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Reinforced Concrete Building Tutorial IS Code
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Seismic Design for Reinforced Concrete Building
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Reinforced Concrete Building
Overview
This example problem is meant to demonstrate the design of a Reinforced Concrete building structure
subjected to floor loads, wind loads and seismic loads.
Description
Seismic Design Data
- Dual system (special reinforced concrete structural walls with ordinary moment frame) in thetransverse direction
- Special moment frame in the longitudinal direction
Methodology
- Response spectrum analysis
Model
Figure 1: Reinforced Concrete Building Model
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Figure 2: Typical Floor Plan
Figure 3: Longitudinal Section
6.75
m
6.75m
6.75m
8 m 8 m 8 m 8 m 8 m 8 m 8 m
Roof
12F
11F
9F
8F
6F
7F
5F
4F
1F
3F
2F
11@
3.15m=34.65
4m
10F
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Applied Codes
- Wind Load (IS 875 – Part 3)
- Seismic Load (IS 1893 – Part 1)
- Concrete Design (IS 456)
Used Materials
- Concrete fck = M30
- Reinforcement fy = Fe415
Section Properties
- Edge columns 600 mm × 600 mm.
- Interior columns 750 mm × 750 mm.
- Beams 500 mm × 600 mm.
- Walls 450 mm. (In-plane & Out-of-plane)
Applied Loads
Gravity loads
unit: kN/m2
Use Residential Roof
Floor 2∼12 Roof
Dead Load 8 7
Live Load 2 1.5
Wind loads Basic Wind Speed: 44 m/s
Terrain Category: 3
Building Class: B
Frictional Drag Coefficient: 0.01 Risk Coefficient: 1.0
Seismic Load
Seismic Zone: Z = III (0.16)
Soil Type: II (Medium Soil)
Importance Factor: 1.0
Damping: 5%
Response Modification Coefficient
Rx: 5 (Special RC moment-resisting frame (SMRF))
Ry: 4.5 (Ductile shear wall with OMRF)
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Unit Load Cases
Load Case Number Name Applied loads
Static
Load
Cases
1 DL Self Weight + Dead Load
2 LL Live Load
3 WXWind Load
(X-direction in the global coordinates)
4 WYWind Load
(Y-direction in the global coordinates)
5 EXSeismic Load
(X-direction in the global coordinates)
6 EYSeismic Load
(Y-direction in the global coordinates)
DynamicLoad Cases
RX
Response Spectrum Seismic Load
(X-direction in the global coordinates)
RY
Response Spectrum Seismic Load(Y-direction in the global coordinates)
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Structural Modeling
1. Unit System Setting
File / New Project
File / Save (Building)
Tools / Unit System
Length > m ; Force > k N
Figure 4 Unit system Setting
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2. Materials & Section Property Input
Model / Properties / M a terial
Name > M30 Type > Concrete
Standard > IS(RC) DB > M30
Model / Properties / Section
Name > Edge Column
> Solid Rectangle
> User
H: 0.6 m ; B: 0.6 m
Name > Interior Column
> Solid Rectangle
> User
H: 0.75 m ; B: 0.75 m
Name > Beam
> Solid Rectangle
> User
H: 0.6 m ; B: 0.5 m
Model / Properties / Thickness
In-Plane & Out-of-Plane > 0.4 m
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Figure 5 Material Property Input
Figure 6 Section Property Input
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3. Create Model
Hidden (on), Node Number (on), Element Number (on)
Model / Structure Wizard / Frame
Input tab
X Coord. / Distance > 8 ; Repeat > 7
Z Coord./ Distance > 6.75; Repeat > 3
Edit tab
Material > 1 ; Section > Beam
Insert tab
Insert Point > 0, 0, 4
Rotations / Alpha > -90 .
