A towering bridge over a bay in eastern Taiwan has collapsed sending an oil tanker truck falling onto boats in the water below. The traffic on the bridge was crawling. A few hours after the collapse, the St. Mary’s Bridge was closed for safety as its design was similar to that of the Point Pleasant Bridge. Following this incident, the U.S. government brought several new reforms to check the functionality and safety of bridges across the nation. Each bridge was to be inspected every two years. The importance of this standardization is to allow the accurate rating and comparison of the bridges in the inventory. The stress calculations that had been prepared for the design were verified for assurance that the bridge met the engineering criteria that were used at the time of construction. This response was important because the Ohio River played a major role in the transportation of freight, and the wreckage prevented ships from navigating the waterway. This exceedance would cause the eyebar to detach from the pin, allowing the connection to rotate and thus cause the collapse. The oil tanker that was traversing the bridge at the time fell into the water and caused a fire when it struck three fishing boats that were below the bridge. Hong Kong leader Carrie Lam warned that what Hong Kong is experiencing now is actually worse than the 2008 global financial crisis. In 1968, the U.S. federal government enacted a procedure for national bridge inspection. The growth of the crack was most likely due to stress corrosion. It's one year since part of a motorway bridge outside Genoa collapsed, as cars and lorries sped across it. Full story: sc.mp/26b9f The bridge connected two major cities of Ohio and West Virginia, and provided direct access to their respective state capitals. A higher, not lower, factor of safety should have been used for this bridge. If the piers shifted, the towers would be out of alignment, inducing a sag in the cables. The format categorizes the superstructure, the substructure, and the deck of the bridge into a set range of values. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. Plagued by the collapse of travel amid the coronavirus pandemic, arrivals to Hong Kong plummeted nearly 94 per cent year on year in 2020 to just 3.57 … Rocker towers were hinged at the bases to accommodate thermal deformations. Design features also indicated that the towers were protected from possible contact with a vehicle. The construction of the Point Pleasant Bridge was undertaken with the adoption of the latest technologies and new construction materials of the time. However, certain characteristics suggested the cause of the failure of the material. A Cathay spokeswoman said its aircraft was "slightly damaged" but would not comment on whether the home carrier will seek compensation from the airport authorities. Beyond the Headlines: How will Joe Biden change US policy in the Middle East? All affected passengers had left Hong Kong by Monday morning on alternative flight arrangements, she added. Also, the bridge was not designed with a sufficient number of redundancies. One opinion cited evidence for fatigue stress, whereas another one explained the cause as a combination of stress corrosion and corrosion fatigue. College of Civil Engineering, Fuzhou University, Fuzhou, China. The eyebar would still be vulnerable to failure even if the resulting stress did not exceed the yield strength of the material. After the vehicle passed, the connection would respond in compression to return to its original static dead load. Since then, the design load has been increased to the heavier AASHTO HS-20. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. What are the Installations Required in a Tunnel? Beyond the Headlines: will Azerbaijan's victory in Nagorno-Karabakh lead to lasting peace? Hong Kong-Zhuhai-Macao Bridge breakwater design scientific, reasonable and safe, says top gov’t official by Kris Cheng 10:59, 10 April 2018 22:01, 31 March 2020 Print On 15 th December 1967, the Point Pleasant Bridge collapsed due to heavy traffic on the bridge. Three vehicles were caught in the bridge collapse, according to the prosecutor. This sag would change the load distribution throughout the structure. The system of the eyebar consisted of two force bar members with rounded eyes at each end; the anchorage system consisted of reinforced concrete troughs filled with concrete; the towers were constructed on octagon-shaped piles of reinforced concrete. On 15th December 1967, the Point Pleasant Bridge collapsed due to heavy traffic on the bridge. The cause of the fatigue stress was the cycling loading applied on the bridge over the four decades. Plagued by the collapse of travel amid the coronavirus pandemic, arrivals to Hong Kong plummeted nearly 94 per cent year on year in 2020 to just 3.57 million, the lowest number on record for the once-mighty tourism hub.The provisional numbers, published by the Hong Kong Tourism Board on Friday, marked a precipitous drop from the 55.9 million people welcomed in 2019, a year in which … Beyond the Headlines: how will the US election play out? Also, the overall redundancy of the structure was poor. The bridge was designed using the deflection theory. Bridge Collapses in Taiwan; Oil Truck Plunges Moments Away From Crossing Several fishing boat workers were among at least a dozen people injured when the bridge… 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. On the night of 6 th November, a strong storm blew in the river where Tacoma Narrows Bridge was located. Testing showed that as the environmental temperatures decreased, the material was more susceptible to fracture. The other factor was the low temperature that on the day of the collapse, was near to freezing temperature. 