Texas Department of Transportation - Bridge Design Manual.pdf

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Bridge Design Manual
December 2001
© by Texas Department of Transportation
(512) 416-2055 all rights reserved
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Manual Notice 2001-1
To:
Districts, Divisions and Offices
From:
Steven E. Simmons, P.E.
Deputy Executive Director
Manual:
Bridge Design Manual
Effective Date: December 1, 2001
Purpose
This manual provides policies and guidelines set forth by TxDOT regarding the design of
bridges. It has been developed to help bridge designers working on TxDOT projects.
Instructions
This is a new manual containing new and significantly reorganized material. It supersedes
the 1990 Bridge Design Guide and the 1990 Bridge Design Examples , both first editions.
Contents
The manual contains ten chapters – Organizational Overview, TxDOT and Bridge Design,
Design Specifications, Geometric Restraints, Preliminary Considerations, General Design
Controls, Superstructure Design, Substructure Design, Special Designs, and Foundation
Design. The manual also has four appendices.
Contact
For more information regarding any chapter or section in this manual, please contact the
Design Section of the Bridge Division.
Chapter 1
Organizational Overview
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Chapter 1 — Organizational Overview
Section 1 — This Manual
Section 1
This Manual
Overview
This manual was developed to provide bridge designers working on Texas Department of
Transportation (TxDOT) projects with the policies and guidelines set forth by TxDOT
regarding the design of bridges.
Its purpose is to improve the bridge design and detailing process by promoting uniformity
among bridge designers working on TxDOT projects.
This manual is subject to revision as conditions, experience, or research data warrant.
Changes will be issued by Manual Notice. Changes may be in the form of new sheets to be
added, revised sheets to replace superceded ones, or sheets to be deleted.
The manual is not intended to be a complete substitute for engineering experience,
knowledge, or judgment. Special situations may arise that appear to call for variation from
the policy requirements herein. Such variation will be subject to approval of the
administration of the TxDOT Bridge Division.
Direct any questions or comments on the content of the manual to the Director of the Design
Section of the Bridge Division, Texas Department of Transportation.
Bridge Design Manual Format
The manual begins with this overview of the manual and a description of the evolution of
the TxDOT Bridge Division. The chapters that follow include information on TxDOT
Divisions/Sections, design specifications, geometric restraints, preliminary considerations,
general design controls, superstructure design, substructure design, special designs, and
foundation design. The following paragraphs briefly discuss these chapters:
Chapter 2 presents a description of the TxDOT Divisions/Sections primarily involved in
bridge design, planning, construction, and maintenance and provides descriptions of the
responsibilities of the TxDOT Bridge Division’s Bridge Design Section.
Chapter 3 lists and briefly describes the governing design specifications, or “Rule Books,”
involved in bridge design. The chapter includes information on mandatory specifications,
guide specifications, and industry recommendations.
Chapter 4 discusses the common roadway geometric restraints inherent in bridge design.
Bridge widths, span lengths, clearances, and alignment are discussed. A section on the
constraints involved during stage construction is also included.
Chapter 5 presents some common aspects a designer/planner must consider during the
preliminary planning and design process. These aspects include materials, structure type,
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Chapter 1 — Organizational Overview
Section 1 — This Manual
economics, and aesthetics. A discussion on bridge railing and use of corrosion protection is
also included.
Chapter 6 discusses in greater detail some of the more common design specifications
involved during the design of a bridge, giving the designer additional information on the
application and usage of common design specifications and criteria.
Chapter 7 presents design criteria and design guidance for the most commonly used
superstructure types, including cast-in-place, precast, and steel superstructures. Background
information on the development of each superstructure type is also included.
Chapter 8 presents design criteria and design guidance for the most commonly used
substructure items, including caps, columns, and foundations. Background information on
the development of some of these items is also included.
Chapter 9 presents design criteria and design guidance for designs that inherently involve
unique aspects, culverts and drainage, bridge appurtenances, sign bridges, and some
common bridge items. Background information on the development of some of these
designs is also included.
Chapter 10 discusses in greater detail the relationship between structural design and
geotechnical design. Some guidance on bridge foundation designs and retaining wall
designs is included, as well as background information on the development of some of these
items.
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