Implementation of Recommendations for Eliminating Longitudinal Median Joints in wide Bridges
| 项目名称： | Implementation of Recommendations for Eliminating Longitudinal Median Joints in wide Bridges |
| 摘要： | Longitudinal bridge deck joints are commonly used in cases where the roadway carries a larger than typical number of traffic lanes. The Iowa DOT requires the use of longitudinal bridge joints in wide bridges with the hopes of reducing/eliminating the cracking that has been observed in wide bridges constructed without longitudinal joints. The longitudinal joints are thought to provide relief from expansion and contraction of the bridge deck due to temperature change, shrinkage, and life loads. Historically, however, these joints have been known to leak, allowing chloride-laden water to reach the bottom of the deck overhang and even the exterior girders. This has caused cases of premature deterioration. The problem is most severe when the joint is narrow and/or located between median barrier rails where this water can be trapped for long periods of time. Weathering steel bridges are particularly sensitive to this situation as the protective patina may never naturally form. This is a situation where the elimination of one problem (cracking associated with wide bridges) has created a second problem (a problematic longitudinal joint). |
| 状态： | Active |
| 资助组织： | Iowa Department of Transportation |
| 管理组织： | Iowa State University, Ames |
| 项目负责人： | Goetz, Vanessa |
| 主要研究人员： | Freeseman, Katelyn |
| 开始时间： | 20180701 |
| 预计完成日期： | 20220630 |
| 实际结束时间： | 0 |
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