These tests concluded that the live loads were not excessive and that the loading caused some vibrations in the individual members of the structure. It was the second eyebar suspension bridge consisting of heat-treated eyebars, and a rocking base was constructed on the Ohio river. We are investigating the cause of the incident," a spokesman from the Hong Kong Airport Authority said. It was determined that the stress reversal was unique to a few eyebars because the vehicle lanes were not centered on the roadway. VIP members get additional benefits. The composition of the atmosphere also played a critical role in the state of the steel. The traffic on the bridge was crawling. Country Its objectives were to identify the cause of the failure of the bridge, to figure out how to fund a new bridge in an efficient manner, and to define a system of standards that would ensure the safety of the bridges in the country. Some of them are discussed below: The U.S. Army Ordnance Group ruled out the possibilities of explosions and impacts. The suspending eyebar chain acted as the top chord of a variable-depth stiffening truss. This shift could have been induced by sediments around the piers being washed away (known as scour), a deficiency in the foundation that would cause the anchors and piers to move, or an impact to the piers from a water vessel. Point Pleasant Bridge Disaster: Collapse of the Eyebar-Chain Suspension Bridge, Mackinac Bridge: Construction of the Most Aerodynamically Stable Suspension Bridge. However, certain characteristics suggested the cause of the failure of the material. The study of high-strength steel in the environment determined that the combination of stress corrosion (due to tensile stress in a corrosive environment) and fatigue corrosion (induced by the oscillation of loading in the corrosive environment) led to the propagation of the crack in the eyebar and caused the failure of the eyebar and ultimately caused the collapse of the bridge. Sorry, you do not have permission to ask a question, You must login to ask question. You will receive a link and will create a new password via email. The use of all rear bridges has been suspended for inspection, the official said, adding that passengers however would continue to board aircraft via the head bridges that are normally used by first class travellers. Please enter your email address. Beyond The Headlines: Memories of Mosul three years after ISIS, Beyond The Headlines: The UAE's tactic against food crisis, Beyond the Headlines: Iran's secret affair with Al Qaeda, Ethiopia's Abiy Ahmed – from Nobel Peace Prize to the brink of war. Please follow the instructions below to allow notifications to be sent from The National. The narrow gap between the eyebar and the connecting pin made the problem worse. The boarding bridge for a Cathay flight bound for Nagoya in Japan suddenly collapsed after all of the 262 passengers had boarded the aircraft last night, according to the Hong Kong Airport Authority and the airline. Rocker towers were hinged at the bases to accommodate thermal deformations. And she's pledged some … The brittleness of the steel connection, and thus its susceptibility to sudden fracture, was enhanced by two factors. Dozens fell off the edge, tumbling 45m to the ground below, resulting in 43 deaths. It first verified with the military that no airplanes had passed through the vicinity at the time of the collapse. It was considered to be the most unique and cost-effective bridge. Testing showed that as the environmental temperatures decreased, the material was more susceptible to fracture. When the Point Pleasant Bridge was being constructed, the knowledge of long-term fatigue combined with the crevice corrosion was limited. The twitterverse is showing the damage done at Hong Kong airport in a double airbridge collapse early last night. What are the Installations Required in a Tunnel? This limit contrasted with higher factors of safety, 2.75 and 1.75 respectively, for an alternate conventional suspension design. However, the steel used was of unusually high strength, and its properties were not well known. Tests of different eyebars showed a consistent composition between the specimens, which indicated that the fractured eyebar was not unique. Beyond the Headlines: will vaccines help us return to normal in 2021? Less than a week ago, another bridge collapse, this time in Shenzhen, next door to Hong Kong injured 19 people, five seriously, the China Daily reported. A truck driver and teenage girl are killed when suspension cables snap on a French bridge, with prosecutors saying the deadly collapse was apparently caused by … "No passengers or crew members were on the air bridge at the time. 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