LADOTD Bridge Design and Evaluation Manual (BDEM)

Development Update

Zhengzheng “Jenny” Fu, P.E.

Assistant Bridge Design Administrator LADOTD

Outline Organization of BDEM

Status

Schedule

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 Permanent Highway Signs and High Mast Lighting

Volume 4 - Highway Safety

Volume 5 - Bridge Evaluation/Rating

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

Status - Part I (Policies and Procedures)

BDTM.37 Bridge Design Section Policy on

QC/QA

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

QC/QA Background 7/17/2009 NCHRP 20-86/US Domestic Scan 09-01

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

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

QC/QA Background

2%

2%

23%

30%

23%

30% 47%

47% 4%

4%

National Survey from NCHRP 20-86 for Consultant Projects

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

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

QC/QA Policy Overview

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

QC/QA Policy Overview Quality People

Effective QC/QA Process and Checklists

Designer/Detailer

Checker

Reviewer

QC/QA Policy Overview

QC

QA

EOR Seals Calculations and Plans

QC/QA Policy Overview

QC/QA Policy Overview

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

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 SF24-102 and QC/QA Plan Document

Initiate a Bridge Design Kick-Off Meeting to Meet Key Design Team Members and Discuss Project Expectations

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

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%)

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)

Highlights in Vol. 1

Louisiana Seismic Design Information Table

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.)

Highlights in Vol. 1

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)

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