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Title:	The Selection of Bridge Materials Utilizing the Analytical Hierarchy Process
Author(s):	Smith, Robert L.; Bush, Robert J.; Schmoldt, Daniel L.
Date:	1997
Source:	Proceedings, 1997 ACSM/ASPRS Annual Convention and Exposition. 4: 140-150.
Description:	Effective decisions on the use of natural resources often require the input of many individuals. Determining how specific criteria affect the selection of materials can lead to better utilization of raw materials. Concrete, steel, and timber represent over 98% of the materials used for bridge construction in the United States. Highway officials must often consider alternate materials for the best application for bridges. The Analytical Hierarchy Process (AHP) was used to characterize the bridge material decision process of highway officials in selected states. State Department of Transportation Engineers, private consulting engineers, and local highway officials were personally interviewed to identify this often subjective decision and to model the selection decision for different groups of decision makers. Prestressed concrete was the material choice in the majority of cases. This was followed by reinforced concrete, steel, and timber. The most important criteria were maintenance requirements, lifecycle costs, and lifespan of material. Local highway officials chose timber more often than other highway officials.
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