Find the most up-to-date version of HB TOC at Engineering 4 May 17th Edition – Adopted and Published by Code: HB . AASHTO LRFD Movable Highway Bridge Design Specifications, 1st Edition-. 5 Jan AASHTO: Standard Specifications for Highway Bridges. 24 CFR .

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Thus, the HS20 axle load of 32, pounds 14, kg becomes an HS25 axle load of 40, pounds 18, kg. Production of standards and specifications for highway design, construction and safety Establishment of uniform symbols for road maps Creation of nationwide route numbering of the primary U.

Since then, the association hb17 worked to strengthen and sustain the national highway and transportation system. The increased load can, in some cases, create the need for additional reinforcing steel and a thicker top slab on underground structures installed in areas exposed to heavy truck loads.

That proposal, subsequently presented to the U. By Claude Goguen, P.

This goal will focus on: Re-establish transportation as a national priority. Compliance with standards — the basics of quality products.

View Document – California Code of Regulations

There was some concern during the end of the 20th century that the HS20 truck load rating did not adequately reflect actual conditions. Congress, laid the groundwork for the historic Federal Aid Highway Act of Congress to conduct surveys, provide data and testify on transportation legislation though a non-government body. LRFD is based on new developments in bridge engineering, sound principles and a logical approach to ensure constructability, safety, serviceability, inspectability, economy and aesthetics.

Standard specifications for highway bridges For many years, precast manufacturers of underground products used designs that complied with either AASHTO HS or Alternate Military Loading Interstate Loadingwhichever standard correlated to the worst condition that could be applied to the structure.


Under the leadership of its first president, Henry Shirley of Maryland, the participants approved a legislative proposal authorizing participation of the federal government in highway construction.

These efforts have included the advocacy of other landmark federal legislation from the act that launched the Interstate Highway System in to the still-pending reauthorization of the Transportation Equity Act for the 21st Century. Standard specifications for transportation materials and methods of sampling and testing AASHTO publishes another set of specifications that precasters may often reference in manufacturing and quality control of their products: The LRFD philosophy is consistent with other major bridge design codes adopted or being developed in Asia, Canada, Europe and other parts of the world.

Department of Transportation, and state governments followed suit with similar reorganization. That meeting in the U.

For precasters who manufacture products that are part of transportation projects such as manholes, pipe, box culverts, stormwater structures, utility vaults, traffic barriers, and retaining and sound wallsan awareness of the background and purpose of AASHTO standards helps to emphasize the importance of manufacturing specification-compliant, quality precast concrete products.

The focus of the association evolved from highway-only to its present-day oversight of virtually all forms of transportation air, rail, water, and public transportation.

Not all of the corresponding standards specific to various precast products manholes, pipe, box culverts and others are listed here visit www. This happened after various federal agencies were brought together under the U. Assist state DOTs with leadership and performance.

The latest version is the 30th edition and contains material specifications and test methods commonly used in the construction of highway facilities, including 10 new and 69 updated specifications and test methods. Many transportation agencies in other aashgo belong to the association as associate non-voting members.


The Alternative Military Load also known as Interstate Load was created to cover axle loads from heavy military equipment.

Understanding AASHTO

Leave a Reply Cancel reply Your email address will not be published. It is a nonprofit, nonpartisan association representing highway and transportation departments in the United States and Puerto Rico. It represents five transportation hg-17 Its primary goal is to foster the development, operation and maintenance of an integrated national transportation system.

Many of the specifications that are pertinent to precast concrete have equivalencies in ASTM. As the Interstate Highway System evolved in the s, one of its goals was to transport military vehicles.

Understanding AASHTO

The association provides a forum for consideration of transportation issues and is frequently called upon by the U.

All state Departments of Transportation are active members, as are several substate and federal transportation agencies in the United States. Your email address will not be published. The recommendations from this document are hb1-7 in ASTM specifications written for underground precast concrete structures such as C, C, C, C and C The primary intent of this goal is to attain a world leadership role in the development of transportation standards and other technical services.

Subsequent to the development of the new LRFD specifications, FHWA announced that all state bridge projects using federal funding must use the new and superior code. Provide world-class technical services.