Limitations for Semi-Integral Abutment Bridges
| 项目名称： | Limitations for Semi-Integral Abutment Bridges |
| 摘要： | Semi-integral abutments are known to help reduce various serviceability issues in bridges while also allowing for construction in various situations where integral abutments would be prohibited. The reduction in serviceability issues is because when compared to stub abutments, semi-integral abutments have fewer joints that are likely to leak. Compared to integral abutments, semi-integral abutments generally have less restraint in the longitudinal direction, resulting in less severe concrete cracks due to thermal expansion and contraction (Phares et al., 2015). Semi-integral abutments with less cracking results in less deterioration because of the minimized penetration of water and deicing salts. Even more, there are some instances where integral abutments simply will not work well and semi-integral abutments offer an opportunity to achieve a high level of performance. This research project will pursue three main research objectives: (1) Perform a literature search with respect to state department of transportation (DOT) limits (e.g., bridge length, skew, etc.) for semi-integral abutments. Include summary of semi-integral abutment details used by state DOTs. (2) Inspect and report on Iowa bridges which include semi-integral abutments and tied approach details. (3) Establish a field monitoring program for at least two semi-integral abutment bridges for a period of 2 years. Selected bridges with semi-integral abutment should include one or more of the following attributes: Skews equal to or greater than 45 degrees; Total bridge expansion length equals or exceeds the DOTs integral abutment limits. Numbers 1 and 2 are being performed as part of the original IHRB-16-15 "Increase Service Life at Bridge Ends through Improved Abutment and Approach Slab Details and Water Management Practices. This research project should be able to summarize the relevant findings from that research project. To achieve the objectives of this project, six tasks are proposed. The tasks will be performed in very close communication with a Technical Advisory Committee (TAC) throughout the duration of the project. To this end, the research team plans to hold quarterly meetings with the TAC to update them on progress and to ensure that the research direction is as desired. Task 1. Perform literature search; Task 2. Conduct a survey of state DOTs; Task 3. Inspect a selected set of Iowa bridges; Task 4. Field monitoring of semi-integral abutment bridges; Task 5. Develop design guidelines and details; and Task 6. Final Report. |
| 状态： | Active |
| 资金： | 89990 |
| 资助组织： | Iowa Department of Transportation |
| 管理组织： | Iowa State University, Ames |
| 项目负责人： | Abu-Hawash, Ahmad |
| 执行机构： | Iowa State University, Ames |
| 主要研究人员： | Shafei, Behrouz |
| 开始时间： | 20171115 |
| 预计完成日期： | 20201031 |
| 实际结束时间： | 0 |
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