s4_ladotd bridge design manual update_ltc2013

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 Definitions in Bridge Design


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Quality People

Effective QC/QA Process and Checklists


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Designer/Detailer

Checker

Reviewer


QC

QA

EOR Seals Calculations and Plans


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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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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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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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Louisiana Seismic Design Information Table


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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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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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