Zoom Fit
Figure 7 : Create Frame
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Figure 8: Floor Plan
Top View
Select Window (Element 33 & 48)
Delete
Figure 9 : Floor Plan in X-Y Plane
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Generate Columns
Hidden (on), Node Number (on), Element Number (on)
Model / Elements / Extrude
Node Line ElementReverse I-J > (on)
Element Type = Beam
Material = 1 : M30
Section = 1 : Edge column
dx, dy, dz = 0, 0, -4
Select All
Figure 10 : Generate Columns
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Change Properties of Interior Columns
Work Properties Section : 1 : Edge column = Active
Display Property Property Name > (on)
Isometric View (Refer Figure 11)
Top View > Select Window > Select Interior Columns
Work Properties Section = 2 : Interior column
Drag & Drop (Refer Figure 12)
Figure 11 : Inactivate Beams
Figure 12 : “Drag & Drop” Interior Column Properties
Assign
Drag
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Generate Walls
Hidden (toggle off); Node Number (toggle on)
Display Property Property Name > (off)
Select Window (Refer Figure 13)
Active
Create Elements
Element Type : Wall
Membrane > (on)
Wall ID > Auto Inc. > 1
Material Name > 1:M30
Thickness > 1:0.4
Intersect Node > (on)
Nodal Connectivity > 50, 42, 10, 18 (Refer on Figure 14)
Select Single > Wall Element 1
Translate Element > Copy
Equal Distance (dx, dy, dz) > 40, 0, 0
Wall ID Increment = 1
Figure 13 : Location of Wall Element
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Figure 14 : Nodal Connectivity of Wall Element
Figure 15 : Generation of Wall Element
1
1
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Building Generation
Select All
Model > Building > Building Generation
Number of Copies = 11
Distance(Global Z) = 3.15
Figure 16 : Building Generation
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Generate Story Data
Model > Building > Story
Figure 14 : Generation of Story Data
Figure 17 : Story Data Generation
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4. Boundary Conditions Input
The lower ends of the columns are assumed fixed.
Model > Boundary > Supports
D –
All > (on)R – All > (on)
Select Window
Figure 18 : Boundary Supports
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5. Loading Data Input
Load > Static Load Cases
- Dead Load
- Live Load
- Wind Load (X-direction)- Wind Load (Y-direction)
- Earthquake Load (X-direction, Eccentricity direction-Positive)- Earthquake Load (X-direction, Eccentricity direction-Negative)
- Earthquake Load (Y-direction, Eccentricity direction-Positive)
- Earthquake Load (Y-direction, Eccentricity direction-Negative)
Figure 16 : Loading Data Input
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Self Weight
Load > Self Weight
Z = -1
Figure 17 : Self Weight Load
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Floor Load
Load > Define Floor Load Type- Name > Typical Floor : DL = -8 kPa, LL = -2 kPa
- Name > Roof Level : DL = -7 kPa, LL = -1.5 kPa
Load > Assign Floor Load- Load Type > Typical Floor
- Two Way Distribution- Copy Floor Load > (on)
- Axis > z (on)
- Distance > [email protected]
- Assign Nodes Defining Loading Area > (1, 8, 32, 25)
Similarly, assign floor load at roof level:- Load Type > Roof Level
- Copy Floor Load > (off)
- Assign Nodes Defining Loading Area > (385, 392, 416, 409)
Figure 18: Assign Floor Loads
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Figure 19: Floor Load Distribution
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Wind Loads
Load > Lateral Loads > Wind Loads
- Load Case Name > WX
- Wind Load Code > IS875(1987)
- Standard Method- Basic Wind Speed > 44 m/sec
- Terrain Category > III- Building Class > B
- Frictional Drag Coef. > 0.01
- Risk Coefficient> Automatic Calculation
- Class of Structure> General Buildings
- Scale Factor in Global X > 1
- Scale Factor in Global Y > 0
- Load Case Name > WY
- Scale Factor in Global X > 0
- Scale Factor in Global Y > 1
Figure 20 : Input Wind Loads
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Convert Model Weight & Loads to Masses
Model > Structure Type
- Structure Type > 3-D (on)
- Convert to X, Y (on)
- Gravity Acceleration > 9.806 (m/sec2
)
Figure 21 : Convert Model Weight to Masses
Model > Masses > Loads to Masses
- Mass Direction > X, Y (on)
- Load Type for Converting > All (on)
- Gravity > 32.1719 (ft/sec2)
