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Reliability Based Inspection of Sign, Signal and Luminary Supports in Ohio

Mazumder, Souvik
http://rave.ohiolink.edu/etdc/view?acc_num=toledo148093930959928

Abstract Details

2016, Master of Science, University of Toledo, Civil Engineering.
This thesis is an initial investigation into developing guidelines and criteria for reliability based inspection of overhead sign supports, bridge mounted sign supports, high light mast supports and signal supports. The desired result of reliability based inspection is to use the support condition and age to determine the inspection interval and depth of inspection to keep the all the supports in the inventory at a desired level of safety while economizing on the resources required to perform inspections. Ohio’s inventory of supports is aging and it is important to safely and economically make decisions about inspection, maintenance and replacement. Currently, the Ohio Department of Transportation (ODOT) routinely performs qualitative ground based inspection of its supports. Per ODOT’s inspection guidelines, overhead sign supports are inspected once every five years; bridge mounted sign supports and signal supports are inspected annually and there is no formal requirement for high light mast support structural inspections. The literature and standards on support inspection were reviewed. No previous work on reliability based inspection of supports was found. Due to the absence of reliability based inspection models for supports, the concepts of reliability based bridge inspection program were adopted to support inspection. In this study, the reliability of ODOT’s ground based inspection and detailed inspection results for a sample of Ohio’s supports were assessed to estimate the probability of failure of the supports and evaluate the probability of detection of the support inspection. Based on this assessment, a cost effective reliability based support inspection model was suggested and a model inspection form was provided. Reliability based inspection depends in large part on the accuracy of the inventory and depth of previous inspections. A limitation of the results of this study is that the available database does not have the temporal data necessary to accurately estimate the rate of deterioration. An accurate inventory and a historical record of inspections of the appropriate level of depth to identify likely failure modes are features of a database required for statistically significant studies of the existing inventory. These features of the inventory are necessary to provide a reliability basis for a support inspection program where the frequency of inspection depends on deterioration rate of the supports. The recommendations address how to obtain more detailed inspection data for more accurate calculation of the reliability of supports. Reliability based inspection has the potential to help ODOT be confident that all the supports are carrying out their design function in a safe way as well as to allocate resource for support inspection in more efficient manner. However, it will require an accurate inventory, good inspection reports and appropriate in depth inspections.
Douglas Nims (Advisor)
Mark Pickett (Committee Member)
Liangbo Hu (Committee Member)
85 p.
Civil Engineering
Reliability based Inspection,Sign and signal support,High mast light support,Bridge mounted support, Overhead sign support,Support inspection,Inspection interval,Probability of failure,Probability of Detection, Inspection database, Recommendation,Ohio

Recommended Citations

Citations

  • Mazumder, S. (2016). Reliability Based Inspection of Sign, Signal and Luminary Supports in Ohio [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo148093930959928

    APA Style (7th edition)

  • Mazumder, Souvik. Reliability Based Inspection of Sign, Signal and Luminary Supports in Ohio. 2016. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo148093930959928.

    MLA Style (8th edition)

  • Mazumder, Souvik. "Reliability Based Inspection of Sign, Signal and Luminary Supports in Ohio." Master's thesis, University of Toledo, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo148093930959928

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Toledo and OhioLINK.