LRFD Now! Andy Zickler VDOT Structure and Bridge Division Central Office April 10, 2006...

LRFD Now!

Andy ZicklerVDOT Structure and Bridge DivisionCentral OfficeApril 10, [email protected]

Status Update on LRFD Implementation

• General Review of Implementation plan

• Training Plan

• Implementation Dates to Remember

• Review of Frequently Asked Questions

• Information Exchange

LRFD –Implementation Review

LRFD transition is historic– LRFD 1st mandatory change in design

philosophy in bridge design in USA– ASD has been around since 1st AASHO

Specification (1931)– LFD introduced in 1970’s but never

mandatory for design across nation– LRFD mandated by FHWA for new bridge

design beginning October 1, 2007

LRFD –Implementation Review

Prepare!– Prepare for

Training– Prepare for

Design– Prepare for

Construction

Train!– Train for design– Train for

Specifications– Train for

Construction

Implement!– Issue new AASHTO

Documentation– Issue new VDOT

Documentation

DESIGN!!!!Follow UP!

– Provide Lessons Learned

– Check for other support needs

LRFD ImplementationPREPARE!

An LRFD Team has been named to design 2 complete bridges using LRFD

Team Members– Andy Zickler (Contact Person)– Tony Barati– Prasad Nallapaneni– John Schuler– Bryan Silvis


LRFD team will be generating complete design computations on 2 bridges– One continuous steel bridge– One continuous P/S bulb tee Bridge

During the design process, team members will be reviewing all parts of the puzzle that make up the contract drawings and specifications


VDOT contract elements will be reviewed for conformance with LRFD– Review will be 3 parts

• Not impacted

• Review complete with final recommendation for action

• Review incomplete with preliminary assessment for action PLUS recommendation for further review.

LRFD ImplementationTRAIN!

Train for Design– 3 Introductory 1 day training sessions

• Structural Steel – Complete!

• P/S Concrete Design – Complete!

• Foundations – July, 2007

– 3 week long training Sessions (VDOT Only)

• Superstructure Design – Taught by NHI

• Software training – Taught by VDOT personnel

• Substructure and Retaining Structures – Taught by NHI


Train for Specifications– Structure of this training not

determined, because extent of impact has not been determined.

– Minimum will be self study. Changes to specifications will highlighted, and points of contact for questions will be distributed

– Consultants will be advised of any VDOT Guidelines, preferences, etc.


Train for Construction– Structure of this training not determined,

because extent of impact has not been determined.

– New specifications explicitly place responsibility for some items on contractor and outline specific requirements for submittal it is likely that we will see more P.E. stamped submittals for things like erection, deck placement, shipping. Learning what is required will be part of training at some point.

– Consultants, Contractors, VTCA, etc. will be kept abreast of developments

LRFD ImplementationIMPLEMENT!

Issue:– VDOT Modifications to LRFD Spec and/or

Design Guidelines– Sample Problems and Design Aids– Revisions to VDOT Road and Bridge Standard

Specifications (as necessary, if necessary)

– Revised Standards, S&B Standard Drawings (as necessary, if necessary)

LRFD ImplementationDESIGN!!!!

April 2, 2007– Begin “all” designs using LRFD

• Some widenings/rehabs may be excluded.

* Definition of “all” to be determined based on what team finds and LRFD plans may change

LRFD ImplementationFollow Up!

LRFD Team will not be disbanded on April 2, 2007– LRFD Team will continue on for at

least several months maybe until October, 2008

– LRFD team will help evaluate whether follow up class training will be required and will help establish parameters

LRFD Trainingin Detail

3 days of Introductory Training (19.5 contact hours total)

– Structural Steel – Complete!– P/S Concrete – Complete! – Foundations (July 11, July 12)

Classes will be lecture format

Classes will include consultant participants

Classes will only be offered on the dates shown, no repeats.

