expeditious design approach strip method · pdf filepost-tensioned slab design using...
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1 © Copyright 2013 ADAPT Corporation all rights reserved
Expeditious Design of Post-Tensioned Floors and Beams Using Strip Method
Simple Frame and Equivalent Frame Approaches
- Featuring -
ADAPT-PT®
ADAPT Corporation | Redwood City, CA, USA
ADAPT Latin America | Miami, FL, USA
ADAPT International Pvt. Ltd. | Kolkata, India
ADAPT Europe | Perugia, Italy
Dr. Florian Aalami
www.adaptsoft.comApril 2013
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Agenda
• Applicable Project Types
• Review of Design Process
• When to use 2D Strip Approach
• Design Example using ADAPT-PT
Post-Tensioned Slab Design using Equivalent Frame Method
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Complete Solution for Slabs & Beams
Column supported two-way flat slab systems
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One-way beam and slab design
Complete Solution for Slabs & Beams
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Beam frames and grids
Complete Solution for Slabs & Beams
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Review of Design Approach
X
Y
COLUMN
SLAB
OPENING
SLABEDGE
BEAM
Typical layout ofcolumn supportedfloor system
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Review of Design Approach
1st Step:Determinesupport lines
F
E
Y
X G
A
D
C
B
Support line
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Review of Design Approach
2nd Step:Determinetributaries and create“design strips”
X
Y
G
F
E
D
C
B
A
31 2 4 5
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Review of Design Approach
3rd Step:Determinedesign sections
Sections forstrips B & Eshown
XY
F
E
D
C
B
A
DESIGNSECTION
31 2 4 5
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Review of Design Approach
4th Step:Design eachsection to provideadequate capacityand meet codecompliance
XY
F
E
D
C
B
A
DESIGNSECTION
31 2 4 5
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Review of Design Approach
5th Step:Design other direction of slab
XY
1 2 3 4 5
F
E
D
C
B
A
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Key Advantages of 2D Strip Method
• Easy to learn and use
• Quickly produces preliminary designs
• Produces optimized PT designs for each strip
• Great learning tool if new to post-tensioning
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B
B
(c) IDEALIZED TRIBUTARY FOR DESIGN
(b) STRAIGHTENED DESIGN STRIP
(a) DESIGN STRIP IN PROTOTYPE
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B
10
1
9 10
2 3
ACTUAL
IDEALIZED
10.510.6 0.8
4
10 9.2
50.8
1 2 3 4 5
If using ADAPT-PT, develop and model idealized design strips
Strip Method Approach to Design
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Traditional Design of 1-Way Systems
The parking structure is broken down into typical beam and one-way slab frames. A beam frame can span several parking modules.
One
-way
sla
b fr
ame
Beam frame
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Traditional Design of 1-Way Systems
Start ADAPT-PT modeling process by selecting appropriate structural system.
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Traditional Design of 1-Way Systems
Use geometry table to easily model your design frame.
Design strip for a beam spanning 2 parking modules
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Traditional Design of 1-Way Systems
Each design strip is designed to meet strength and service requirements of the code.
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Traditional Design of 1-Way Systems
Amount of post-tensioning and profile are determined as well as any additionally required flexural and shear reinforcement.
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PT Integration with Modeler
Import Geometry & Loading from Existing Models
•Revit® Structure•AutoCAD®
•ETABS
Leverage existing project information to save time modeling
Import
Intelligent Revit Structure Models
AutoCAD Information
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Create true 3D slab model
True 3D Model of Slab System or Entire Structure in ADAPT
Model Floor System in Modeler
Model Import
ADAPT-Modeler
True 3DConcreteModeling
Environment
Geometry& LoadingModels
•Revit® Structure•AutoCAD®
•ETABS®
ADAPT-Modeler
True 3DConcreteModeling
Environment
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Generate design strips in Modeler
Generate Design Strips
Define Design StripsImport Model
ADAPT-Modeler
True 3DConcreteModeling
Environment
Geometry& LoadingModels
•Revit® Structure•AutoCAD®
•Robot•ETABS®
ADAPT-Modeler
Define Design Strips
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Carry out detailed analysis and design of strip in ADAPT-PT
Design Strips in PT
Define Design StripsImport Model
ADAPT-Modeler
True 3DConcreteModeling
Environment
Geometry& LoadingModels
•Revit® Structure•AutoCAD®
•Robot•ETABS®
ADAPT-Modeler
Define Design Strips
Export Strips to PT
ADAPT-PT
Design Strips in PT
All geometry and loading information is transferred
to PT
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