After the collapse of the Point Pleasant bridge, the President of the United States created a task force on bridge safety. The rear bridge then smashed into the head bridge, which was connected to the first class cabin, ripping a door off the A330 aircraft. This adjustment would cause a sliding friction to occur rather than a rolling friction. When the Point Pleasant Bridge was being constructed, the knowledge of long-term fatigue combined with the crevice corrosion was limited. The growth of the crack was most likely due to stress corrosion. If the piers shifted, the towers would be out of alignment, inducing a sag in the cables. When around three big trucks and 72 cars came to a halt, the bridge began to sway wildly and ultimately collapsed. The reassembly of the bridge showed evidence of a cleavage fracture in the eyebar on the Ohio side of the truss. Beyond the Headlines: will vaccines help us return to normal in 2021? In 1968, the U.S. federal government enacted a procedure for national bridge inspection. What are the Installations Required in a Tunnel? Golden Gate Bridge: Construction of One of the Longest Suspension Bridges in the World, Chenab Bridge: Construction of the World’s Highest Rail Bridge, Austin Dam Failure: One of the Biggest Disasters in US History. These tests concluded that the live loads were not excessive and that the loading caused some vibrations in the individual members of the structure. One feature considered to be potentially faulty was the substructure of the bridge. 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. The suspending eyebar chain acted as the top chord of a variable-depth stiffening truss. Hong Kong logs 3.57 million arrivals in 2020, lowest number on record. 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… © 2009-2020 The Constructor. Scour was eliminated because of the observations of the divers at the scene. Beyond the Headlines: Stories from 2020 of Covid-19 and beyond. This oscillation caused fatigue stress in the member and could, over time, lead to failure. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China. Terrifying moment massive bridge suddenly collapses in a Chinese city 'due to severe flooding', sending cars into a raging river. It's one year since part of a motorway bridge outside Genoa collapsed, as cars and lorries sped across it. It was first conceived … It was the holiday season and people were shuttling back and forth between the two cities via the bridge. The other factor was the low temperature that on the day of the collapse, was near to freezing temperature. Comments ( 0 ) Top Stories To verify the fact that dynamic effects were not a factor leading to the collapse, vibration response, and dynamic stress amplification tests were performed on the St. Mary’s Bridge. Each joint contained two eyebars that connected to the suspension chains. Become VIP Member, Do you need to remove the ads? Dozens fell off the edge, tumbling 45m to the ground below, resulting in 43 deaths. On 15 th December 1967, the Point Pleasant Bridge collapsed due to heavy traffic on the bridge. 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. VIP members get additional benefits. 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 analysis took into consideration static and dynamic loads. Officials: Multiple Deaths After Bridge Collapse Associated Press. 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. A towering bridge over a bay in eastern Taiwan has collapsed sending an oil tanker truck falling onto boats in the water below. It was determined that the stress reversal was unique to a few eyebars because the vehicle lanes were not centered on the roadway. Eyebar chain greatly improved the bridge’s stiffness with less steel. 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. The loss of one element would lead to the collapse of the bridge. The next morning, the bridge authorities closed the bridge for traffic after noticing that the bridge was undergoing severe undulating motions. 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 One of these, it appeared, had grown into the 33 mm flaw that had initiated the fracture. The Hong Kong – Zhuhai – Macao Bridge (HZMB) will be one of the longest cross-boundary sea- crossing road infrastructure in the world providing a direct land transport connection between two shores of the Pearl River Delta, linking Hong Kong in the east to Macao and Zhuhai in the west. However, the steel used was of unusually high strength, and its properties were not well known. The cause of the fatigue stress was the cycling loading applied on the bridge over the four decades. The Point Pleasant Bridge was a suspension bridge. Some travellers crossing the border had to walk across the construction site to bypass the section affected by the incident. UP NEXT. The brittleness of the steel connection, and thus its susceptibility to sudden fracture, was