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Municipal Presentation Sarad Dahal.pptx
1. STRUCTURAL DESIGN OF
RESIDENTIAL CUM COMMERCIAL BUILDING
AT SINAMANGAL, KATHMANDU
1
Presented By:
Er. Saumya Shrestha
NEC No: 15850 Civil ‘A’
Owner :
Mr Sarad Dahal
2. Contents
• Objective/Scope of Works
• Introduction
• Analytical Modeling
• Analysis of Building (Linear Static/Dynamic Analysis)
• Analysis Output
• Typical Structural Design and Drawing
• Foundation Design
2
3. • The main objective of this study is to perform Detail structural
analysis and Seismic design of the Residential Cum Commercial
Building.
3
Objective
4. • To develop 3D analytical finite element model.
• Analyze finite element model to acquire adequate size and
reinforcement in structure elements.
• To prepare structural drawings as per the output of 3D analytical
finite element model.
4
Scope of Works
5. Proposed plan of Residential Cum Commercial Building is
located at Sinamangal, Kathmandu.
Building consists of 1 storey basement+6 stories.
Typical floor area is = 2164.5 sq.ft.
Typical storey height of the building is 2.74 m (9ft)
Plan dimension of building
L = 21.94m , B =7.69m, H = 19.304m
L/B = 2.85, H/B = 2.51
5
Introduction
11. Analytical Model & Geometrical sizes
ETABS V20 automatically design
Beam and Column
Analysis using NBC 105:2020
Design and Ductile Detailing using IS
456:2000, NBC 105:2020
11
Structural
System
Element
Structural Element Sizes Grade of
Concrete Typical Component
Types
Structural
Wall
System
Foundation 2’-8” M 25 RC sections
Column
2’ x 3’, 2’ x 2’, 1’6” x 2’,
2’x2’6”,
M 30
RC sections
Basement
Shear Wall
9” M 30
RC sections
Beam
9”x12”, 14”x22”, 14”x18”,
6”x18”, 9”x16”, 12”x18”,
9”x18”
M 30
RC sections
Infill Walls
9” Local
Brick
Non load bearing
walls
18. Zone factor, Z = 0.35 (for Kathmandu)
Importance Factor I = 1.25
Soil Type = D
Structural System: Reinforced Concrete Moment
Resisting Frame
Ductility factor Rμ = 4
Over Strength factor for ULS Ωμ = 1.5
Over Strength factor for SLS Ωs = 1.25
18
Seismic Parameters
19. Building Height (for time period calculation)
H=16.46m;
Fundamental Time Period:
Empirical method
Tx,Ty = 0.075 (h^0.75) = 0.613 Sec (Frame System)
Tx/y = 0.766 sec (Amplified Time period)
Rayleigh method
Tx,Ty =
Tx/y = 0.655/0.643 sec
Adopted time period for analysis: Tx/y = 0.655/0.643 sec
19
Fundamental Time Period:
(NBC 105:2020)
20. Seismic Horizontal Coefficient (Cd(T1)):
C(T1) = Ch(T) Z I = 2.25 * 0.35 *1.25= 0.9844
Cd(T1) = 0.9844/(4*1.5) = 0.1641
Seismic Wt. of Building = 16061 KN
Horizontal Base Shear = 2635.61 KN
20
Ultimate Limit State
Serviceability Limit State
Seismic Horizontal Coefficient (Cd(T1)):
Cs(T1) = 0.2 C (T1) = 0.2 * 0.9844 = 0.1969
Cd(T1) = 0.1969/(1.25) = 0.1575
Seismic Wt. of Building = 16061 KN
Horizontal Base Shear = 2529.61 KN
21. • Moment of Inertia of Column 0.7 (NBC 105:2020)
• Moment of Inertia of Beam 0.35
• Since, ETABS considered G=E/(2*(1+µ))=0.4*E. Thus for shear
stiffness, full shear stiffness of the section is to be used.
