Serviceability-related issues for bridge live load deflection and construction closure pours.
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2015-06-01
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Abstract:This study investigated the design criteria and practices in an effort to improve the quality of bridge designs in the
State of Maryland and beyond. This first criterion investigated was the live load deflection for steel bridges. The
second design/construction criterion investigated was designing and detailing bridge deck closure pours.
Previous and current practices and future planning on the serviceability of bridges have been documented.
State-of-the-practice methods from federal and other state agencies were collected. Three bridges were chosen for
refined analyses to investigate the live load deflections. Field measurements for these three bridges were collected
from the research team to facilitate this study. Thirty steel girder bridges from the Maryland State Highway
Administration’s (SHA) inventory were selected for statistical analyses. Steel bridges designed with the live load
deflection limit have been evaluated. Closure-pour analyses were conducted by line-girder models,
two-dimensional grid models or three-dimensional finite element models. All three methods generate accurate
enough camber diagrams to predict differential deflections between stages for straight girder systems, if creep is
not considered. Creep effect could be alleviated by proper camber and scheduling on pouring.
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