19楼
OVERVIEW OF RECENT DEVELOPMENTS OF U.S. BRIDGE TECHNOLOGIES
BENJAMIN M. TANG, P.E.
Bridge Preservation Engineering Manager, Oregon DOT, Salem Oregon (Present)
Retired Chief Bridge Engineer, U.S. DOT, Federal Highway Administration (1977-2008)
ABSTRACT: The United States of America is being recognized as having the most extensive
transportation networks in the world. With the designation of more than 46,400 miles as the National
Highway System, mobility becomes a right as people travel and freight transport demands continue to rise.
With 600,000 bridges in the national inventory, the average age of a bridge in the United States is 45 years.
This presents a tremendous opportunity to advance research and deploy bridge technologies to enable
more durable and longer lasting bridges, more economical and faster construction techniques and more
reliable and maintainable structures for the renewal of the highway infrastructure. This keynote address
will present an overview of the recent developments in bridge technology infrastructure renewal.
KEYWORDS: Cable suspension, Cable-stayed, HPC, HPS, FRP, and Accelerated Bridge Construction.
1．INTRODUCTION
The United States of America has one of the most extensive transportation networks in the world. With
the designation of more than 46,400 miles as the National Highway System out of a million plus miles of
all roads combined, mobility becomes a right as demand for people travel and freight transport continue to
rise. The growing economy requires it and the social culture depends on it. With 600,000 bridges in the
national inventory with an average age of 45 years old, this presents a tremendous opportunity to advance
research and to deploy bridge technologies for the renewal of the infrastructure in the following:
Improving current bridge materials technology for long span bridges to extend and/or increase
their service life
Developing and deploying high performance structural materials and innovative quality designs
for more durable and reliable structures
Developing and implementing accelerated bridge construction technology in heavily congested
and high volume traffic areas to quickly deliver projects within hours or over a weekend.
The author served as one of the active key leaders involved in the development, implementation and
promotion of numerous bridge technologies in the last decade during his previous employment with the
Federal Highway Administration (FHWA), United States Department of Transportation (DOT). Examples
of the bridge technology topics that are being presented in this overview paper relate to cable suspension
and cable-stayed bridges, high performance materials applications, and accelerated bridge construction
techniques.
2．OVERVIEW OF RECENT DEVELOPMENT OF U.S. BRIDGE TECHNOLOGY
2.1 SUSPENSION CABLE BRIDGE TECHNOLOGY
There was a 30-year gap from 1973 since the Chesapeake Bay Bridge was last built to 2003 when the
Carquinez Bridge was constructed. From a dated inventory of 139 suspension bridges in the United States,
1OVERVIEW OF RECENT DEVELOPMENTS OF U.S. BRIDGE TECHNOLOGIES
BENJAMIN M. TANG, P.E.
Bridge Preservation Engineering Manager, Oregon DOT, Salem Oregon (Present)
Retired Chief Bridge Engineer, U.S. DOT, Federal Highway Administration (1977-2008)
ABSTRACT: The United States of America is being recognized as having the most extensive
transportation networks in the world. With the designation of more than 46,400 miles as the National
Highway System, mobility becomes a right as people travel and freight transport demands continue to rise.
With 600,000 bridges in the national inventory, the average age of a bridge in the United States is 45 years.
This presents a tremendous opportunity to advance research and deploy bridge technologies to enable
more durable and longer lasting bridges, more economical and faster construction techniques and more
reliable and maintainable structures for the renewal of the highway infrastructure. This keynote address
will present an overview of the recent developments in bridge technology infrastructure renewal.
KEYWORDS: Cable suspension, Cable-stayed, HPC, HPS, FRP, and Accelerated Bridge Construction.
1．INTRODUCTION
The United States of America has one of the most extensive transportation networks in the world. With
the designation of more than 46,400 miles as the National Highway System out of a million plus miles of
all roads combined, mobility becomes a right as demand for people travel and freight transport continue to
rise. The growing economy requires it and the social culture depends on it. With 600,000 bridges in the
national inventory with an average age of 45 years old, this presents a tremendous opportunity to advance
research and to deploy bridge technologies for the renewal of the infrastructure in the following:
Improving current bridge materials technology for long span bridges to extend and/or increase
their service life
Developing and deploying high performance structural materials and innovative quality designs
for more durable and reliable structures
Developing and implementing accelerated bridge construction technology in heavily congested
and high volume traffic areas to quickly deliver projects within hours or over a weekend.
The author served as one of the active key leaders involved in the development, implementation and
promotion of numerous bridge technologies in the last decade during his previous employment with the
Federal Highway Administration (FHWA), United States Department of Transportation (DOT). Examples
of the bridge technology topics that are being presented in this overview paper relate to cable suspension
and cable-stayed bridges, high performance materials applications, and accelerated bridge construction
techniques.
2．OVERVIEW OF RECENT DEVELOPMENT OF U.S. BRIDGE TECHNOLOGY
2.1 SUSPENSION CABLE BRIDGE TECHNOLOGY
There was a 30-year gap from 1973 since the Chesapeake Bay Bridge was last built to 2003 when the
Carquinez Bridge was constructed. From a dated inventory of 139 suspension bridges in the United States,
1OVERVIEW OF RECENT DEVELOPMENTS OF U.S. BRIDGE TECHNOLOGIES
BENJAMIN M. TANG, P.E.
