The ODOT Bridge Inspection Manual ( ODOT, 1973)was used to rate the condition of the AWB (Burgess & Nipple, Inc., 2008). Condition rating for protective coating system of suspension components was 6 indicating greater than 5% and less than 10% of the total protective coating system has failed. The main cables individual rating was 2, which is classified as fair condition and the suspension part of the bridge was classified as satisfactory with rating of 6. The following are the locations suggested to be inspected thoroughly based on deficiency in main cables with water retention being prime cause:
• Downstream Cable at panels: 5, 7-11, 14-18, 23, 25, 27, 30, 32-35, 39, 41-46, 48, 49, 51, 55-58, 60, 63
• Upstream Cable at panels: 5-8, 10, 20, 37, 41, 43, 44-47, 50, 55-60, 62
The most recent inspection was the one carried out in November, 2012. Modjeski and Masters (2013) performed the inspection in accordance to NCHRP-534 (Mayrbaurl & Camo, 2004). The inspection was carried on total of four panels from where a total of 13 wire samples were cut and taken for laboratory testing. While conducting tensile test on these sample wires, the ultimate failure strain was not recorded. Therefore, the ‘Ductile Wire Method’ of cable strength prediction could not be applied and the ‘Brittle Wire Method’ was used to estimate the factor of safety of the main cables. However, as there is no evidence of wire break, the wires are possibly more ductile than assumed and ‘Brittle Wire Method’ could have underestimated the safety factor. The samples from only 4 panels were statistically unreliable based on NCHRP-534.
The Cable Strength Evaluation Report (Modjeski & Masters, Inc., 2013) estimated the controlling factor of safety to be 2.41 which will rea...
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...ial secondary/ noise acoustic emission sources and lastly, the fifth experiment simulates a wire break which is the primary source under concern.
Chapter 4 – Review of Data from AWB: The knowledge gained from literature review and laboratory experiments has been utilized in analysis of recorded data from AWB. Description on the installed AE system is presented. A detail analysis of the data from June 2013 for both north and south cable is presented followed by a summary of analysis results from previous four months. It also includes data analysis from the invasive inspection period of 2012.
Chapter 5 – Conclusions: This chapter summarizes the results from the study and provides recommendation for future works. Suggestions for improvement of the monitoring system are provided. In addition, insights are provided for developing improved laboratory testing strategies.
The cables are supported by four steel towers, one at each corner of the grid.
The Bailey Island Bridge is located in Harpswell, Maine on Route 24. Before the making of the bridge, the fishermen that lived on Bailey’s Island wanted a bridge that connected their island to Orr’s Island. The town of Harpsweell made and voted on their decisions in the weekly town meetings (“Bailey”). The project was stalled because of some of the mainlanders in the town, but it was brought back up for discussion in 1912. They first agreed on a “road” which would connect the two islands and would be constructed with timber. This was to cost $3,000. The cost quickly reached $25,000 at a later town meting because they decided to build the bridge with stone and concrete instead. Once the legislature decided to pass a bill stating that it would fun state’s highway and bridge projects, they decided to move forward with the project (Hansen, 36).
BRONX- 25 year old man is found dead after driving off the Bronx Neck Bridge with his girlfriend in the trunk of his car at around 2:00am.
On August 1, 2007 at approximately 6:05 p.m. 1,064-foot section of the 1,907-foot long I-35W highway bridge collapsed into the Mississippi River. This catastrophic failure of the main bridge span resulted in the death of 13 people and injuring 145 others. In total, 111 documented vehicles were on the bridge at the time that it collapsed. Included in this total are 25 construction vehicles.
The 1890 story “An Occurrence at Owl Creek Bridge” by Ambrose Bierce was composed with a structure that shows time fluidity. The story illustrated the perceived function of time as beyond reality as it slows down to the satisfaction of the delusions of protagonist, Peyton Farquhar, as he experiences a dying incident on the day of his execution. Farquhar was charged with the crime of an attempted act to destroy or sabotage the Owl Creek Bridge, and was thereafter sentenced to death by the Federal Army. Farquhar believes as he also leads the readers the same that he has escaped execution and has made his way back home. The dying protagonist’s experience was portrayed in a slow flow of time that seemed to exactly fit the many circumstances that occurred just in time for reality to come and take its place in time.
Barsom (2000) [6], concludes that fatigue is the failure mechanism of the connection. This report was never distributed to the practicing engineers, as only selected SAC committee members received it.
The 21st Century Educator is inundated with a plethora of assessments which dominate the education landscape from one side to the other. Whether one is assessing formatively or summatively, educators are evaluating on a weekly basis. In fact, in Citrus County, students take a reading comprehension test called Fast Bridge three times a year, which helps them see their potential college readiness skills and what improvements they need to work on. They also take a District created assessment twice a year, which consists of 9 grade level passages that they must take over a 2-month period time. This test focuses mainly on all of the standards that our students will be tested on in the Spring FSA. Not to mention, the formative assessments given on a
this is called toxicological or other product safety assessment. And some tests are used for an assortment of other vital tests.... ... middle of paper ... ...
Knob and tube wiring was state-of-the-art up until around 1950. The main concerns with this old wiring method is overheating, deteriorating insulation, improper connections, and that it is not a grounded system. K&T wiring was ideal for when it was originally designed to hold modest currents. But nowadays the electrical demands for the average house are considerably greater. Sixty years ago t...
Most of the laboratory tests ordered from critically ill patient and acute areas such as operating room (OR), emergency department (ED), and Intensive Care Unit (ICU) are performed in the core or stat laboratory. This process is a time consuming
Reese, C.D. and Eidson, J.V. (1999). Handbook of OSHA construction safety and health. Boca Raton, FL. CRC Press
The importance of an electrical lineman is huge, not only in the community but also in most of the world. Their education, training, and correct use of equipment help them in their different and dangerous work conditions to accomplish the tasks of providing power to their communities.
... failure, only 650 failures recorded, which only covers 7.1% of the whole errors made by the workers or robots in the factory. This means high load level has 7.8 times increased risk or failure rate compare to low load level, and moderate load level obtained 5.3 times.
Engineering designers must consider how much metal is necessary to withstand the anticipated load for a given application. Since they can make mistakes, or the structure can be misused, they are required to over design the aircraft by a safety factor. Once the necessary mechanical load safety factor has been considered, it becomes necessary to consider whether what corrosion allowance is necessary to keep the aircraft safe.
they began to disjoin. The cable now in a "v" shape with the weight of