21
Crack Section Analysis
22. 1.2DL + 1.5LL
DL + λLL ± EQx/y
Where λ = 0.6 for storage facilities
= 0.3 for other usage
22
Load Combination for design
(NBC 105:2020)
23. Structural Analysis Output
Checking with NBC 105:2020
• Static & Dynamic Base Shear
• No. of Mode
• Modal Participating Mass Ratio
• Natural Frequency
• Story Drift Ratio
• Torsion Irregularity
• Stability Index
• Soft Story
• Mass Irregularity
• Eccentricity
• Serviceability Check
23
26. Storey Drift Ratio
Drift ratio < 0.025 (Cl. 5.6.3, NBC 105:2020) for Ultimate
26
Floor
Ductility
Factor
Loading Direction
Story
Drift
Design Storey
Drift
Condition Loading Direction
Storey
Drift
Design
Storey Drift
Condition
0 Ground Floor 4 EQx X 0.00055 0.0022 OK EQy Y 0.000123 0.000492 OK
1 First Floor 4 EQx X 0.002419 0.009676 OK EQy Y 0.002203 0.008812 OK
2 Second Floor 4 EQx X 0.003206 0.012824 OK EQy Y 0.003301 0.013204 OK
3 Third Floor 4 EQx X 0.00341 0.01364 OK EQy Y 0.003397 0.013588 OK
4 Fourth Floor 4 EQx X 0.003387 0.013548 OK EQy Y 0.003238 0.012952 OK
5 Fifith Floor 4 EQx X 0.003107 0.012428 OK EQy Y 0.002877 0.011508 OK
6 Top Floor 4 EQx X 0.002478 0.009912 OK EQy Y 0.002356 0.009424 OK
Ultimate Limit State
Storey Drift Limiting value not exceeding : 0.025
27. Storey Drift Ratio
Drift ratio < 0.006 (Cl. 5.6.3 NBC 105:2020) for Serviceability
27
Floor Loading Direction Storey Drift Condition Loading Direction Storey Drift Condition
0 Ground Floor EQx X 0.000528 OK EQy Y 1.18E-04 OK
1 First Floor EQx X 0.002321 OK EQy Y 0.002115 OK
2 Second Floor EQx X 0.003077 OK EQy Y 0.003168 OK
3 Third Floor EQx X 0.003273 OK EQy Y 0.003261 OK
4 Fourth Floor EQx X 0.003251 OK EQy Y 0.003108 OK
5 Fifith Floor EQx X 0.002982 OK EQy Y 0.002761 OK
6 Top Floor EQx X 0.002378 OK EQy Y 0.002261 OK
Serviceability Limit State
0.006
Limiting value not exceeding :
Storey Drift
28. Torsion Irregularity
Δmax < 1.5 Δmin (Cl. 5.5.2.1, NBC 105:2020)
Δmax/(Δmax+ Δmin) <1.2 28
Maximum Average
Check
mm mm <1.2
6 Top Floor EQx ULS LinStatic 1 X 49.607 45.28 1.096 OK
5 Fifith Floor EQx ULS LinStatic 1 X 42.816 39.093 1.095 OK
4 Fourth Floor EQx ULS LinStatic 1 X 34.421 31.712 1.085 OK
3 Third Floor EQx ULS LinStatic 1 X 25.217 23.568 1.07 OK
2 Second Floor EQx ULS LinStatic 1 X 15.987 15.327 1.043 OK
1 First Floor EQx ULS LinStatic 1 X 7.256 7.106 1.021 OK
6 Top Floor EQx SLS LinStatic 1 X 47.612 43.459 1.096 OK
5 Fifith Floor EQx SLS LinStatic 1 X 41.094 37.521 1.095 OK
4 Fourth Floor EQx SLS LinStatic 1 X 33.037 30.436 1.085 OK
3 Third Floor EQx SLS LinStatic 1 X 24.203 22.62 1.07 OK
2 Second Floor EQx SLS LinStatic 1 X 15.344 14.711 1.043 OK
1 First Floor EQx SLS LinStatic 1 X 6.964 6.82 1.021 OK
