns - 400 × 400 mm
iii) Slab - 150 mm thick
2) Material Properties -
i) Grade of Concrete - M30
ii) Grade of Steel Reinforcement Bars - Fe 415
iii) Dead Load on beams from infill wall : 10 kN/m (Let us assume the same for roof floor in view of parapet)
iv) Live load on floor : 3 kN/m2 (Let us assume the same for roof floor)
Procedure -
1) For Building type A -
Step i)
i) Open the Etabs software from deskstop icon
ii) Once software is open - Click on New model
Step 2)
i) Once you click on New model
ii) A Model Initialization setting will open
iii) Select - Metric SI units
iv) Select section database - Indian
v) Select Steel code - IS 800-2007
vi) Select Concrete design code - IS 456-2000
Step 3)
i) Once you click Okay
ii) A following dialog box of grid settings will open
ii) In New Model Quick templates under grid dimensions select the custom grid spacing
iii) Once you click on Custom grid spacing
iv) Click on Display grid data as spacing
Step 4)
i) In New Model Quick templates under Story dimensions
ii) Select the custom story data and then click edit story data.
iii) Now input the storey details
iv) As given in question and Story 1 was selected as the Master story
v) Click on Okay .
Step 5)
i) Once you click on Okay
ii) A plan and 3D view of model is created in model space
Step 6)
i) Now we have to define the materia properties
ii) Click on Define
iii) Click on Material properties
iv) Add New material as Concrete
v) Select Grade of conccrete - ...........................( given)
vi) Standard as Indian
vii) Click on Okay .
viii) Click on okay
ix) The remaining data is as per IS code
Step 7)
i) Similarly we have to define the materia properties for Steel
ii) Click on Define
iii) Click on Material properties
iv) Select New material as Rebar
v) Select Grade of Steel - HYHD - Grade Fe415...................... ( given)
vi) Standard as Indian
vii) Click on Okay .
viii) Click on Okay
ix) The remaining data is as per IS code
x) Material properties is added
Step 8)
i) Now we have to Define the section properties ( Column and Beam )
ii) Click on Define
iii) Select - Section properties
iv) Click on Frame Section
v) Click on Concrete - Rectangular
vi) Click on Add new property
vi) Give property name - Beam 300x400............( given)
vii) Material type - M30
viii) Section Shape - Concrete Rectangular
ix) Depth - 400 mm
x) Width - 300 mm
xi) Click on Modify / show Rebar
xii) Select M3 Design Only (Beam)
xiii) Select the rebar materials as HYHD Fe415 in both the direction
xiv) Click on okay .
xv) Similarly we have to follow the same steps for Column also.
xvi) Property name - Column 400 x 400 mm
xvii) Material - M30
xviii) Depth - 400 mm
xix) Width - 400 mm
xx) Click on Modify / show Rebar
xxi) Select M3 Design Only (Column)
xxii) Select the Rebar materials as HYHD Fe415 in both the direction
xxiii) Click on okay .
Step 9)
i) Now we have to define Slab properties
ii) Click on Define
iii) Select Section Properties - Select Slab properties
iv) Click on Slab Section
v) Give property name - Slab 150
vi) Slab material - M30
vii) Modeling Type - Membrane
viii) Type - Slab
ix) Thickness - 150 mm
Step 10)
i) Now we have keep the 3D view also to see the properties
ii) Now we have to add the columns and beams
iii) Click on Quick Draw Column option
iv) Select the Column properties which we have defined earlier
v) Draw the columns at the grids as shown in below
vi) Note that - All stories option should be selected which is at the Bottom
vii) Similarly we have to draw beams also
viii) Select Quick Draw Beam option
ix) Select the Beam properties which we have defined earlier
x) Draw the beam as shown below
Step 11)
i) Now we have to add the slabs
ii) Select Quick draw floor
iii) Draw the slabs as shown below
iv) 3D view after assigning the material and section properties
Step 12)
i) Now we have to assign the loads
ii) Select Define
iii) Click on load patterns
iv) Define load pattern dialogue box will open
v) Add the Following loads and Select the IS code for Seismic Case as IS -1893
Step 14)
i) Now we have to apply the live loads.
