Analysis and Design of 3D RC Building

Using SAP2000

SAP2000 Tutorial Example ACECOMS, AIT

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Analysis and Design of 3D RC Building

Using SAP2000

Table of Content

Objective................................................................................................................................................3

Problem .................................................................................................................................................3

Modeling, Dynamic Analysis of RC Building .....................6

Step-by-Step Solution .........................................................................................................................6

1. Start Model from Template................................................................................ 6

2. Define Material Properties................................................................................. 8

3. Define Frame Sections....................................................................................... 9

4. Define Slab Sections........................................................................................ 12

5. Define Load Cases ........................................................................................... 13

6. Modify Frame .................................................................................................. 14

7. Copy Floor 1 to Floor 2-5................................................................................ 18

8. Assign Slab Loads ........................................................................................... 19

9. Assign Beam Loads ......................................................................................... 20

10. Assign Dynamic Loads................................................................................ 21

11. Start Analysis............................................................................................... 21

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Objective To demonstrate and practice step-by-step on the modeling, dynamic analy-sis and design of 5 story reinforced concrete building.

Problem Part A:

Carry out the modeling, dynamic analysis and design of 5 story rein-forced concrete building subjected to static loads (UBC94 response spec-trum load in Y direction).

Material Properties Strength of concrete (Fc’) = 4 ksi Yield strength of main reinforcement (Fy) = 60 ksi Yield strength of shear reinforcement (Fys) = 60 ksi Young Modulus of concrete ( Ec) = 3600 ksi

Loading

Load Cases Type Details

DEAD Dead load Use Self Weight Multiplier

SUPERDL Dead load Slabs: 35 psf Beams: 250 plf

LIVE Live load Slab: 100 psf

SPEC1 (for Part B) Dynamic load UBC94 response spectrum in Y direction

Slab Section

Reinforced concrete solid slab, thickness = 6 inch

Frame Sections

20"

20"

12"

24"

Colum n(C1)

Beam(B1)

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3D View of the building

Plan and Elevation View Plan View at Roof Foor

20'

20'

20'

20'20'20'

C1 C1 C1

C1 C1 C1 C1

C1 C1 C1 C1

C1 C1 C1

B1 B1 B1

B1 B1

B1 B1 B1

A

12

34

B C D

B1

B1B

1

B1

B1B

1

B1

B1B

1

B1B

1

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Elevation At Grid Lines 2, 3, 4, A, B and C

C1

B1 B1 B1

12'

12'

12'

12'

12'

Story 1

Story 2

Story 3

Story 4

Story 5

Base

20'20'20'

B1 B1 B1

B1 B1 B1

B1 B1 B1

B1 B1 B1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

Elevation at Grid Line 1 and D

C1

B1 B1

12'

12'

12'

12'

12'

Story 1

Story 2

Story 3

Story 4

Story 5

Base

20'20'

B1 B1

B1 B1

B1 B1

B1 B1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

C1

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Modeling, Dynamic Analysis of RC Building Step-by-Step Solution

1. Start Model from Template Only one floor frame will be created by template and will be copied to the remaining floors after started floor has been modified already.

Step 1-1: Start SAP2000 by clicking on the appropriate desktop shortcut or by selecting sAP2000 from your Windows Start menu. Select “Kip-in” from drop-down menu box in bot-tom-right screen. Go to File > New Model from Template and select space frame template as shown in above figure.

Step 1-2: Specify parameter as shown in above figure and click “OK”.

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Step 1-3: After clicking OK, SAP2000 creates space frame based on the parame-ters specified in the previous step and displays in “Plan View” and “3-D View” win-dow.

Step 1-4: Save the project by clicking on or File > Save from main menu, enter File name = "SAP2000_ex06" and click Save.

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2. Define Material Properties Default concrete material (“CONC”) has been used for this example.

Step 2-1: Go to Define > Material Properties in main menu. Select CONC and click on Modify/Show Material to view/revise the material properties.

Step 2-2: Accept the default properties by clicking Cancel or OK 2 times

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3. Define Frame Sections 2 concrete frame sections (“B1” for rectangular beams and “C1” for cir-cle columns) need to be defined for this example. Check the dimen-sions at Problem Statement part at the beginning of the example.

Step 3-1: Go to Define > Frame Sections in main menu to start frame section definition properties editor. Select “Add Rectangular” from second drop-down menu to add rectangular beam.

