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Year - 2013

Seismic Evaluation and Retrofit of Deteriorated Concrete Bridge Components

Corrosion of steel bars in reinforced concrete structures is a major durability problem for bridges constructed in the New York State (NYS). The heavy use of deicing salt compounds this problem. Corrosion of steel bars results in loss of steel cross section, deterioration of bond between concrete and reinforcing bars, and more important, in most cases, it results in unsymmetrical concrete section that is susceptible to shear stresses produced by torsion.

Seismic Evaluation and Retrofit of Deteriorated Concrete Bridges

The findings of this investigation suggest the need for seismic retrofit of deteriorated reinforced concrete bridge columns, particularly, those with corroded lap splice in the longitudinal reinforcement. The study also suggests the need for retrofit of corroded pedestal over piers and abutments, as they may cause sudden unseating of girders.

Benchmarking for Asset Hierarchy, Criticality Assessment and Risk Analysis at the MTA and other Transportation Companies

The NYCT has begun an enterprise-wide Asset Management Improvement Program (AMIP). In the second half of 2012, the NYCT developed an executive-level concept of operations (ConOps) that defined a new asset management framework following a systems engineering approach. The proposed project for new standards for asset hierarchy, criticality and risk (the “Project”) is needed as a fundamental element within this framework.

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