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7/29/2019 S4_LADOTD Bridge Design Manual Update_LTC2013
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LADOTD Bridge Design and
Evaluation Manual (BDEM)Development Update
Zhengzheng Jenny Fu, P.E.
Assistant Bridge Design AdministratorLADOTD
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Outline
Organization of BDEM
Status
Schedule
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Organization of BDEM
Part I Policies and Procedures
Part II Design Specifications (Supplement
AASHTO Specifications)Volume 1 - Bridge Design
Volume 2 - Movable Bridge Design
Volume 3 - Structural Supports for PermanentHighway Signs and High Mast Lighting
Volume 4 - Highway Safety
Volume 5 - Bridge Evaluation/Rating
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Status
Major policies have been issued through BridgeDesign Technical Memoranda (BDTMs)
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Status - Part I(Policies and Procedures)
BDTM.37 Bridge Design Section Policy onQC/QA
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QC/QA Background
8/1/ 2007 Collapse of I-35W Bridge in MN
11/14/2008 NTSB Findings
Failure of the Gusset Plates at U10 Node Design/Plan Error
Insufficient QC/QA Procedures (Bridge Design Firm,
FHWA, and State)NTSB made recommendations to FHWA/AASHTO toestablish a bridge design QC/QA program to be used by theStates and other bridge owners
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QC/QA Background
7/17/2009 NCHRP 20-86/US Domestic Scan 09-01Best Practices In Quality Control and Quality Assurance inDesign (final report published on 7/2011)
8/2011 FHWA/AASHTO Guidance on QC/QA in BridgeDesign in Response to NTSB Recommendations
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QC/QA Background
9/26/2011 FHWA Memo Requested States toImplement the Guidance
Step 1:Evaluate existing QC/QA Program for Consultant
Projects and In-House Projects
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QC/QA Background
2%
2%
23%
30%
23%
30%
47%
47%4%
4%
National Survey from NCHRP 20-86 for Consultant Projects
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QC/QA Background
Step 2: Develop a Bridge Design QC/QA Policy for FHWAsApproval
Step 3: Publish the QC/QA Policy and Provide Training to
Consultants and In-House Staff
Step 4: Monitor the Implementation and Perform Audit
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QC/QA Policy Overview
10/30/2012 LADOTD published Bridge Design SectionQC/QA Policy (BDTM.37)
Consultant/Design-Build Projects
In-House Projects/Standards/Software
All Design Activities in design stage and construction
support stage
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QC/QA Policy Overview
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QC/QA Policy Overview
QC/QA Definitions in Bridge Design
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QC/QA Policy Overview
Quality People
Effective QC/QA Process and Checklists
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Designer/Detailer
Checker
Reviewer
QC/QA Policy Overview
QC
QA
EOR Seals Calculations and Plans
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QC/QA Policy Overview
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QC/QA Policy Overview
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QC/QA Policy Overview
Consultant/Design-Build Projects
Effective 11/1/2012 a new QC/QA Statement is included in theadvertisement and contract for all bridge design projects
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QC/QA Policy Overview
Responsibilities of LADOTD Bridge Task Managerfor a Consultant/Design-Build Project
Prepare Scope of Work/Man-Hour Estimate/Min.Personnel Requirement/Project EvaluationCriteria/Review Advertisement
Evaluate SF24-102 and QC/QA Plan Document
Initiate a Bridge Design Kick-Off Meeting to Meet KeyDesign Team Members and Discuss Project Expectations
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QC/QA Policy Overview
Responsibilities of LADOTD Bridge Task Managerfor a Consultant/Design-Build Project
Review and Approve Project Design Criteria
Cursory Review (Not QC/QA) of Project Submittals andMonitor the Implementation of QC/QA Document
Perform Consultant Rating for All Major ProjectSubmittals
Archive Bridge Design Files
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Status - Part II(Design Specifications)
Volume 1 - Bridge Design (75%)
Volume 2 - Movable Bridge Design (90%)
Volume 3 - Structural Supports for PermanentHighway Signs and High Mast Lighting(To be started)
Volume 4 - Highway Safety (To be started)Volume 5 - Bridge Evaluation/Rating (30%)
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Highlights in Vol. 1
LADV-11 (BDTM.28.1)
LADV-11 = Magnification Factor x HL-93
Louisiana WIM Study and NCHRP 12-83
As-Designed Rating (BDTM.29)
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Highlights in Vol. 1
Louisiana Seismic Design Information Table
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Highlights in Vol. 1
Durability for Concrete Structures
New Structural Concrete Classes with
Permeability/Surface Resistivity Requirements andCuring Requirements
Black Reinforcement with Minimum ConcreteCovers
Control Crack Width with Distribution ofReinforcement (Apply Class 2 exposure factor for structures incoastal zone or exposed to deicing salt.)
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Highlights in Vol. 1
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Highlights in Vol. 1
LG Girders
Link Slab (Provide continuous deck, but eliminatethe girder continuity)
Intermediate Diaphragms Wave parameters for the design of all coastal
bridges (LTRC research project)
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Schedule
Phase I - 7/2013
Part I QC/QA Policy
Part II Vol. 1 - Bridge DesignVol. 2 - Movable Bridge Design
Phase II - Continue Updates
Part I Policies (under development)Part II Vol. 3 5
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