Member-level Redundancy in Built-up Steel Members
| 项目名称： | Member-level Redundancy in Built-up Steel Members |
| 摘要： | The Federal Highway Administration (FHWA) currently has the authority to allow owners to forego fracture-critical inspection for low redundancy bridge structures on a case-by-case basis if supported by a rigorous damage analysis as per American Association of State Highway & Transportation Officials Load and Resistance Factor Design (AASHTO LRFD). However, since there is limited experimental data specifically focused on this issue, using internal redundancy as the sole measure of redundancy cannot be approved by FHWA at this time. Hence, specific research is needed that can be used to evaluate the potential for a fracture propagating from one mechanically fastened element to another in a built-up member as well as the effects on the fatigue resistance of the faulted member. Furthermore, there is no known research that has quantified the energy release (and resulting loads on the remaining section) that is likely to occur during such a fracture event. This project will explore whether internally redundant members (either mechanically fastened built-up members, or those with parallel elements) do posses the internal arrest mechanisms to safely carry loads during and after a fracture event considering one of multiple elements are fractured. The project will be primarily based on full-scale specimens subjected to various fracture simulations for the purposes of gaining deeper understanding of the energy release, load redistribution, and subsequent fatigue resistance of damaged section. However, analytical studies will also be conducted to assist in the development of code-ready assessment methodologies. The project will also assess the role of inspection technique and frequency for internally redundant members considering the research may show they do not fit the AASHTO definition of fracture-critical. Obtaining experimental data in a controlled fashion will provide the needed evidence to establish if internal member redundancy is a reliable redundancy measure to use for collapse prevention in a fracture-critical assessment. This will improve the ability to properly allocate limited bridge inspection resources and improve overall safety of the nation's infrastructure. |
| 状态： | Completed |
| 资金： | 600000 |
| 资助组织： | Federal Highway Administration<==>Iowa Department of Transportation<==>Minnesota Department of Transportation<==>Oregon Department of Transportation<==>Wisconsin Department of Transportation<==>Wyoming Department of Transportation<==>New York State Department of Transportation<==>Army Corps of Engineers |
| 项目负责人： | Nantung, Tommy |
| 开始时间： | 20110802 |
| 实际结束时间： | 20180630 |
| 主题领域： | Bridges and other structures；Highways；Maintenance and Preservation |
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