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原文传递 FHWA FIBER-OPTICS RESEARCH PROGRAM: CRITICAL KNOWLEDGE FOR INFRASTRUCTURE IMPROVEMENT.

题名：	FHWA FIBER-OPTICS RESEARCH PROGRAM: CRITICAL KNOWLEDGE FOR INFRASTRUCTURE IMPROVEMENT.
作者：	Livingston-RA
关键词：	BENEFIT-COST-ANALYSIS; DATA-COLLECTION; FIBER-OPTICS; HIGHWAY-BRIDGES; INFRASTRUCTURE-; LAS-CRUCES-NEW-MEXICO; MONITORING-; PAVEMENT-CRACKING; PAVEMENT-PERFORMANCE; SENSORS-; STRAIN-GAGES; STRAIN-MEASUREMENT; STRUCTURAL-ANALYSIS; STRUCTURAL-DETERIORATION-AND-DEFECTS; U.S.-FEDERAL-HIGHWAY-ADMINISTRATION
摘要：	A nondescript highway bridge on Interstate 10 in Las Cruces, New Mexico, is the frontline project in a farsighted Federal Highway Administration (FHWA) research program that is exploring the use of fiber-optic sensors in highway applications, including both structures and pavements. Throughout the bridge are 120 calibrated Bragg grating fiber-optic strain sensors: more than any other steel bridge in the world. Traditionally, structural monitoring has typically involved networks of only 10-20 strain gauges, yielding data that is generally insufficient for detecting early signs of deterioration. The new capability of installing large numbers of sensors in a system suggests a new, much more reliable approach. While the application of fiber-optic sensor networks to all 576,000 bridges in the nation's infrastructure may not be justified from a cost-benefit perspective, the technology presents considerable advantages for three categories of bridges in particular: existing bridges that have severe deterioration; major bridges that form critical links in urban transportation systems, especially in seismically active areas; and bridges made of novel materials, such as polymer composites, for which little information on performance currently exists. This key FHWA research program is seeking to provide an information base for an effective cost-benefit analysis, investigating issues such as overall monitoring strategy, systems architecture, installation procedures, temperature compensation, durability, compatibility with other materials, sensor standardization, and data analysis. A sidebar presents the operating principle of Bragg fiber-optic sensors.
总页数：	Public Roads. 1999/07. 63(1) pp13-19 (2 Phot., 4 Fig., 25 Ref.)
报告类型：	科技报告