LADOTD Bridge Design and Evaluation Manual (BDEM) Development Update. Zhengzheng Jenny Fu, P.E. Assistant Bridge Design Administrator LADOTD

Transcription

1 LADOTD Bridge Design and Evaluation Manual (BDEM) Development Update Zhengzheng Jenny Fu, P.E. Assistant Bridge Design Administrator LADOTD

2 Outline Organization of BDEM Status Schedule

3 Organization of BDEM Part I Part II Policies and Procedures Design Specifications (Supplement AASHTO Specifications) Volume 1 - Bridge Design Volume 2 - Movable Bridge Design Volume 3 - Structural Supports for Permanent Highway Signs and High Mast Lighting Volume 4 - Highway Safety Volume 5 - Bridge Evaluation/Rating

4 Status Major policies have been issued through Bridge Design Technical Memoranda (BDTMs)

5 Status - Part I (Policies and Procedures) BDTM.37 Bridge Design Section Policy on QC/QA

6 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 to establish a bridge design QC/QA program to be used by the States and other bridge owners

7 QC/QA Background 7/17/2009 NCHRP 20-86/US Domestic Scan Best Practices In Quality Control and Quality Assurance in Design (final report published on 7/2011) 8/2011 FHWA/AASHTO Guidance on QC/QA in Bridge Design in Response to NTSB Recommendations

8 QC/QA Background 9/26/2011 FHWA Memo Requested States to Implement the Guidance Step 1: Evaluate existing QC/QA Program for Consultant Projects and In-House Projects

9 QC/QA Background 2% 23% 4% 47% 2% 47% 30% 23% 4% 30% National Survey from NCHRP for Consultant Projects

10 QC/QA Background Step 2: Develop a Bridge Design QC/QA Policy for FHWA s Approval Step 3: Publish the QC/QA Policy and Provide Training to Consultants and In-House Staff Step 4: Monitor the Implementation and Perform Audit

11 QC/QA Policy Overview 10/30/2012 LADOTD published Bridge Design Section QC/QA Policy (BDTM.37) Consultant/Design-Build Projects In-House Projects/Standards/Software All Design Activities in design stage and construction support stage

12 QC/QA Policy Overview

13 QC/QA Policy Overview QC/QA Definitions in Bridge Design

14 QC/QA Policy Overview Quality People Effective QC/QA Process and Checklists

15 QC/QA Policy Overview Designer/Detailer Checker Reviewer QC QA EOR Seals Calculations and Plans

16 QC/QA Policy Overview

17 QC/QA Policy Overview

18 QC/QA Policy Overview Consultant/Design-Build Projects Effective 11/1/2012 a new QC/QA Statement is included in the advertisement and contract for all bridge design projects

19 QC/QA Policy Overview Responsibilities of LADOTD Bridge Task Manager for a Consultant/Design-Build Project Prepare Scope of Work/Man-Hour Estimate/Min. Personnel Requirement/Project Evaluation Criteria/Review Advertisement Evaluate SF and QC/QA Plan Document Initiate a Bridge Design Kick-Off Meeting to Meet Key Design Team Members and Discuss Project Expectations

20 QC/QA Policy Overview Responsibilities of LADOTD Bridge Task Manager for a Consultant/Design-Build Project Review and Approve Project Design Criteria Cursory Review (Not QC/QA) of Project Submittals and Monitor the Implementation of QC/QA Document Perform Consultant Rating for All Major Project Submittals Archive Bridge Design Files

21 Status - Part II (Design Specifications) Volume 1 - Bridge Design (75%) Volume 2 - Movable Bridge Design (90%) Volume 3 - Structural Supports for Permanent Highway Signs and High Mast Lighting (To be started) Volume 4 - Highway Safety (To be started) Volume 5 - Bridge Evaluation/Rating (30%)

22 Highlights in Vol. 1 LADV-11 (BDTM.28.1) LADV-11 = Magnification Factor x HL-93 Louisiana WIM Study and NCHRP As-Designed Rating (BDTM.29)

23 Highlights in Vol. 1 Louisiana Seismic Design Information Table

24 Highlights in Vol. 1 Durability for Concrete Structures New Structural Concrete Classes with Permeability/Surface Resistivity Requirements and Curing Requirements Black Reinforcement with Minimum Concrete Covers Control Crack Width with Distribution of Reinforcement (Apply Class 2 exposure factor for structures in coastal zone or exposed to deicing salt.)

25 Highlights in Vol. 1

26 Highlights in Vol. 1 LG Girders Link Slab (Provide continuous deck, but eliminate the girder continuity) Intermediate Diaphragms Wave parameters for the design of all coastal bridges (LTRC research project)

27 Schedule Phase I - 7/2013 Part I QC/QA Policy Part II Vol. 1 - Bridge Design Vol. 2 - Movable Bridge Design Phase II - Continue Updates Part I Policies (under development) Part II Vol. 3 5

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