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Reinforced Concrete Building Tutorial IS Code



Seismic Design for Reinforced Concrete Building

1

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




2

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


6 EYSeismic Load

(Y-direction in the global coordinates)

DynamicLoad Cases

RX

Response Spectrum Seismic Load


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




13

Figure 14 : Nodal Connectivity of Wall Element

Figure 15 : Generation of Wall Element

1

1




14

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




Figure 38 : Typical Output of Concrete Wall Design

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