ii) In Assign menu- Select Shell Loads
iii) Click on Uniform loads
iv) Load Pattern as - Live load
v) Load - 3 Kn/`m^2`
vi) We can see that Floor load has been assigned to all the floors
vii) Now we have to assign Brick wall load for beams
viii) Select Assign
ix) Click on Frame loads- UniformlyDistributed loads
x) Select load pattern as Brick wall
xi) Apply 10 Kn/m load ........................................................(given)
xii) Load has been assigned
Step 14)
i) Now we have to assign Mass source for Modal calculations
ii) Click on Define menu
iii) Select mass source options
iv) Mass source dialogue box will open
v) Add the loads
vi) Dead load - 1
vii) Brick wall - 1
viii) Live load - 0.25 ( Because we only considered some fraction of Live load in calculation of seismic weight )
So live load , upto 3 Kn/m2 - 25%
above 3 Kn/m2 - 50%
Step 16)
i) Now we have to assign Load combinations
ii) For that Click on Define menu
iii) Select Load Combinations
iv) Load Combination box will open
v) Click on Add Default Design Combos
Step 17 )
i) Now we have to assign Diaphragm
ii) Click on Assign
iii) Select Shell - Select Diaphragm
iv) Select D1
v) Click on Apply
vi) Click on Ok
vii) A Diaphragm has been assigned
Step 17)
i) Now we have to create a Modal Analysis
ii) Click on Define
iii) Select Modal cases
iv) Click on Modify
v) Load Case Name - Modal
vi) Load case type - Eigen
vii) Mass Source - Which we have already defined
viii) Click on Okay
Step 19)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 19)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 20)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
2) For Building Type - B
Step 1)
i) For Building type B we don't need to follow the same steps
ii) Just make a copy of building A and Save it as Building B
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 5 -story building
iii) Beam : 300mm x 400 mm
iv) Column : 400mm X 400 mm
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2
Step 3)
i) Click on new file, go to edit - story and grid data.
ii) Click on the modify story data option.
iii) Then, right-click on the top story and select the add story option.
iv) Set the height and the number of storeys you want to add.
v) In our case, we need to add 3 more floors to convert our 2 story building into a 5 story one.
vi) Also, make sure to make each story similar to the master story created in Model A.
vi) Click on okay
vii) A 3D view of 5 storey model -
Step 4)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 5)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 6)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
3) For Building Type - C (G+5 with column orientation in X-direction)
Step 1)
i) For Building type C we just need to edit the Column Orientation
ii) Just make a copy of building B and Save it as Building C
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 5 -story building
iii) Beam : 300mm x 400 mm
iv) Column : 550 mm X 300 mm
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2
Step 3)
i) Edit the Column Size and Orientation
ii) Click on Edit - Column section
iii) Click on Define - section properties - frame section.
iv) Select the previously created column for building A and B.
v) Click on the modify/show properties option.
vi) Rename the column as 550mmx300mm.
vii) Enter the depth and width of columns
viii) So, select the column section
ix) Then Click on assign
x) Select Local axis - rotate it by 90 degrees.
xi) This way, all the columns shall be oriented in the X-direction meaning 550mm laying down in the x direction .
Step 4)
i) Once you click on Okay
ii) The columns will be oreinted in X direction
Step 5)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 6)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 7)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
4) For Building Type - D (G+5 WITH COLUMN ORIENTATION IN THE Y-DIRECTION)
Step 1)
i) For Building type D we need to edit the Column Orientation
ii) Just make a copy of building C and Save it as Building D
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 5 -story building
iii) Beam : 300mm x 400 mm
iv) Column : 300 mm X 550 mm
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2
Step 3)
i) In this model, we don't need to edit the column dimensions other than the column orientation.
ii) The sizes of the column will remain the same
iii) But , we have to shift the column orientation from X to Y direction.
iv) Then, select the column section
v) Click on Assign - Select the local axes and bring the origin back to 0.
v) Therefore , all the columns shall be oriented in the Y-direction.