Bridge Preservation Engineering Manager, Oregon DOT, Salem Oregon (Present)
Retired Chief Bridge Engineer, U.S. DOT, Federal Highway Administration (1977-2008)
ABSTRACT: The United States of America is being recognized as having the most extensive
transportation networks in the world. With the designation of more than 46,400 miles as the National
Highway System, mobility becomes a right as people travel and freight transport demands continue to rise.
With 600,000 bridges in the national inventory, the average age of a bridge in the United States is 45 years.
This presents a tremendous opportunity to advance research and deploy bridge technologies to enable
more durable and longer lasting bridges, more economical and faster construction techniques and more
reliable and maintainable structures for the renewal of the highway infrastructure. This keynote address
will present an overview of the recent developments in bridge technology infrastructure renewal.
KEYWORDS: Cable suspension, Cable-stayed, HPC, HPS, FRP, and Accelerated Bridge Construction.
1．INTRODUCTION
The United States of America has one of the most extensive transportation networks in the world. With
the designation of more than 46,400 miles as the National Highway System out of a million plus miles of
all roads combined, mobility becomes a right as demand for people travel and freight transport continue to
rise. The growing economy requires it and the social culture depends on it. With 600,000 bridges in the
national inventory with an average age of 45 years old, this presents a tremendous opportunity to advance
research and to deploy bridge technologies for the renewal of the infrastructure in the following:
Improving current bridge materials technology for long span bridges to extend and/or increase
their service life
Developing and deploying high performance structural materials and innovative quality designs
for more durable and reliable structures
Developing and implementing accelerated bridge construction technology in heavily congested
and high volume traffic areas to quickly deliver projects within hours or over a weekend.
The author served as one of the active key leaders involved in the development, implementation and
promotion of numerous bridge technologies in the last decade during his previous employment with the
Federal Highway Administration (FHWA), United States Department of Transportation (DOT). Examples
of the bridge technology topics that are being presented in this overview paper relate to cable suspension
and cable-stayed bridges, high performance materials applications, and accelerated bridge construction
techniques.
2．OVERVIEW OF RECENT DEVELOPMENT OF U.S. BRIDGE TECHNOLOGY
2.1 SUSPENSION CABLE BRIDGE TECHNOLOGY
There was a 30-year gap from 1973 since the Chesapeake Bay Bridge was last built to 2003 when the
Carquinez Bridge was constructed. From a dated inventory of 139 suspension bridges in the United States,
1OVERVIEW OF RECENT DEVELOPMENTS OF U.S. BRIDGE TECHNOLOGIES
BENJAMIN M. TANG, P.E.
Bridge Preservation Engineering Manager, Oregon DOT, Salem Oregon (Present)
Retired Chief Bridge Engineer, U.S. DOT, Federal Highway Administration (1977-2008)
ABSTRACT: The United States of America is being recognized as having the most extensive
transportation networks in the world. With the designation of more than 46,400 miles as the National
Highway System, mobility becomes a right as people travel and freight transport demands continue to rise.
With 600,000 bridges in the national inventory, the average age of a bridge in the United States is 45 years.
This presents a tremendous opportunity to advance research and deploy bridge technologies to enable
more durable and longer lasting bridges, more economical and faster construction techniques and more
reliable and maintainable structures for the renewal of the highway infrastructure. This keynote address
will present an overview of the recent developments in bridge technology infrastructure renewal.
KEYWORDS: Cable suspension, Cable-stayed, HPC, HPS, FRP, and Accelerated Bridge Construction.
1．INTRODUCTION
The United States of America has one of the most extensive transportation networks in the world. With
the designation of more than 46,400 miles as the National Highway System out of a million plus miles of
all roads combined, mobility becomes a right as demand for people travel and freight transport continue to
rise. The growing economy requires it and the social culture depends on it. With 600,000 bridges in the
national inventory with an average age of 45 years old, this presents a tremendous opportunity to advance
research and to deploy bridge technologies for the renewal of the infrastructure in the following:
Improving current bridge materials technology for long span bridges to extend and/or increase
their service life
Developing and deploying high performance structural materials and innovative quality designs
for more durable and reliable structures
Developing and implementing accelerated bridge construction technology in heavily congested
and high volume traffic areas to quickly deliver projects within hours or over a weekend.
The author served as one of the active key leaders involved in the development, implementation and
promotion of numerous bridge technologies in the last decade during his previous employment with the
Federal Highway Administration (FHWA), United States Department of Transportation (DOT). Examples
of the bridge technology topics that are being presented in this overview paper relate to cable suspension
and cable-stayed bridges, high performance materials applications, and accelerated bridge construction
techniques.
2．OVERVIEW OF RECENT DEVELOPMENT OF U.S. BRIDGE TECHNOLOGY
2.1 SUSPENSION CABLE BRIDGE TECHNOLOGY
There was a 30-year gap from 1973 since the Chesapeake Bay Bridge was last built to 2003 when the
Carquinez Bridge was constructed. From a dated inventory of 139 suspension bridges in the United States,
1
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