Refined Load Rating through Rapid Modal Testing
| 项目名称： | Refined Load Rating through Rapid Modal Testing |
| 摘要： | The Targeted Hits for Modal Parameter Estimation and Rating (THMPER) system is a rapid modal impact trailer, a mobile work station, and streamlined data processing software that is used to extract modal parameters (natural frequencies and global mode shapes) of highway bridges during brief traffic slow downs or partial lane closures. The modal testing trailer is comprised of a Falling Weight Deflectometer (FWD) that was significantly reconfigured to (1) provide a single, large (~30kip) broadband impact source, and (2) collect the resulting free-decay response of the bridge's surface both locally (at the impact location) and globally (via wireless, global positioning system (GPS) synchronized stationary sensors installed along available sidewalks/shoulders out of the way of traffic). Once collected, the data is ported to a semi-automated modal processing software which performs (1) data quality checks, (2) frequency response function development, and (3) modal parameter estimation. The proposed research aims to validate this emerging technology using a typical highway bridge as a test specimen through a three tiered comparison with current �best practices� approaches. First, the THMPER system�s effectiveness as a modal testing approach will be assessed through a comparison of modal parameters obtained from a conventional modal test. Second, a finite element model calibration will be performed and compared using results from the THMPER system and from a conventional truck load test. Finally, an Load and Resistance Factor Rating will be obtained from each finite element model and compared. |
| 状态： | Active |
| 资金： | 38039 |
| 资助组织： | Office of the Assistant Secretary for Research and Technology |
| 管理组织： | New Jersey Department of Transportation |
| 项目负责人： | Kasbekar, Nagnath |
| 执行机构： | Center for Advanced Infrastructure and Transportation |
| 主要研究人员： | Moon, Franklin |
| 开始时间： | 20170601 |
| 预计完成日期： | 20180831 |
| 实际结束时间： | 0 |
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