Presentation onA Study On Effect Of Column And Beam Shape And Shear Wall On Storey Drift

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5. Course No: 400
Course Name: Project and Thesis

6. Presentation on
A Study On Effect Of Column And Beam
Shape And Shear Wall On Storey Drift
Name Roll No
Khaza Ahmed Palash 36
Md. Saiful Islam 02
Md. Tahsin Raza 11
Mofasser Uddin Ahmed 42
Md. Ashraful Islam 43

7. Under the Supervision of
Pronob Kumar Ghosh
Lecturer
Department of Civil Engineering
Dhaka International University

8. Structures are designed for strength
(safety) and serviceability (performance).
Serviceability issues include
• Deflection
• Vibration
• Corrosion
But with respect to wind the issue of
concern is storey drift of structure.
Philosophy of Design for Drift

9. What is Drift?
Drift is the lateral displacement of one level of a
multi-storey structure relative to the level above
or below due to lateral loads. Lateral loads are
mainly responsible for drift.
Philosophy of Design for Drift

10. Due to lateral loads there will be a drift or
sway on the high rise structures.
The magnitude of displacement at the top of a
building relative to its base is total drift.
Shear wall is a wall composed of shear panels
to counter the gravity loads and also lateral
load performing on a structure.
Philosophy of Design for Drift

11. To study the performance of column shape
(with shear wall & without shear wall) on
storey drift.
 To study the effects of moment of inertia of
beams (with shear wall & without shear wall)
on storey drift.
The Objective Of This Thesis

12. Drift Index
 Drift index = Displacement/Height
 Total Drift Index = Total Drift/Building Height = Δ/H
 Interstorey Drift Index = Interstorey Drift/Storey Height= δ/H

13. Building Model
 The model is a rectangular (60 ft by 100 ft plan
dimensions) ten-storey RCC building.
 Column size 18”x18”, 15”x22” & 12”x27” and
keeping beam size constant 12”x21”.
 Similarly we analyze the structure with varying beam
size 12”x21”, 12”x24” & 12”x27” and keeping
column size constant 15”x22” .

14. Dead Load & Live Load Calculation
Dead load is considered as per follows-
 Floor to floor height = 10 ft
 Brick wall width = 5 inch
 Concrete unit weight = 150 pcf
 Brick unit weight = 120 pcf
 Super Dead Load = 80 psf
Live Loads: Live loads are as per BNBC 2015-
 On floor = 60 psf
 On roof = 30 psf

15. Calculation Of Wind Load
Storey
No
Wind Load
(kip)
Along X axis Along Y axis
1 60.94 29.18
2 68.86 32.98
3 78.88 37.78
4 88.58 42.42
5 92.14 44.12
6 97.95 46.91
7 100.86 48.3
8 106.68 48.3
9 109.59 52.48
10 104.42 50.01

16. Distribution of Wind Load in Each
Storeys
Wind load (kip) in X axis each storeys
104.42
109.59
106.68
100.68
97.95
92.14
85.58
78.88
68.86
60.94

17. Distribution of Wind Load in Each
Storeys
Wind load (kip) in Y axis each storeys
50.01
52.48
51.09
48.3
46.91
44.12
42.42
37.78
32.98
29.18

18. Analysis of Models
For 10 storied building:
 Varying moment of inertia of column by keeping area
constant without shear wall.
 Varying moment of inertia of column by keeping area
constant with shear wall.
 Varying moment of inertia of beam without shear wall.
 Varying moment of inertia of beam with shear wall.

19. Varying Moment of Inertia of
Column by Keeping Area Constant
without Shear Wall

20. Frame Structure (Without Shear
Wall) Deformed Shape in Y
Direction

21. Values of Storey Drift from ETABS
Analysis Without Shear Wall
Storey
No
Storey Drift for
Column 18”X18”
(in)
Storey Drift for
Column 15”X22”
(in)
Storey Drift for
Column 12”X27”
(in)
10 2.063680 1.934297 1.828990
9 2.017466 1.885431 1.775832
8 1.935825 1.804882 1.694307
7 1.813128 1.686343 1.577664
6 1.649461 1.529137 1.424584
5 1.446155 1.334380 1.236034
4 1.205651 1.104648 1.014916
3 0.931231 0.844129 0.766515
2 0.630216 0.561935 0.501720
1 0.320962 0.279240 0.243556

22. Shear Force and Bending Moment
Diagrams for Column Size 18”x18”

23. Varying Moment of Inertia of Column by
Keeping Area Constant with Shear Wall
First, we analyze for column size 18”x18”= I, then 15”x22” =
1.5I & finally 12”x27” = 2I

24. Frame Structure (With Shear Wall)
Deformed Shape in Y Direction

25. Storey Drift From ETABS Analysis
With Shear Wall
Storey
No
Storey Drift for
Column 18”X18”
(in)
Storey Drift for
Column 15”X22”
(in)
Storey Drift for
Column 12”X27”
(in)
10 1.249830 1.180958 1.080565
9 1.147117 1.084847 0.975356
8 1.034555 0.979150 0.860315
7 0.911980 0.863640 0.735717
6 0.779660 0.738545 0.603471
5 0.639608 0.605781 0.467087
4 0.495516 0.468873 0.331638
3 0.352653 0.332927 0.204275
2 0.218379 0.205130 0.094651
1 0.102490 0.095171 0.016791