Step 4)
i) Once you click on Okay
ii) The columns will be oreinted in Y direction
Step 5)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 6)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 7)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
5) For Building Type - BUILDING "E" (G+10)
Step 1)
i) We have to create a New Model
ii) For that make a copy of Model D and save it as Model E
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 10 -story building
iii) Beam : 300mm x 400 mm
iv) Column : Bottom 5 = (600 mm X 600 mm )
Top 5 = ( 400 x 400 mm )
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2
Step 3)
i) Once you save the Model D as Model E
ii) Edit the storey and add 5 more storey just like previously we have done
Step 4)
i) Now we have to add the Different column section properties
ii) For Bottom 5 storey -600mm x 600 mm
iii) For Top Storey - 400mm x 400 mm
iv) Add the properties in Column section
v) Define - Section - Frame Section and Add the properties
Step 5)
i) So go to Visualise setting
ii) Select only Columns
iii) Untick the beams and columns
iv) So it will be easy for us
Step 6)
i) Now we have to assign the properties to the bottom storey
ii) For that we have to set the limits for bottom floors and top floors
iii) For that go to Edit - Set building limits.
iv) The set building limit option in ETABS allows you to view only the floors that you need to work on.
v) Hence, first set the limit to bottom 5 - select all columnsand assign and assign them the required column section.
vi) Similarly repeat the procedure for the remaining top columns and complete with the model.
vii) Column 600 mm x 600 mm has been assigned to bottom storey
vii) Set the building limits to Top floors
viii) Column properties has been assigned to the model
Step 7)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 8)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 9)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
6) For Building Type -BUILDING "F" (G+10)
Step 1)
i) We have to create a New Model
ii) For that make a copy of Model E and save it as Model F
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 10 -story building
iii) Beam : 300mm x 400 mm
iv) Column : (600 mm X 600 mm )
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2
Step 3)
i) Once you save the Model E as Model F
ii) In this model we don't need to edit the storey as it has same storey
Step 4)
i) Only we have to edit that Column Size
ii) As it has Uniform Column Size ( 600 mm x 600 mm)
iii) Properties are already added in section properties
Step 5)
i) So go to Visualise setting
ii) Select only Columns
iii) Untick the beams and columns
iv) So it will be easy for us
Step 6)
i) Select all the Columns as shown below
ii) Assign the Column section as 600 mm x 600 mm
Step 7)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 8)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 7)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
7) For Building Type - BUILDING G (G+25)
Step 1)
i) We have to create a New Model
ii) For that make a copy of Model F and save it as Model G
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 25 -story building
iii) Beam : 300mm x 400 mm
iv) Column : Bottom 10 = (800 mm X 800 mm )
: Upper 10 = ( 600 x 600 mm )
: Top Upper = ( 400 x 400 mm)
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2
Step 3)
i) Once you save the Model F as Model G
ii) Edit the storey and add 15 more storey just like previously we have done ( G+25 )
iii) Follow the same procedure for editing the storey
iv) 3D view -
Step 4)
i) Now we have to add the Different column section properties
ii) For Bottom 10 storey -800mm x 800 mm
iii) For Upper Storey - 600mm x 600 mm
iv) For Top Upper Storey - 400mm x 400 mm
v) Add the properties in Column section
vi) Define - Section - Frame Section and Add the properties
For Top Upper Storey
For Bottom 10 storey
For Upper Storey
Step 5)
i) So go to Visualise setting
ii) Select only Columns
iii) Untick the beams and columns
iv) So it will be easy for us
Step 6)
i) Now we have to assign the properties to the bottom storey
ii) For that we have to set the limits for bottom floors and top floors
iii) For that go to Edit - Set building limits.
