use of bim in post-tension design convention... · revit or exported as dwg. design model exported...

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Use of Building Information Modeling (BIM)

In PT Design

2009 PTI Technical Conference

ADAPT Corporation | Redwood City, CA, USAADAPT International Pvt. Ltd. | Kolkata, India

ADAPT Latin America | Miami, USA

www.adaptsoft.comMay 2009

© Copyright 2009 ADAPT Corporation all rights reserved

2009 PTI Technical ConferenceUse of Building Information Modeling (BIM) In PT Design www.adaptsoft.com

© Copyright Post-Tensioning Institute all rights reserved. of 22

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Abstract

Use of BIM In PT Design

This presentation reviews the latest technology and best practices available for the streamlined design of Post-Tensioned floor and foundation systems using Building Information Modeling (BIM). The BIM-based design process presented is based on the use of intelligent objects to model, analyze, design, and document a PT project without having to re-create project information at each step, saving time and reducing errors. Design and documentation steps reviewed will include the modeling of concrete outline, layout of tendons, tendon optimization, comprehensive code checks, calculation of required reinforcement, and the automated creation of structural drawings and post-tensioning shop drawings.

The presentation concludes with comments on the missing link for seamless design process from a building’s 3D model to construction drawings, and ADAPT’s solution in providing the link.



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Unlike Traditional Design Approaches,a BIM-based Approach Offers The Following Advantages:

• Design Information Represented as Intelligent Model-based Objects• Structural Concrete Components• Load Path• Post-Tensioning Tendons• Reinforcement …

• Software Can Use This Information to Automate Tasks• Creation of Design Strips and Sections• Tendon Optimization• Calculation of Reinforcement• Creation of PT Shop Drawings …

• Design Information Can Be Exchanged Between Software

Why BIM?

Building Information Modeling



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Why BIM?

Building Information Modeling

• Save Time

• Reduce Errors

• Produce Better Coordinated Designs



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Design of Post-Tensioned Slabs Using Traditional EFM Approach

Traditional PT Design Process

PT Placement Plan

Reinforcement Plan

Framing Plan …

Strip Models Design Report for Each Strip

Linear Design Process Requiring Manual Data Interpretation and Re-Entry at Each Step



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Design of Post-Tensioned Slabs Using Conventional FEM Approach

Conventional FEM Approach

PT Placement Plan

Reinforcement Plan

Framing Plan

Finite ElementModel

Rebar DesignDesign of Design Strips

Annotated PT Layout

Improved Process. Depending on Software, Some Steps Still Require Manual Data Re-entry.



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Design of Post-Tensioned Slabs Using Fully Integrated BIM Approach

BIM-Based Approach

Revit Structure ModelStructural Drawings Created in

Revit or Exported as DWG

Design Model Exported from Revit

Automatically Generated Design Strips and Sections

Fully Editable BIM-Based Reinforcement

3D Tendon ModelsDesign Changes Propagate Through

Design Process



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Project Information Modeled in Revit

Revit Structure Can Be Used to Model Project Information

Project Example Courtesy of SCA

• Structural Components• Material Properties• Loads• Load Cases• Load Combinations



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Structural Information Used for Design

Relevant Structural Information Can be Exported to ADAPT(ADAPT Uses Physical Model in Revit)



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Detailed Analysis & Design

Information From Revit Used to Drive Analysis & Design

Organic Automatic FEM Mesh

Automatically Generated Design Strips

Automatically Generated Design

Sections



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Tendon Layout in Slab

3D Tendon Profiles are Modeled in Slab



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Automated Tendon Layout Tools

Software Can Optimize Tendon Profile & Force(Based on P/A, % SW to Balance, and Max Spacing Requirements)



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Integrated Constructability Checks

Automatically Check Your Tendon Layout

Automatic Tendon Clash Checking

Automatic Checking of Min Allowable Curvature



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Dynamic Rebar Design

Software Calculates All Required Reinforcement



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Standardize & Optimize Rebar Layout

BIM-Based Rebar Is Fully Editable

Modify:

• # of Bars• Bar Size• Length• Distribution• Spacing• Annotation• Cover



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Automatically Produce Rebar Plans

Reinforcement Information in Design Software Is Exported To Become Basis of Reinforcement Plans

Reinforcement Placement In Design

Software

Reinforcement Plan in Revit Structure or AutoCAD



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Automatically Produce PT Plans

PT Model Information Is Used to Generate PT Plans

PT Design Information In Design Software

Cleaned Up PT Placement Plan in Revit Structure or AutoCAD



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Information For PT Shop Drawings

Software Can Generate PT Shop Drawings



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Missing Link for Seamless BIM

Physical models are used in BIM modeling and constructionAnalytical models are used by Structural Engineers

Geometry of construction is used for the Physical Models. In real construction centroids of members are rarely concurrent for force transfer in Analytical Models



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Missing Link in Seamless BIM

The discrepancy between the physical and Analytical models has been until now the primary obstacle to seamless integration of design process

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(a) Physical Model

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Physical(b) Analytical over

COLUMN

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TIES H hH

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Physical & Analytical(e) Unification of



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Structural Requirements of BIM & PT

Tendons can no longer be represented by the traditional methods based on equivalent forces. Each tendon crossing each finite element cell has to be represented as a physical entity.

Traditional representation of a tendon by equivalent forces Representation of tendon as a discrete

piece of steel through a finite element cell

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INFLECTIONTENDON

W1

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X1

W2

POINT

Y2

W4

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SEGMENT

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i

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TENDON



PT Model Information Is Used to Generate PT PlansPT Design Information

In Design SoftwareCleaned Up PT Placement Plan in

Revit Structure or AutoCAD

Thank you for your attention

(California State Flower)



use of bim in post-tension design convention... · revit or exported as dwg. design model exported...

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