Step 3-2: Enter “B1” as Section Name as shown in the above figure and accept the other data. Click on Reinforcement to specify reinforcement data.

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Step 3-3: Select Design Type = “Beam” and click OK 2 times to go back to “Define Frame Properties” window.

Step 3-4: The “Define Frame Sections” window shows “B1” section added in the list. Select “Add Circle” from second drop-down menu to add column section.

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Step 3-5: Enter “C1” section properties as shown in above figure, accept other data and click on Reinforcement button to specify reinforcement data.

Step 3-6: In Design Type area select Design Type = “Column”. Clicking OK 2 times to finish this step.

Step 3-7: Define Frame Properties dialogue shows “C1” section in list. Click OK to go back to main screen, which completes the Frame Section Definition steps.

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4. Define Slab Sections

Step 4-1: Go to Define > Shell Sections menu command. Click on “Add New Sec-tion” and enter Section Name and Thickness. Click on “OK”.

Step 4-2: The “Define Shell Sections” window shows “SLAB1” section added in the list. Click on “OK” to end this step.

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5. Define Load Cases

Step 5-1: Go to Define > Static Load Cases. 1 load case named “LOAD1” has been defined as default. Enter Load = “DL” and click “Change Load” to change load case name.

Step 5-2: Define “LL” load case by entering parameter as shown in above figure and clicking “Add New Load”.

Step 5-3: Enter parameter as shown in above figure to add “SUPERDL” load case and click “Add New Load”. Click “OK” to end this step.

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6. Modify Frame

Step 6-1 Delete 2 Beams and 1 Column at Corner: Close “X-Y” View window by clicking on at the top-right of this window. Click on 2 beams and 1 column at the corner as shown in above figure (selection status will display “3 Frames selected” and click on “Delete” at the keyboard.

Step 6-2 Add Shell Sections: Change view to “X-Y” view by clicking on . Select

and click on slab area one by one.

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Step 6-3 Assign Shell Section Property: Click on and draw selection rectangu-lar to cover all model (selection status = “15 Joints, 22 Frames, 8 Shells selected”), click on and select “SLAB1” and click “OK”. “SLAB1” property will be assigned in every slab panel. Click on to return to normal display mode.

Step 6-4 Assign “B1” Frame Section Property: Click on to get previous selec-tion. Click on , select “B1” and click on “OK”.

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Step 6-5 Select all Columns: Change view to “3-D” view by clicking on . In “3-D” View shows all columns are “FSEC1” section property as default from template. Go to Select > Select > Frame Sections, select “FSEC1” and click “Ok”.

Step 6-6 Assign “C1” Section Property: Click on , select “B1” and click on “OK”.

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Step 6-7 Mesh Slab Areas: Click on to select all members in model and go to Edit > Mesh Shells. Enter Mesh into “4” by “4” Shells and click “OK”.

Step 6-8 Divide Frame Elements: Click on to select all members in model and go to Edit > Divide Frames. Select “Break at intersections with selected Frames and Joints” and click “OK”.

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7. Copy Floor 1 to Floor 2-5

Step 7-1: Click on to select all members in model and go to Edit > Replicate. Enter Z = “144”, Number = “4” and click “OK”.

Step 7-2: Click on to remove all section labels

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8. Assign Slab Loads

Step 8-1 Select All Slab Panels: Change working unit to “lb-ft”.

Step 8-2 Assign “LL” load for Slabs: click on to select all members. Click on

, enter parameter as shown above figure and click “OK”. (load value will be posi-tive for downward in “Gravity” direction.

Step 8-3 Assign “LL” load for Slabs: click on to select all members. Click on

, enter parameter as shown above figure and click “OK”. (load value will be posi-tive for downward in “Gravity” direction.

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9. Assign Beam Loads

Step 9-1 Select All Beams: Go to Select > Select > Frame Sections, select “B1” and click “OK”.

Step 9-2 Assign Uniform Beam Loads: Click on , enter parameter as shown in above figure and click “OK”.

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10. Assign Dynamic Loads

Step 10-1: Go to Define > Response Spectrum Cases and click on “Add New Spectra”. Enter parameter as shown in above figure and click “OK” 2 times.

11. Start Analysis

Step 11-1: Start analysis by clicking and wait until analysis status report “ANALYSIS COMPLETE”

Note: Viewing Analysis Results, Carrying Out Design, Viewing Design Results and Printing Input/ Output Procedures are same as Previous Ex-ample