Classes will be in Richmond

LRFD Trainingin Detail -- Software

Examples to be developed (FIRM)– 3 span straight steel plate girder– 4 span bulb-tee, continuous for LL– Concrete Multi-column pier (Rigid Frame Pier)– Concrete Hammerhead pier– Stub Abutment– Full Height Abutment– Wingwalls

Substructures will include piles and spread footings


Additional Examples (TENTATIVE)– Superstructure

• Rolled beam

• Continuous Conc. Slab

– LAMPAD, Tooth– Substructure

• Integral Abutment

• MSE walls

• Pile Bent


Additional Examples (TENTATIVE)– Others under consideration

• Timber deck

• Timber superstructure

• Timber bents (pier and abutment)

– Suggestions?

LRFD --Dates to Remember

Dates through June, 2006– March, 2006 Two one day seminars for steel

superstructures– April, 2006 Two one day seminars for concrete

super– 5/26 Issue preliminary report on LRFD Impacts

to VDOT Modifications to AASHTO– 6/30 Complete 2 design projects – 6/30 Issue final report on LRFD Impacts to

VDOT Modifications to AASHTO– 6/30 Issue preliminary report on LRFD Impacts

to other VDOT Documents


Dates in July, 2006– Issue LRFD Specs and Interims to engineers

– 7/11 NHI one day seminar for substructure/foundations – Session 1

– 7/12 NHI one day seminar for substructure/foundations – Session 2

– 7/28 Issue final report on LRFD impacts to VDOT documents


Dates in August thru December, 2006– 8/1 Issue preliminary Design Documentation on 2 design

projects

– 8/1-10/1 Release/review VDOT AASHTO Design Guides

– 12/1 release 1st Ed. VDOT AASHTO LRFD Guides

– Determine if additional training is required


Dates in January thru April, 2007– 3/19 Planned LRFD Training complete. Evaluate whether

additional training required. Develop plan if required

– 3/30 Final reports on Standards/Office Practice

– 4/2 Implement LRFD on all new bridge projects


Dates in May, 2007 and BEYOND– 5/25 Final report on VDOT specifications/special

provisions

– Support Software…

– Provide support for implementation hiccups

LRFD --Frequently Asked Questions

• When is VDOT switching to LRFD?• What happens after the LRFD training?• When will I get my VDOT documents modified for

LRFD Spec?• Will I have to design my next bridge in LRFD?• After the VDOT training, then what?

Written Answers will be posted on Structure and Bridge LRFD page

LRFD --Frequently Asked Questions (Con’t)

• Who will answer LRFD questions when we start designing?

• Where can I go to get more information on LRFD?

Written Answers will be posted on Structure and Bridge LRFD page

LRFD –Information Exchange

Keeping you informed – 3 ways– Structure and Bridge Division’s LRFD page at

www.virginiadot.org

– Handouts from training, supplemental documentation• Have you tried it, does the LRFD site meet your needs?

– Emails• Too many?, not enough?, right info?, wrong info?

– VTCA• Updates to Executive Leadership

• Coordination of consultant NHI Courses

http://www.virginiadot.org/default_flash.asp

LRFD –Information Exchange

Getting information to the LRFD Team– Do you know how to get to us?

• Phone (George Clendenin, Julius Volgyi, Andy Zickler)• Email (George Clendenin, Julius Volgyi, Andy Zickler)• Thru VTCA

– Does this work for you?• Do you need a better way?• Do you have a better way?

LRFD –Open Questions

What else do you want to know? – If we don’t know today when do you have to

have an answer?– What did we leave out?

What information do you need to plan for your business?– When do you need it?– What form should it be in?

Anything else?

LRFD Now!

THANKS!

Andy Zickler (804) 371-2776VDOT Structure and Bridge DivisionCentral OfficeApril 10, [email protected]

LRFD Now! Andy Zickler VDOT Structure and Bridge Division Central Office April 10, 2006...

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