- Load Case > DL- Scale Factor > 1
- Load Case > LL
- Scale Factor > 0.25
Figure 22 : Covert Model Loads to Masses
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Static Seismic Loads
Load > Lateral Loads > Static Seismic Loads
- Load Case Name > EXP
- Seismic Load Code > IS 1893(2002)
- Seismic Zone > III(0.16)- Soil Type > II (Medium Soil)
- Importance Factor (I) = 1- Damping : 5%
- Click and then OK
- Response Modification Coef. (R) > X-Dir. = 5 (Special RC moment-resisting frame (SMRF)),
Y-Dir. = 4.5 (Ductile shear wall with OMRF)
- Scale Factor in Global X = 1
- Scale Factor in Global Y = 0
- Accidental Eccentricity in X-direction > Positive (on)
- Accidental Eccentricity in Y-direction > Positive (on)
- Load Case Name > EXN
- Scale Factor in Global X = 1- Scale Factor in Global Y = 0
- Accidental Eccentricity in X-direction > Negative (on)- Accidental Eccentricity in Y-direction > Negative (on)
- Load Case Name > EYP
- Scale Factor in Global X = 0- Scale Factor in Global Y = 1
- Accidental Eccentricity in X-direction > Positive (on)
- Accidental Eccentricity in Y-direction > Positive (on)
- Load Case Name > EYN- Scale Factor in Global X = 0
- Scale Factor in Global Y = 1
- Accidental Eccentricity in X-direction > Negative (on)
- Accidental Eccentricity in Y-direction > Negative (on)
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Figure 23 : Input Static Seismic Loads
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Response Spectrum Load
Load > Response Spectrum Analysis Data > Response Spectrum Functions
Design Spectrum
- Design Spectrum > Is1893(2002)- Zone > 3
- Soil Type: Medium Soil- Damping: 5
- Importance factor(I): 1
- Response Reduction Factor(R) = 5
Figure 24 : Response Spectrum Loads
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Load > Response Spectrum Analysis Data > Response Spectrum Load Cases
- Load Case Name > RX
- Direction > X-Y- Excitation Angle = 0 (deg.)
- Scale Factor = 1
- Period Modification Factor = 1
- Function Name (Damping Ratio) > IS1893(2002) (0.05) > (on)- Interpolation of Spectral Data > Linear (on)
- Accidental Eccentricity > (on)
- Load Case Name > RY
- Excitation Angle = 90 (deg.)
Figure 25 : Response Spectrum Analysis
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6. Analysis
Analysis > Eigenvalue Analysis Control
- Type of Analysis > Eigen Vectors (on) > Subspace Iteration (on)
- Number of Frequencies = 10
- Number of Iterations = 20- Subspace Dimension = 0
- Convergence Tolerance = 1e-010
Analysis > Perform Analysis
Figure 27 : Eigenvalue Analysis Control
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Compare RX (RY) with EX (EY)
RX (RY):
Results > Result Tables > Story > Story Shear (Response Spectrum Analysis)
- Spectrum Load Cases > RX(RS) (on) & RY(RS) (on)
- Shear Force (Without Spring)
Figure 29 : Story Shear (Response Spectrum Analysis)
EX (EY):
Load > Lateral Loads > Static Seismic Loads
Load Case > EXP > Modify > Seismic Load Profile- Story Shear (on)
Similarly, select Load Cases EXN, EYP & EYN
Figure 30 : Story Shear (Static Seismic Loads)
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Design > General Design Parameter >Definition of Frame
- X-direction > Unbraced | Sway (on)- Y-direction > Braced | Non-Sway (on)
- Design Type > 3-D
- Auto Calculate Effective Length Factors > (on)
Figure 31: Definition of Frame
Design > Concrete Design Parameter > Design Code
- Design Code > IS456:2000
Figure 32: Concrete Design Code
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Design > Concrete Design Parameter > Design Criteria for Rebars (Refer Figure 33)
Figure 33 : Design Criteria for Rebars
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Design > Concrete Design Parameter > Modify Concrete Materials
Select material ID #1Rebar Selection
- Code > IS(RC)
- Grade of Main Rebar > Fe415
- Grade of Sub-Rebar > Fe415
Figure 34 : Modify Concrete Materials
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8. Design Output
Design > Concrete Code Design > Beam Design
Sorted by > Member (on)
Figure 35 : Concrete Beam Design
Design > Concrete Code Design > Column Design
Sorted by > Member (on)
Figure 36 : Concrete Column Design
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Design > Concrete Code Design > Wall Design
Sorted by > Wall ID + Story (on)
SEL (Select) > WID (Wall ID) = 1 ; Story = 1F
Graphic
Figure 37 : Concrete Wall Design