Topic > Analysis of the ODOT Bridge Inspection Manual - 1277

The ODOT Bridge Inspection Manual (ODOT, 1973) was used to evaluate the condition of the AWB (Burgess & Nipple, Inc., 2008). The condition rating for the suspension component protective coating system was 6, indicating that more than 5% and less than 10% of the total protective coating system failed. The individual rating of the main cables was 2, which is classified as fair condition, while the suspended portion of the bridge was classified as satisfactory with a rating of 6. Below are the suggested locations to thoroughly inspect based on the deficiency of the main cables with water retention main cause:• Downstream cable to panels: 5, 7-11, 14-18, 23, 25, 27, 30, 32-35, 39, 41-46, 48, 49, 51, 55-58, 60, 63 • Upstream cable to panels: 5-8, 10, 20, 37, 41, 43, 44-47, 50, 55-60, 62L' most recent inspection was carried out in November 2012. Modjeski and Masters (2013) carried out inspection in accordance with NCHRP-534 (Mayrbaurl & Camo, 2004). The inspection was carried out on a total of four panels from which a total of 13 wire samples were cut and taken for laboratory testing. When performing the tensile test on these sample cables, the ultimate breaking strain was not recorded. Therefore, the “ductile wire method” could not be applied to predict the cable strength and the “brittle wire method” was used to estimate the safety factor of the main cables. However, as there is no evidence of wire breakage, it is possible that the wires are more ductile than assumed and the "brittle wire method" may have underestimated the safety factor. Samples from only 4 panels were statistically unreliable based on NCHRP-534. The Cable Resistance Evaluation Report (Modjeski & Masters, Inc., 2013) estimated the safety control factor to be 2.41, which will reach... half paper ......ial emission sources secondary acoustics/noise and, finally, the fifth experiment simulates the breaking of a wire which is the primary source in question. Chapter 4 – Review of AWB data: The knowledge gained from the literature review and laboratory experiments was used in the analysis of the data recorded by AWB. The description of the installed AE system is presented. A detailed analysis of June 2013 data for both the North and South Cables is presented, followed by a summary of the analysis results from the previous four months. It also includes data analysis from the 2012 intrusive inspection period. Chapter 5 – Conclusions: This chapter summarizes the findings of the study and provides recommendations for future work. Suggestions for improving the monitoring system are provided. Additionally, insights are provided for the development of improved laboratory testing strategies.