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Articles 511 - 514 of 514
Full-Text Articles in Architecture
Repair Optimization Of Highway Bridges Using System Reliability Approach, Allen C. Estes, Dan M. Frangopol
Repair Optimization Of Highway Bridges Using System Reliability Approach, Allen C. Estes, Dan M. Frangopol
Architectural Engineering
As reliability based methods gain increased acceptance, there is greater opportunity to use scarce resources more efficiently while maintaining a prescribed level of reliability of a structure throughout its service life. The goal is to provide management decisions that will balance lifetime system reliability and expected life-cycle cost in an optimal manner. This study proposes a system reliability approach for optimizing the lifetime repair strategy for highway bridges. The approach is demonstrated using an existing Colorado State highway bridge. The bridge is modeled as a series-parallel combination of failure modes, and the reliability of the overall bridge system is computed …
Life-Cycle Cost Design Of Deteriorating Structure, Dan M. Frangopol, Kai-Yung Lin, Allen C. Estes
Life-Cycle Cost Design Of Deteriorating Structure, Dan M. Frangopol, Kai-Yung Lin, Allen C. Estes
Architectural Engineering
A lifetime optimization methodology for planning the inspection and repair of structures that deteriorate over time is introduced and illustrated through numerical examples. The optimization is based on minimizing the expected total life-cycle cost while maintaining an allowable lifetime reliability for the structure. This method incorporates: (a) the quality of inspection techniques with different detection capabilities; (b) all repair possibilities based on an event tree; (c) the effects of aging, deterioration, and subsequent repair on structural reliability; and (d) the time value of money. The overall cost to be minimized includes the initial cost and the costs of preventive maintenance, …
Lifetime Bridge Maintenance Strategies Based On System Reliability, Dan M. Frangopol, Allen C. Estes
Lifetime Bridge Maintenance Strategies Based On System Reliability, Dan M. Frangopol, Allen C. Estes
Architectural Engineering
This study proposes a methodology for a system reliability-based condition evaluation of existing highway bridges. The approach is illustrated for an existing steel bridge located in Colorado. USA. An optimum lifetime repair strategy based on minimum expected cost is developed. The initial optimum repair strategy is updated using both biennial visual inspections and specific non-destructive evaluation testing.
Reliability Of Reinforced Concrete Girders Under Corrosion Attack, Dan M. Frangopol, Kai-Yung Lin, Allen C. Estes
Reliability Of Reinforced Concrete Girders Under Corrosion Attack, Dan M. Frangopol, Kai-Yung Lin, Allen C. Estes
Architectural Engineering
Corrosion of reinforcement is a major problem affecting a large number of reinforced concrete structures. At present, most reliability-based design studies of reinforced concrete structures do not consider the effects of corrosion. In this paper, we present a reliability-based approach to the design of reinforced concrete bridge girders that are under corrosion attack. Both reserve and residual reliability constraints are satisfied. The approach is based on the American Association of State Highway and Transportation Officials (AASHTO) standard specifications for highway bridges and on data of chloride corrosion of steel in concrete. First, the effects of corrosion on both moment and …