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. The following points describe the key lessons from the failure of the Point Pleasant Bridge: A total of 46 people died due to the collapse of the Point Pleasant Bridge. Stress concentration and fatigue can be a dangerous combination to cause the failure of a bridge. Point Pleasant Bridge, also known as Silver Bridge, was constructed over the Ohio River to provide the crossing for highway number-35 of the United States of America. This oscillation caused fatigue stress in the member and could, over time, lead to failure. Once all the survivors had been rescued, and vehicles had been recovered, the operations shifted towards the removal of the collapsed structure. A different theory of the collapse found support in the metallurgical aspects of the eyebar chains and the consequence of both loading and the environment on the steel. In Taiwan, a huge 140 meter (459 feet) bridge collapsed in October of 2019, the event is known as the “Taiwan Bridge Collapse”. The two predominant factors were the application of tensile stress and the attack of pollutants on the steel. The evidence supporting failure by fatigue stress was based on changes in the live loads of the structure, which changed the orientation of the eyebars. It was wide enough to provide an air space for pollutants to attack the steel. The stresses that occurred during the collapse were less than the maximum stresses identified in the design. As the loads redistributed in the eyebar chain, the eyebar heads and the connecting pins would rotate. Key features of the Point Pleasant Bridge are described below: On a cold winter evening, the bridge suddenly collapsed due to the failure of the connection between the eyebar to the first joint on the north side of the bridge. You will receive a link and will create a new password via email. When the bridge was designed, the loading was based on the American Association of State Highway and Transportation Officials (AASHTO) H-15 specifications for a 15-ton truck with 106 kN on the rear axle and 27 kN on the front axle. Become VIP Member. TAIPEI: Taiwanese rescuers on Thursday (Oct 3) retrieved the body of the last missing person killed when a bridge collapsed two days ago, smashing onto fishing boats moored underneath. The bridge was constructed as a continuous truss between anchorages. The narrow gap between the eyebar and the connecting pin made the problem worse. It was also found that the eyebar was affected by the atmospheric conditions. There were two main contractors who were awarded the work. Hong Kong's rule of law has been pushed to the "brink of total collapse" after more than five months of protests, police have warned. Further, no testing methods were developed to measure the strength of large eyebar chains. Officials: Multiple Deaths After Bridge Collapse Associated Press. "No passengers or crew members were on the air bridge at the time. The twitterverse is showing the damage done at Hong Kong airport in a double airbridge collapse early last night. This center works to identify inspection methods through the use of technology that includes laser measurement, monitoring systems, and ultrasonic tests. Point Pleasant Bridge Disaster: Collapse of the Eyebar-Chain Suspension Bridge, Mackinac Bridge: Construction of the Most Aerodynamically Stable Suspension Bridge. Comments ( 0 ) Top Stories It first verified with the military that no airplanes had passed through the vicinity at the time of the collapse. 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. Six people were missing after a bridge in Taiwan collapsed. Live loads produced by a heavy vehicle would cause the hole in the eyebar to be placed in tension. The tensile stress came from traffic loads and thermal effects. It was possible for these forces to exceed the available resistance. The center span broke and flipped over into the water below, carrying 64 people from the roadway. Terrifying moment massive bridge suddenly collapses in a Chinese city 'due to severe flooding', sending cars into a raging river. The next morning, the bridge authorities closed the bridge for traffic after noticing that the bridge was undergoing severe undulating motions. This adjustment would cause a sliding friction to occur rather than a rolling friction. Thus, as soon as the tower toppled over, all the spans of the bridge collapsed because it was constructed as a continuous truss between anchorages. Beyond the Headlines: will vaccines help us return to normal in 2021? The construction of the bridge started in 1920 and completed in 1928. Lost your password? A 140-meter (459-foot) bridge has collapsed in northeast Taiwan, sending an oil tanker in the water and killing at least two people in fishing boats below. HONG KONG // Hong Kong authorities said they had launched an investigation after an air bridge collapsed at the city's airport, ripping the door off a Cathay Pacific plane and injuring a technician. The reaction most prevalent to the cause of the collapse was found in the eyebar chains and pins. The collapse prognosis of the bridge under a subsequent strong ground motion is then performed based on the updated model. Towers of the bridge were supported on the rockers. Beyond the Headlines: Stories from 2020 of Covid-19 and beyond. After the collapse of the Point Pleasant bridge, the President of the United States created a task force on bridge safety. The Hong Kong–Zhuhai–Macau Bridge (HZMB) is a 55-kilometre (34 mi) bridge–tunnel system consisting of a series of three cable-stayed bridges, an undersea tunnel, and four artificial islands.It is both the longest sea crossing and the longest open-sea fixed link in the world. 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