NCHRP 20-07 Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for ...

57 Pages·2015·3.3 MB·English

by  Parsons Brinckerhoff

NCHRP 20-07
Review of the AASHTO LRFD Movable Highway Bridge
Design Specifications for future updates
AASHTO SCOBS Annual Meeting
T-8 Technical Subcommittee for Movable Bridges
April 20, 2015
Saratoga Springs, NY

NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
NCHRP 20-07
Review of the AASHTO LRFD Movable Highway Bridge
Design Specifications for future updates
DISCLAIMER: This investigation is sponsored by TRB under the
NCHRP Program. Data reported is work in progress. The contents of
this presentation has not been reviewed by the project panel or
NCHRP, nor do they constitute a standard, specification, or
regulation.

NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
Presentation Outline
• Research Objectives
• Research Approach
• Update of Current Status
• Reliability-based design
• Proposed Revisions to
AASTHO Specifications
• Open Discussion
NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
Research Objective
The current specifications need updating to incorporate the LRFD
method, based on reliability-based design methodology and to
reflect advances in mechanical systems, electrical drives and controls,
and traffic/marine safety systems. The objectives of this research are to:

• Develop a stand-alone synthesis of the various types of mechanical
systems and electrical controls and drives currently being used in
movable bridges

• Identify the areas of the AASHTO LRFD Movable Bridge Design
Specifications that require modification, addition, or deletion to
incorporate the LRFD method to reflect advances in structural
materials and design, mechanical systems, electrical drives and
controls, and traffic/marine safety systems

• Propose recommendations for future research needs

NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
Research Approach
WE ARE HERE
NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
The Research Team
LEGEND
Parsons Brinckerhoff (*)
Barton Newton, P.E.
Steward Machine Company (SMC)
James A. Swanson (JS)
John Kirchner (JK)
HBM Engineering (HBM)
Washington State DOT (WSDOT) –
Florida DOT (FDOT) –
Invited, formal acceptance pending
NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
Task 1 – Literature Review
Current Applicable Design Standards - USA

• AASHTO LRFD Bridge Design Specifications, Customary
U.S. Units, 7th Edition, 2014
Reliability-Based for Structural
• AASHTO LRFD Movable Highway Bridge Design
Specifications (Specifications), 2nd Edition, 2007, with
yearly Interim Revisions through 2012 –
Not Reliability-Based for Mechanical and Electrical
NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
Task 1 – Literature Review
Other relevant Movable Bridge Design Standards

• CAN/CSA-S6-06, Canadian Highway Bridge Design
Code, Chapter 13 – Movable Bridges, Published 2006,
Reliability-Based for Structures
Not Reliability-Based for Mechanical and Electrical
• AREMA Manual for Railway Engineering, Volume 2 -
Structures, Chapter 15 - Steel Structures, Part 6,
Not Reliability-Based
NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
Task 2 – Synthesize the Various Types of
1) Mechanical Systems and 2) Electrical Drives and Controls
Movement Characteristics
AASHTO Movable Bridge Types Associated Sub-Type Names
Per Birnstiel
-Rotation about a fixed transverse horizontal axis Trunnion Bascule, Rolling-Lift Bascule,
(tunnion bascule) Scherzer, Strauss, Under-deck counterweight,
Heel Trunnion with Vertical Overhead
Bascule Bridges
-Rotation about a transverse horizontal axis that Counterweight, Heel Trunnion with Swinging
simultaneously translates longitudinally (rolling Counterweight, ABT, Belidore, Balance Beam,
bascule) Ferry Transfer Span
Swing, Bob Tail Swing, Center Bearing, Rim
Swing Bridges -Rotation about a fixed vertical axis Bearing, Combined Bearing, Slewing Bearing,
Pontoon-Supported
Vertical Lift, Span Drive, Tower Drive,
Vertical Lift Bridges -Translation along a fixed vertical axis Connected Tower Drive, Tower-less Pit Drive,
Lifting Deck, Tower Hoist Drive
-Translation along a fixed horizontal axis
(retractile and transporter)
-Rotation about a fixed longitudinal axis Retractile, Floating-Pontoon Retractile,
Other/Specialty/Uncommon
(gyratory) Transporter, Gyratory, Folding
-Rotation about multiple transverse horizontal
axis (folding)
NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates
Task 2 – Synthesize the Various Types of
1) Mechanical Systems and 2) Electrical Drives and Controls
Functional Systems of Movable Bridges
• Support • Interlocking
• Balance • Navigational Guidance
• Drive • Traffic Control
• Control
Per Sect ion 2.2.1 of the AASHTO Movable Bridge Inspection, Evaluation and Maintenance Manual, 1998
Coordinate with:
• Proposed Bridge Management Element Definitions for
Movable Bridges under NCHRP Project 14-32/07
NCHRP 20-07/348, Review of the AASHTO LRFD Movable Highway Bridge Design Specifications for Future Updates