26. The Unfactored (DL+LL) Reactions
in Various Columns
Node Column 18”x18” Column 15”x22” Column 12”x27”
No. (kip) (kip) (kip)
1 264.8 202.60 201.47
2 448.94 393.02 388.93
3 415.98 358.90 355.13
4 203.6 166.58 165.68
5 451.5 401.37 404.93
6 783.69 781.48 784.03
7 724.34 713.54 716.23
8 392.89 334.94 339.20
9 421.21 368.57 369.39
10 729.77 716.61 714.27
11 649.75 625.13 623.07
12 288.23 231.36 233.95
13 421.92 369.42 370.27
14 729.53 715.88 712.99
15 493.86 463.07 458.51
16 451.41 401.82 405.43
17 783.57 781.29 783.74
18 720.26 709.25 711.51
19 386.40 328.09 330.97
20 265.26 204.08 203.28
21 449.76 394.01 390.14
22 417.35 360.60 357.22
23 230.56 167.15 166.44

27. Values of storey Drift from ETABS Analysis for
Varying Moment of Inertia of Column by Keeping
Area Constant (With Shear Wall)
Storey Storey Drift for Storey Drift for Storey Drift for
No Column 18”X18” Column 15”X22” Column 12”X27”
(in) (in) (in)
10 1.249830 1.180958 1.080565
9 1.147117 1.084847 0.975356
8 1.034555 0.979150 0.860315
7 0.911980 0.863640 0.735717
6 0.779660 0.738545 0.603471
5 0.639608 0.605781 0.467087
4 0.495516 0.468873 0.331638
3 0.352653 0.332927 0.204275
2 0.218379 0.205130 0.094651
1 0.102490 0.095171 0.016791

28. Values of Storey Drift from ETABS
Analysis for varying moment of inertia
of Beam without Shear Wall
Storey Storey Drift for Storey Drift for Storey Drift for
No Beam 12”X21” Beam 12”x24” Beam 12”X27”
(in) (in) (in)
10 2.576689 2.330019 2.133819
9 2.493304 2.256773 2.068338
8 2.371324 2.148103 1.969906
7 2.200977 1.995497 1.831112
6 1.980257 1.797428 1.650811
5 1.710642 1.555279 1.430305
4 1.396499 1.272780 1.172870
3 1.045915 0.956645 0.884192
2 0.675318 0.295376 0.275686
1 0.319377 0.052771 0.049583

29. Values of storey Drift from ETABS
Analysis for varying moment of
inertia of beam with shear wall
Storey Storey Drift for Storey Drift for Storey Drift for
No Beam 12”X21” Beam 12”x24” Beam 12”X27”
(in) (in) (in)
10 0.910768 0.854072 0.806581
9 0.816781 0.768789 0.728431
8 0.711453 0.672160 0.639004
7 0.602932 0.571939 0.545679
6 0.492309 0.469043 0.449238
5 0.381093 0.364825 0.350904
4 0.273072 0.262839 0.254033
3 0.173722 0.168298 0.163601
2 0.090663 0.088571 0.086748
1 0.032886 0.032538 0.032232

30. Effect of column Shape on Storey
Drift (without shear wall)
0
0.5
1
1.5
2
2.5
0 2 4 6 8 10 12
StoreyDriftinYDirection(inch)
Number of Storey
Effect Of Column Shape On storey Drift (Without Shear Wall)
18”X18”
15”X22”
12”X27”

31. Effect Of Column Shape On Storey
Drift (With Shear Wall)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 2 4 6 8 10 12
storeyDriftinYDirection(inch)
Number of storey
Effect of column Shape on storey Drift (with shear Wall)
18”X18”
15”X22”
12”X27”

32. Effect of Beam Size on Storey Drift
(without Shear Wall)
0
0.5
1
1.5
2
2.5
3
0 2 4 6 8 10 12
StoreyDriftinYDirection(in)
Number of storey
Effect of Beam Size on Storey Drift (without shear wall)
12”X21”
12”x24”
12”X27”

33. Effect of Beam Size on Storey Drift
(with Shear Wall)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 2 4 6 8 10 12
StoreyDriftinYDirection(in)
Number of storey
Effect of Beam Size on Storey Drift (with shear wall)
12”X21”
12”x24”
12”X27”

34. Conclusions
To control drift, rectangular section performs
better.
Shear wall is essential for drift control.
Without shear wall, drift hampers
serviceability condition.

35. Recommendations
 Columns should be placed in the plan such a way that it
behaves like a shear wall in weak direction.
 To control the lateral drift effectively, the structural
system, consisted of reinforced concrete shear wall,
moment resisting system can be used.
 The position of shear wall in lift core close to the centre
of plan is important, to promote the efficiency of
structural system.

36. Thank You