6 Top Floor EQy ULS LinStatic 1 Y 47.615 46.597 1.022 OK
5 Fifith Floor EQy ULS LinStatic 1 Y 41.152 40.214 1.023 OK
4 Fourth Floor EQy ULS LinStatic 1 Y 33.285 32.504 1.024 OK
3 Third Floor EQy ULS LinStatic 1 Y 24.43 23.835 1.025 OK
2 Second Floor EQy ULS LinStatic 1 Y 15.144 14.756 1.026 OK
1 First Floor EQy ULS LinStatic 1 Y 6.124 5.955 1.028 OK
6 Top Floor EQy SLS LinStatic 1 Y 45.7 44.723 1.022 OK
5 Fifith Floor EQy SLS LinStatic 1 Y 39.497 38.597 1.023 OK
4 Fourth Floor EQy SLS LinStatic 1 Y 31.946 31.196 1.024 OK
3 Third Floor EQy SLS LinStatic 1 Y 23.448 22.876 1.025 OK
2 Second Floor EQy SLS LinStatic 1 Y 14.535 14.162 1.026 OK
1 First Floor EQy SLS LinStatic 1 Y 5.878 5.715 1.028 OK
Directio
n
Ratio
Torsion Irregularity Check
Story
Output
Case
Case Type
Step
Number
29. Stability Indices for checking P- Δ
Column is classified as non-sway if stability indices (Qsi) ≤ 0.04. (IS 456,
Annex E)
30
32. Storey Stiffness
(Cl. 5.5.1.2, NBC 105:2020)
33
Load Case Stiffness Check Load Case Stiffness Check
Floor Load kN/m kN/m
0 Ground Floor EQx 2793132.258 - EQy 11901473 -
1 First Floor EQx 427670.926 OK EQy 457440.67 OK
2 Second Floor EQx 312823.578 OK EQy 310935.93 OK
3 Third Floor EQx 268248.614 OK EQy 244638.43 OK
4 Fourth Floor EQx 218114.295 OK EQy 204047.96 OK
5 Fifith Floor EQx 164250.887 OK EQy 151498.12 OK
6 Top Floor EQx 86340.391 OK EQy 83294.564 OK
Storey Stiffness
33. Mass Irregularity check
(Cl. 5.5.1.5, NBC 105:2020)
34
Mass Wi+1<1.5xWi
Floor kg
1 First Floor 194202.03 -
2 Second Floor 200978.28 OK
3 Third Floor 211468.17 OK
4 Fourth Floor 198463.43 OK
5 Fifith Floor 193109.29 OK
6 Top Floor 83999.46 -
Mass Irregularity
34. Eccentricity check
(Cl. 5.7, NBC 105:2020)
35
Storey XCCM YCCM XCR YCR X diff (CM CR)Y diff (CM CR) % X % Y
m m m m m m
1 First Floor 2.9555 11.1953 3.9116 10.0278 0.9561 1.1675 12.42% 5.32%
2 Second Floor 3.0575 10.9302 3.9166 10.534 0.8591 0.3962 11.16% 1.81%
3 Third Floor 3.1043 10.9255 3.9083 11.0416 0.804 0.1161 10.45% 0.53%
4 Fourth Floor 2.945 11.1647 3.8968 11.3639 0.9518 0.1992 12.37% 0.91%
5 Fifith Floor 3.1464 10.6388 3.8975 11.6001 0.7511 0.9613 9.76% 4.38%
6 Top Floor 3.4757 10.409 3.8493 11.3743 0.3736 0.9653 4.85% 4.40%
Eccentricity Calculation
40. Geometrical Sizes of Structural
Elements
41
Structural
System
Element
Structural Element Sizes Grade of
Concrete Typical Component
Types
Structural
Wall
System
Foundation 2’-8” M 25 RC sections
Column
2’ x 3’, 2’ x 2’, 1’6” x 2’, 2’x2’6”, M 30
RC sections
Basement
Shear Wall
9” M 30
RC sections
Beam
9”x12”, 14”x22”, 14”x18”,
6”x18”, 9”x16”, 12”x18”, 9”x18”
M 30
RC sections
Slab
5” M30
RC section
Infill Walls
9” Local Brick Non load bearing
walls