Victor Hunt | University of Cincinnati (original) (raw)

Papers by Victor Hunt

Transportation Research Record, 2001

Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251), 1999

This paper reports on results from an ongoing project to study stnrcturrnl identification-based a... more This paper reports on results from an ongoing project to study stnrcturrnl identification-based approaches to the condition assessment of a m s h c t d facilities. under such an approach baseline and sequentially idenhtied system models would be used comparatively to track changes in system parameters andto infer the omset, location, and extent ofstnrctural damage7 deterioration, d o r defects. As part of the

In this paper, a methodology for integrating a monitor and its warning system with results from b... more In this paper, a methodology for integrating a monitor and its warning system with results from both truckload tests and structural analysis is presented for the Jeremiah Morrow Bridge. Wireless data collection system, data cleansing and archiving procedures, linear regression prediction model, and capacity rating based upon truckload test results for the instrumented members are detailed. The truckload test and monitored responses document the " normal " or expected behavior of the structure to traffic and environment, respectively. A warning system is then designed upon a threshold technique which minimizes the probabilities of false alarms and the missed detection of critical events based upon the capacity rating. Past results of the implemented system for the Jeremiah Morrow and other bridges are discussed. Alarm scenarios are reviewed based upon the collected historical data from the monitors and generated warnings.

Under certain weather conditions, the Veterans' Glass City Skyway (VGCS) Bridge in Toledo, Ohio, ... more Under certain weather conditions, the Veterans' Glass City Skyway (VGCS) Bridge in Toledo, Ohio, accumulates ice on the stay sheaths in such a way that has led to large fragments falling into traffic lanes. To aid the Ohio Department of Transportation (ODOT) in their response to this, an automatic inference and monitoring system was implemented. This system utilizes existing weather station measurement data to infer possible events, alerting officials and providing tools to further assess the situation. The development of the decision, the algorithm, and implementation process are presented. The system was implemented in January 2011, and it warned of and monitored an icing event that occurred February 20e24, 2011. Ice fell shortly after the system indicated conditions were met for icefall. ODOT personnel used the ice inference system to assist them in managing the response to the icing event.

According to the National Bridge Inventory, many of the highway bridges that were built from the ... more According to the National Bridge Inventory, many of the highway bridges that were built from the 1950's to the 1970's are experiencing deterioration after 30 to 50 years service . Studies have shown that about one-third of these bridges are either structurally deficient or functionally obsolete . Efficient and reliable diagnostic methods used to evaluate remaining capacity and service life are critical for effective infrastructure management.

Structural Materials Technology III: An NDT Conference, 1998

On-line, continuous monitoring technologies of a rigorous and objective nature are sought to quan... more On-line, continuous monitoring technologies of a rigorous and objective nature are sought to quantitatively identify and evaluate the condition or health of highway structures over their useful lifetime. A global bridge evaluation methodology is under development based upon the structural identification concept, employing modal testing, truckload testing, and instrumented monitoring as its principal experimental tools. Test results are transformed to either modal flexibility or the unit influence line, which have been demonstrated to be conceptual, quantitative, comprehensive, and damage-sensitive signatures. Four test sites were tested, monitored, and studied in order to classify their similar bridge-type-specific behavior mechanisms and to validate the performance of the implemented methodology. Practical, type-specific procedures for instrumented monitoring and nondestructive evaluation can then be developed for the whole group or type of highway bridges.

Journal of Structural Engineering, 1997

ABSTRACT This research seeks the rational organization and integration of nondestructive evaluati... more ABSTRACT This research seeks the rational organization and integration of nondestructive evaluation (NDE) technologies, the methods of structural identification, and concepts of reliability and fault detection, each according to its merits, within a system devoted to monitoring the state-of-health of an instrumented structure. A global NDE methodology has been developed based upon the structural identification concept, employing truckload testing, modal testing, and instrumented monitoring as its principal experimental tools. The test results are transformed to both strain influence lines and modal flexibility, which have been demonstrated to be a conceptual, quantitative, comprehensive, and damage-sensitive signature. These parameters also provide an accurate condition index, since it may be used to conveniently obtain the stress profiles and deflected shapes of a bridge under any loading pattern. The capacity rating for the instrumented section and/or an estimation of the remaining fatigue life for the instrumented member/connection based upon the relevant AASHTO codes can be obtained immediately following the controlled truckload testing of the bridge. This methodology has provided several unique deliverables to the aforementioned field of expertise: 1. The application, verification, and assessment of truckload testing, modal impact testing, and long-term monitoring procedures, as well as their necessary sensor types and positioning, for several highway bridges. 2. A reduced set of quantitative models for the estimation and identification of single and multiple span beam response to truckload and impact in both the time and frequency domains. 3. The quantitative evaluation of the most promising damage indices for the detection of induced damage-types on a decommissioned specimen. 4. The quantitative identification of AASHTO condition indices and their requisite assumptions from the acquired field data. The most important contribution of this research is an objective technique for the accurate field identification of bridge parameters (specifically, strain influence lines and modal flexibility) which not only provide for the timely assessment of structural condition but are also sensitive to typical damage scenarios. These results are achieved without a finite element model, but can also serve to calibrate such a model for greater spatial precision and the investigation of other possible damage scenarios, repair/retrofit schemes, and other structural considerations.

Multi-reference impact testing has been utilized as a basis for as-is condition assessment of hig... more Multi-reference impact testing has been utilized as a basis for as-is condition assessment of highway bridges. The major advantage of a modal (impact) test is the quick setup, execution and teardown of such a test. A modal test can be performed within a 3-4 hour period providing a minimal amount of down time to the structure being tested. Previously, it

Proceedings of Spie the International Society For Optical Engineering, 1997

... 1. Hunt, VJ, Levi, A., Deitz, D., Sobecks, B., Helmicki, AJ, and Aktan, AE (1994). &q... more ... 1. Hunt, VJ, Levi, A., Deitz, D., Sobecks, B., Helmicki, AJ, and Aktan, AE (1994). &quot;Issues in Bridge Instrumentation and Monitoring.&quot; Experimental Mechanics Conference, SEM, Baltimore, MD. 2. Levi, A., Aktan, AE, Helmicki, AJ, and Hunt, VJ (1996). ... N Church Side A sy lum Side ...

Experimental Mechanics, Sep 1, 2010

Proper identification of the cable's resonant frequencies is critical to provide an accurate esti... more Proper identification of the cable's resonant frequencies is critical to provide an accurate estimate of cable force. The MUltiple SIgnal Classification (MUSIC) algorithm is implemented to estimate cable-stayed bridge cable tensions noninvasively from measured cable motion. This algorithm performs eigenanalysis on the data sequence to estimate and eliminate noise contributions before creating its frequency spectrum, providing a more robust estimation approach than traditional Fourier based frequency spectrums. To aid in the selection of cable frequencies, a comprehensive finite difference cable model is simulated and compared to the estimated MUSIC spectrums.

Transportation Research Record: Journal of the Transportation Research Board, 2015

Aspart of a ,project on the ,application and constructability of fiber reinforced polymer (FRP) b... more Aspart of a ,project on the ,application and constructability of fiber reinforced polymer (FRP) bridge decks, four different deck systems were installed in a three-lane, five-span bridge inDayton, Ohio. The spans range from 37 to 45 m, and the bridge consists of six steel girders. The span lengths and large number ,of panels ,created a unique ,opportunity to evaluate

Structural Health Monitoring and Inspection of Advanced Materials, Aerospace, and Civil Infrastructure 2015, 2015