Recommended AASHTO Guide Specifications for ABC Design and Construction (2018) / Chapter Skim
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NCHRP Project 12-102 4 C H A P T E R 1 Background 1.1 Problem Statement and Research Objectives ABC is not new to the United States Bridge market; however the use of ABC technologies in the United States has expanded dramatically over the last decade. Prior to this period, the use of ABC was limited to special projects that necessitated the use of ABC because no other reasonable alternative existed.
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NCHRP Project 12-102 5 This project will accumulate all existing and proven ABC technologies, but does not look to break new ground or develop new technologies. The goal will be to establish a framework document, where future research and technologies can be accommodated and housed in one place, as they mature to the stage of meriting specification language as opposed to inserting the technologies piecemeal into existing documents.
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NCHRP Project 12-102 6 Prefabricated Bridge Elements and Structural components of a bridge that are built off site or near Systems (PBES) site that include features that reduce the on-site construction time that occurs with conventional bridge construction.
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NCHRP Project 12-102 7 1.1.2.3 Deck Elements Aluminum Deck A full thickness deck made with extruded aluminum elements that are connected to form an orthotropic deck system. Exodermic Deck A steel grid deck system made with a partially filled concrete composite topping that is placed above the top of the grid.
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NCHRP Project 12-102 8 Precast Cap Shell A reinforced concrete element that is fabricated without the core concrete. The core concrete is placed after the shell has been erected.
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NCHRP Project 12-102 9 Precast Sheet Pile A vertical precast element that is driven or jetted into the soil to create a cantilever wall (abutment or retaining wall)
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NCHRP Project 12-102 10 Bars in Splice Coupler A connection that provides tension, shear and/or moment force transfer between two precast concrete elements via a mechanical connection that uses a projecting bar from one element grouted into a reinforcing bar splice device cast into the adjacent element. Closure Joint A gap between two elements or systems that is filled with materials to form a connection.
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NCHRP Project 12-102 11 Falsework Temporary construction used to support portions of the entire permanent structure until it becomes self-supporting. Falsework could include steel or timber beams, girder column piles and foundations, and any proprietary equipment including modular shoring frames, posts shores, SPMT, and horizontal shoring.
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NCHRP Project 12-102 12 1.1.3 Related Research Projects 1.1.3.1 NCHRP Project 12-98 A second NCHRP ABC related research project entitled "Recommended Guidelines for Prefabricated Bridge Elements and Systems Tolerances and Dynamic Effects of Bridge Moves" was underway during the development of this project. The objective of this project was to develop AASHTO format guidelines for the two subjects stated in the project title.
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