Building Limits for Botom 10 Storey
Building Limits for Upper Story
Building limits for Top Upper storey
vii) Set the building limits to Top floors
viii) Column properties has been assigned to the model
Step 7)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
step 8)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 9)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
8) For Building Type - BUILDING "H" (G+25)
Step 1)
i) We have to create a New Model
ii) For that make a copy of Model G and save it as Model H
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 25 -story building
iii) Beam : 300mm x 400 mm
iv) Column: (800 mm X 800 mm )
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2
Step 3)
i) Once you save the Model G as Model H
ii) In this mode we don't need to edit too much
iii) We just need to change the Column properties as ( 800mm x 800mm ) which is uniform
Step 4)
i) Only we have to edit that Column Size
ii) As it has Uniform Column Size ( 800 mm x 800 mm)
iii) Properties are already added in section properties
Step 5)
i) So go to Visualise setting
ii) Select only Columns
iii) Untick the beams and columns
iv) So it will be easy for us
Step 6)
i) Now we have to assign Column to the model
ii) Select all the column from Select - Object type - Column
iii) Select the properties ( 800mm x 800 mm)
iv) Click on Okay .
v) Column properties has been assigned to the model .
Step 7)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 8)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 9)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
9) For Building Type - BUILDING "J" (G+25)
Step 1)
i) We have to create a New Model
ii) For that make a copy of Model H and save it as Model J
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 25 -story building
iii) Beam : 300mm x 400 mm
iv) Column: (800 mm X 800 mm )
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2 ( Increased the load by 10% )
= 3 x 10%
= 0.3
Therefore total Live Load = 3.3 kn/m
In case of Mass Source - Take the live load as 0.50
viii) Live load - 0.50 ( Because we only considered some fraction of Live load in calculation of seismic weight )
So live load , upto 3 Kn/m2 - 25%
above 3 Kn/m2 - 50%
Step 3)
i) Model J is similar to the Model H
ii) So we do not have to edit the anything regarding proprties
iii) Only we have to increase the Live Load by 10%..............................( given )
iv) For that Select the Slab - Select - Object type - Slab 150
Step 4)
i) Now we have to edit the Load
ii) For that Click on Assign - Shell Loads - Click On Uniform Load
iii) Click on Replace the Existing Load
iv) Enter the load - 3.3 Kn /m2
v) Check if load is applied or not
Step 5)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 6)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 7)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
10) For Building Type - BUILDING "K" (G+25)
Step 1)
i) We have to create a New Model
ii) For that make a copy of Model J and save it as Model K
Step 2)
i) Edit the Story data as follows - ( which are given )
ii) 25 -story building
iii) Beam : 300mm x 400 mm
iv) Column: (800 mm X 800 mm )
v) Grade M30 - Fe 415 .
vi) Brick wall load = 10 Kn/m
vii) Live load 3 KN/m^2 ( Increased the load by 20% )
= 3 x 20%
= 0.6
Therefore total Live Load = 3.6 kn/m
In case of Mass Source - Take the live load as 0.50
viii) Live load - 0.50 ( Because we only considered some fraction of Live load in calculation of seismic weight )
So live load , upto 3 Kn/m2 - 25%
above 3 Kn/m2 - 50%
Step 3)
i) Model K is similar to the Model J
ii) So we do not have to edit the anything regarding proprties
iii) Only we have to increase the Live Load by 20%..............................( given )
iv) For that Select the Slab - Select - Object type - Slab 150
Step 4)
i) Now we have to edit the Load
ii) For that Click on Assign - Shell Loads - Click On Uniform Load
iii) Click on Replace the Existing Load
iv) Enter the load - 3.6 Kn /m2
Step 5)
i) Before Run Analysis we have to check the model
ii) Click on Analyze
iii) Click on Check Model
iv) A structure is verified without any error and Model has been checked .
Step 6)
i) Now Click on Run Analysis
ii) Once the analysis is done you will see the deform shaped as below
Step 7)
i) Now we have to check the mode as per IS 1893 .
ii) For that click on Display - Show tables
Results - All the 10 buildings were modelled and analyzed successfully .
a) Effect of stiffness on T: Compare fundamental natural periods of buildings E & F as well as G & H.
