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MODAL TESTING FOR NONDESTRUCTIVE EVALUATION OF BRIDGES: ISSUES.
| 题名： | MODAL TESTING FOR NONDESTRUCTIVE EVALUATION OF BRIDGES: ISSUES. |
| 作者： | Khalil-A; Greimann-L; Wipf-TJ; Wood-D; Brink-M (Editor) |
| 关键词： | BRIDGES-; CRACKING-; ENVIRONMENT-; EXCITATION-; INSPECTION-; MODAL-TESTING; NONDESTRUCTIVE-TESTS; PLATE-GIRDER-BRIDGES; REHABILITATION-MAINTENANCE; STIFFNESS- |
| 摘要： | Currently, global bridge inspection relies primarily on visual inspection with its well-known limitations. Among the promising global non-destructive methods is modal testing on which research has been conducted for two decades. The concept of the method is that modal characteristics (frequencies and mode shapes) of the structure are directly related to its stiffness properties which change as the structure deteriorates. At Iowa State University, a research program has been initiated to study modal testing using ambient excitation with the objective to determine the ability of the method to detect, locate, and determine the measurable size of defects in steel plate girder bridges. Effects of several factors on modal signatures are examined either experimentally or theoretically: environmental conditions, excitation trucks, pseudo-structural defects, deck rehabilitation, and structural cracks. The experimental portion consisted of modal tests on a bridge (Boone River Bridge in Hamilton county, Iowa) that was made available for the current investigation by the Iowa DOT. This paper presents the experimental investigation: motive, investigated parameters, and test program. Since the research is still in progress, only some preliminary results are given. Considering these results, the modal testing procedure presented proved to be an efficient method to monitor the health of bridge structures. |
| 总页数： | Conference Title: Crossroads 2000. Location: Ames, Iowa. Sponsored by: Iowa State University and Iowa Department of Transportation. Held: 19980819-19980820. 1998. pp109-112 (5 Fig., 2 Tab., 8 Ref.) |
| 报告类型： | 科技报告 |
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