4D Modeling: Applications and Benefits - Virtual · PDF file4D Modeling: Applications and...

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4D Modeling:Applications and Benefits

Martin FischerAssoc. Prof., Stanford University

Director, CIFEFounder, Common Point Technologies, Inc.

The big idea:Build virtually before building in reality.

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CIFE Overview• Started in 1988

– Vision: build buildings ahead of time in the computer– Civil & Environmental Engineering, Computer Science

• Industry sponsors– Private and public owners– AEC service providers– Software/hardware

• Virtual Design and Construction (VDC) Tools– Building Information Modeling (3D+) since 1988– Organization-Process Modeling since 1989– 4D modeling since 1993– Virtual reality and multi-screen interfaces since 1996– Develop the foundation and prototypes for various modeling,

analysis, simulation, visualization tools and their implementation• Professional education and Stanford classes on VDC

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4D = 3D plus time

Types of 4D models:• Keyframed (no link to a CPM schedule)• 3D model linked to CPM schedule• 3D model linked to database• Object-based• Hierarchical• Parametric

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4D software and service providers

• Common Point• Bentley• Intergraph• Navisworks• CSA• Balfour Technologies• Phasing functionality in 3D Studio, Revit,

ArchiCAD, etc.

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4D Tools: Bentley’s Schedule Simulator

Schedule Simulator 3D CAD model

3D CAD components

4D simulation

Scheduleactivities

CPM schedule

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Common Point 4D Interface

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ConstructSim (by Common Point)

Construction Model Review

Construction Model Review

Project Planning &Design

Project Planning &Design Work Package

Sequencing

Work Package Sequencing

Field Execution

Field Execution

Design Review

Design Review

Automated Task Detailing

Automated Task Detailing

model shows pipe spool 33-002019-2/3-5 running through a steel beam

Constructability Analysis

Constructability Analysis

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Modeling, Simulation, and Analysis Tools Enable “Project Design”

0%

100%

Level of InfluenceLevel of Influence

ConceptualDesign

Detailed Design and Execution

Closeout &Learning

Expenditure of Funds Expenditure of Funds

OutcomeKnowledgeProject DesignOutcome

Predictions

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If they could only see it my way ...

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4D models facilitate communication and make face-to-face meetings more productive

CAVE snapshot courtesy of WDI, Glendale, CA, and Mortenson, Minneapolis, MN

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4D models help you …• Confirm your own project plans at the

strategic and tactical level• Optimize and manage risks by involving

other project stakeholders early, often, and as needed

• Capitalize on learning curve effects by practicing the project virtually

• Track and monitor project progress• Respond to changed conditions and

new opportunities

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Paradise Pier: gain strategic insight and improve site logistics planning

“Through 4D modeling we were able to visualize concurrent activities at a macro level.”Project Manager, Owner

4D model snapshot courtesy of WDI, Glendale, CA

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Benefits of 4D models on Paradise Pier Project

• Preconstruction– Stakeholder involvement– More precise specification

• Bidding– Bids back within 2%– Contractors understood scope and challenges within

48 hours, could use rest of time to work on bid• Construction

– Reduced change orders (potential for further reduction)

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Is this a good schedule?

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4D models align work throughout supply chains

“The 4D model clearly revealed issues ordinarily resulting in rework.”

AHU cannot be installed at this time.

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Architectural concrete is too late for curtain wall

4D models identify critical interactions between design and construction sequence

“CPT’s 4D models helpedcreate reliable sequences of work that optimize use of resources.”

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Exploration of different hoisting methods

4D Models help plan construction methods

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4D models helped redesign interior scaffolding to shorten construction schedule

Scaffolds collided in the original plan

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Laydown conflicts with architectural concrete pour

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Early Project Planning: US$250M Wastewater Treatment Plant

Determine overall construction strategyCommunicate strategy to key stakeholders

-> get owner buy in-> pull design, procurement work

Package construction contracts optimallySet the tone for the project from the startEstablish project management framework Win the project

US$5,000, 1 week

4D model snapshot courtesy of Mortenson, Seattle, WA

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Getting the project started right: coordinating with the owner

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But you can’t put a crane there!

4D model courtesy of DPR, Redwood City, CA

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How will we get the concrete back there?


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Where can we make up time without tripping over ourselves?


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Can we operate on patients next to construction?

4D model courtesy of URS, San Francisco, CA

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4D models show actual vs. planned schedules

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Benefits of 4D models

• Better designs and better schedules• Improved schedule and cost predictability• Reduced change orders (90% reduction in some

cases)• Fewer requests for information (RFIs) during

construction (up to 60% reduction observed so far)• Increased productivity and less rework• Improved communication from owner to

subcontractors and suppliers

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Use and implementation issues• Schedule pressures increasing

– 4D coordination and communication is valuable for everybody

• 4D models have a profound effect on the team to recognize where the major project risks will manifest themselves

• Validate thinking of team of real critical path• Begin 4D modeling at time of capital expenditure

authorization• Validate early on that thinking of overall

sequencing is correct

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Use and implementation issues

• 4D models highlight sloppy business practice possible in 2D -> dialog needed is painful but very valuable (e.g., naming convention)

• Design professionals are not used to producing documents that are based on sequence of events

• The better the schedule the easier the 4D model• Schedulers are magicians in organization, but

communication is poor• 4D modeling process is as important as the result• Need a manager and an engineer to point to

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Some misconceptions about 4D models• I need to have a detailed 3D model for 4D modeling

– Don’t have to do everything in 3D to do 4D– 4D modeling is not a 3D initiative, it is a scheduling initiative

• 4D modeling is very time-consuming– RFP model in 1 week but possible in 24 hours, project model in 30-60

days• Learning curve is high

– for scheduler: a couple of weeks to understand relationships between schedule and 3D model and to learn 4D software

– project management: a few days– clients/audience: quick education on what they are looking at

• 3D coordination is good enough– every project comes down to construction sequencing to make the

project feasible or economical

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Assessing the value of 4D models

• If people see a problem and resolve it right away (which can be done with 4D models) people don’t notice the value

• Use of 4D models at strategic level -> difficult to quantify value, can only quantify value at tactical level

• Best solutions come from involvement of facility users, designers, and contractors from the start

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Working together in the CIFE iRoom

Comparison of project scenarios with two 4D models, MS Project schedule, and the CIFE Time Controller

4D models and schedule courtesy of DPR Construction, Inc., Redwood City, CA

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