Why is there a marginal or significant difference in the fundamental natural periods?
| Model Type | No of Stories | Column Configuration | Results | Conclusion |
| Building E | 10 |
Upper 5 Storeys = 400 x 400 mm
Bottom 5 Storeys = 600 x 600 mm |
1.534 |
As we could see that by changing the column sizes there will not be any effect on Natural Perid , it remains Same |
| Building F | 10 |
Column Size - 600 x 600 mm Uniform throught Building |
1.534 | |
| Building G | 25 |
Column Sizes Bottom 10 Story ( 800mm X 800 mm ) Upper 10 Story ( 600 mm X 600 mm ) Top upper 5 Story ( 400 mm x 400 mm) |
3.766 |
As we could see that in i) Building H has uniform column section but it has more natural time period = 3.97 sec ii) Where as Building G has large column at its base and reduces as we go higher level . But it has less natural time period as compared to H = 3.76 sec So we can conclude that providing larger size of column at base and reducing the size at highr level will reduces the Natural time period |
| Building H | 25 |
Column Size - 800 x 800 mm Uniform throught Building |
3.97 |
b) Effect of mass on T: Compare fundamental natural periods of buildings H, J and K. Have the buildings become more
flexible or stiff due to change in mass?
| Model Type | No of Stories | Percentage increase in Load ( Mass) | Results | Conclusion |
| Building H | 25 |
Load is taken as 3 Kn/m2 |
3.97 sec
|
As we could see that time period is increases as we increases the load or mass Therefore Time period is directly proportional to the Mass of the building |
| Building J | 25 |
Load increases by 10% ( 3.3 Kn/m2) |
4.011 sec | |
| Building K | 25 |
Load increases by 200% ( 3.6 Kn/m2) |
4.044 sec | |
c) Effect of Building Height on T: How does the fundamental natural periods of Buildings A, B, F and H change
with change in building height?
| Model Type | No of Stories | Height of Building | Results | Conclusion |
| Building A | 2 |
7.5 m |
0.478 sec
|
As we could see that the height of the building increases the natural time period is also increases
Therefore, the natural period 'T' is also directly proportional to the building height. |
| Building B | 5 |
16.5 m |
0.934 sec | |
| Building F | 10 |
31.5 m |
1.534 sec | |
| Building H | 25 | 76.5 m | 3.97 sec |
d) Effect of Column Orientation on T: How does the fundamental natural periods of Buildings B, C and D change
with change in column orientation?
| Model Type | No of Stories | Column Orientation | Results | Conclusion |
| Building B | 5 |
Equal in Both Direction ( 400 x 400 mm ) |
0.934 sec
|
As we could see that when column is orientated in X and Y direction there is not much difference in Time period . So we can say that In Y direction Lateral Displacement is more as compared to X direction . |
| Building C | 5 |
In X direction ( 550 x 300 mm ) |
0.99 sec | |
| Building D | 5 |
In Y direction ( 300 x 550 mm ) |
0.95 sec |
e) Effect of Flexural Stiffness of Structural Elements on mode shapes: Compare fundamental mode
shape of Building B in two situations when the flexural stiffness of beams relative to that of adjoining columns
is very small versus when it is large
| Model Type | No of Stories |
Flexural Stiffnesss of Beam |
Results | Conclusion |
| Building B | 5 |
100 % |
0.934 sec
|
If you decrease the flexural stiffness of beams, the overall flexural strength of the beam is also going to reduce which increases the Natural Time Period . |
|
10 % |
1.96 sec |
f) Effect of Axial Stiffness of Vertical Members on mode shapes: Compare the fundamental mode shape of Building H in
two situations when the axial cross-sectional area of columns is very small versus when it is large.
| Model Type | No of Stories | Axial Stiffnes of Columns | Results | Conclusion |
| Building H | 25 |
100 % |
3.97 sec
|
As the axial stiffness of columns decreases, the fundamental natural period of the building increases regardless of its structural geometry |
|
10% |
4.46 sec |
g) Effect of Degree of Fixity at column bases on mode shape: Compare the fundamental mode shape of
Building B in two situations when the base of columns is pinned versus when it is fixed.
| Model Type | No of Stories |
Base Support |
Results | Conclusion |
| Building B | 5 |
Pinned |
0.934 sec
|
As we can see that in pinned support natural time period is more as compared to Fixed support . Therefore Fixed support will provide more resistance as compared to Pinned support |
|
Fixed |
0.58 sec |