Deflection control is the crucial procedure in construction control of cantilever prestressed concrete continuous girder bridge. This paper summarizes the advantages of Grey theory’s poor information processing and abilities of Neural Network’s self-learning and adaption, and the combinational algorithm of grey Neural Network is applied to the prestressed concrete bridge cantilever construction...

This paper describes a study evaluating increase in design strength, performance and capacity when including bridge parapets in a bridge analytical model. Traditionally, concrete parapets are treated solely as superimposed dead load in an overall bridge structural design. Parapets are detailed from a safety standpoint to resist impact forces from vehicle loading. However, in the global design m...

Corrosion of steel reinforcement in concrete structures and bridges is a major problem facing the departments of transportation worldwide. In the United States, maintenance and replacement costs are measured in billions of dollars. Salt environment in hot climate and the use of deicing salts in cold regions have resulted in steady deterioration of bridge decks due to corrosion. These concerns h...

Conductive concrete is a cementitious admixture containing a certain volumetric ratio of electrically conductive materials to attain high and stable electrical conductivity. Due to its electrical resistance, a thin overlay of conductive concrete can generate enough heat to prevent ice formation when energized by AC power. Under a research sponsored by Nebraska Department of Roads, Yehia and Tua...

Instrumentation, structural modeling, and model updating are incorporated into the design and construction process of a multi-span bridge to change the paradigm of traditional bridge design to a long-term bridge design. A continuous three span composite steel stringer bridge in Barre, Massachusetts was used as a pilot bridge. A monitoring system was installed in order to capture structural beha...

compacted low strength material (clsm) made with material such as fly ash and recycled aggregates is used as filler at city infrastructure canals without compaction need. experimental small specimens and large canals were casted with this concrete and tested to give several results. test results of compression strengths on 12 different designs shows that this concrete with high workability and ...

Bridges, as an essential part of transportation system, play a special role in economy, politic and military all around the world. Serviceability of bridges is of high importance especially in emergencies, helping injured people and proportioning transportation after earthquakes. Earthquake regulation codes, normally suggest linear methods to conduct the analysis, and nonlinear analysis is bare...

Sensitivity analysis of the early-age properties of high-performance concrete – a case study on bridge barrier walls

Repairing deteriorated concrete bridge piers using externally wrapped FRP (fiber reinforced polymer) composites has been proven as an effective approach. This technique has also been applied to low-rise building structures. Failures in FRP-wrapped concrete structures may occur by flexural failures of critical sections or by debonding of FRP plate from the concrete substrate. Debonding in the FR...

15. Supplementary Notes Supported by a grant from the U.S. Department of Transportation, University Transportation Centers Program 16. Abstract Inspections of bridge substructures in Texas identified surface deterioration of reinforced concrete columns on bridges continuously exposed water. Initial hypothesis were that the surface deterioration was a result of the acidity of the water in which ...