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Description: Data on the market share of the four major bridge construction materials used in the U.S. (reinforced concrete, prestressed concrete, structural steel, and timber) are summarized in this report. Data are extracted from the National Bridge Inventory (NBI) as of December 2006. Tables and figures present information on both the number and deck area of existing bridges. To focus on current trends, data are also presented for bridges built during 1990-2006. The market share and performance (structural deficiency) of bridge materials are given by year of construction. This report updates data published in a similar document in December 2004.
Table of Contents:
Abstract
The National Bridge Inventory
Data Used in this Report
Bridge Condition
Limitations of Data
Overview of Data Presented in Appendix A
Observations on Market Share and Bridge Condition
References
Appendix A: Summary of Market Share and Bridge Condition Data
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