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原文传递 Investigation of repair techniques for deteriorated end regions of prestressed concrete bridge girders

题名：	Investigation of repair techniques for deteriorated end regions of prestressed concrete bridge girders
正文语种：	eng
作者：	William B. Rich;Christopher S. Williams;Robert J. Frosch
作者单位：	Martin/Martin in Denver Colo;Purdue University;Purdue University
关键词：	Corrosion; bridge; end region repair; externally bonded reinforcement; fiber-reinforced polymer; FRP; girder; near-surface-mounted reinforcement; NSM; prestressed concrete bridge girders; shear strengthening
摘要：	Deterioration of the end regions of prestressed concrete bridge girders is commonly observed in the field when girders are exposed to chloride-laden water that has leaked through failed expansion joints. Because the deterioration is often localized to the end regions of the girders, reliable repair techniques can provide a means to extend girder service life, avoiding the need for immediate superstructure replacement. To evaluate different repair methods and identify key design considerations for end region repair, shear tests to failure were conducted on prestressed concrete girders extracted from a decommissioned superstructure. Three repair systems were evaluated: an externally bonded fiber-reinforced-polymer (FRP) system, a near-surface-mounted FRP system, and a concrete end block. Only the externally bonded FRP system successfully restored both the strength and initial stiffness of the girder. Although the other two methods were not successful, the tests on the repaired girders highlight important factors that must be considered when designing repairs or conducting further research. The tests also demonstrate that end region deterioration can cause significant (> 40%) reductions in strength, underscoring the importance of addressing such deterioration observed in the field.
出版年：	2023
期刊名称：	PCI Journal
卷：	68
期：	2
页码：	52-70