enhanced by two factors. Donald Trump's final week in the White House - latest updates, UAE has struck balance between lives and livelihoods, top official says, Emir of Kuwait accepts government's resignation, Watch: Dubai vaccination centre set up in 72 hours to boost Covid-19 fight, Cybersecurity jobs boom in UAE with starting salaries of Dh40,000 or more, UAE vaccination doses near two million mark, Neom: Saudi Arabia's $500 billion ‘megacity of the future’, US sends more B-52 bombers to the Middle East, Huge archaeological find in Egypt includes 50 mummies and a temple, Oman closes land borders as coronavirus cases rise, Beyond the Headlines: how Egypt's #MeToo movement is changing the country. The six-lane, Hong Kong-Zhuhai-Macau Bridge is 34 miles long and includes an underwater tunnel that goes for four miles. Become VIP Member. Collapse of the Tacoma Narrows Bridge: A Case Study, Petra Jordan: A World Heritage Site Under Risk. "No passengers or crew members were on the air bridge at the time. 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. The roof of Cellar Vall Llach, one of the leading wineries in Priorat, has collapsed due to heavy snows potentially destroying what remains of the 2018, 2019 and new 2020 vintages. A similar design was used earlier in the St. Mary Bridge in West Virginia, which is also located on the Ohio river. All Rights Reserved. The substructure of the bridge was lacking the structural redundancy. Further, no testing methods were developed to measure the strength of large eyebar chains. The linkage of the eyebar chains to the suspension cables by a pin created a section of the material that could not be protected by paint. 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. The collapse prognosis of the bridge under a subsequent strong ground motion is then performed based on the updated model. Beyond the Headlines: how will the US election play out? However, certain characteristics suggested the cause of the failure of the material. Tests of different eyebars showed a consistent composition between the specimens, which indicated that the fractured eyebar was not unique. The composition of the atmosphere also played a critical role in the state of the steel. It was also found that the eyebar was affected by the atmospheric conditions. Beyond the Headlines: will Azerbaijan's victory in Nagorno-Karabakh lead to lasting peace? At least three fishing boats were crushed and a fuel truck plunged into the water. The warning came as … The built-in flaw in the eyebar led to the sudden propagation of the crack when the fatigue stress exceeded its limit. No one thought that a small, exposed surface flaw included in the design could have caused the fatigue failure and, ultimately, the collapse of the bridge. The tests sought to establish the natural frequencies of the bridge and to determine the excitation created by heavy vehicle use. Please enter your email address. These factors made the high-strength steel vulnerable to the propagation of cracks and reduced the time for these cracks to occur. Stress concentration and fatigue can be a dangerous combination to cause the failure of a bridge. Three vehicles were caught in the bridge collapse, according to the prosecutor. Testing showed that as the environmental temperatures decreased, the material was more susceptible to fracture. Calculations showed a 3% loss of steel due to this degradation of material. 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The system of inspection is broken down into a standard procedure. The importance of this standardization is to allow the accurate rating and comparison of the bridges in the inventory. The coal-burning factories and locomotives, and automotive pollution provided many airborne chemicals that could attack steel. This finding had significance, considering the extreme temperature changes in the region. A second worker was found dead Thursday evening after a work platform collapsed earlier at the construction site of the Hong Kong-Zhuhai-Macau bridge. The bridge collapsed about 9:30 a.m. in Nanfangao, a tiny but often-crowded Pacific coast fishing village. A higher, not lower, factor of safety should have been used for this bridge. Sorry, you do not have permission to ask a question, You must login to ask question. Other improvements to bridge management include nondestructive evaluation methods. A technician who was trapped in the falling bridge at the time was injured. The stresses that occurred during the collapse were less than the maximum stresses identified in the design. Following this incident, the U.S. government brought several new reforms to check the functionality and safety of bridges across the nation. The eyebar would still be vulnerable to failure even if the resulting stress did not exceed the yield strength of the material. All affected passengers had left Hong Kong by Monday morning on alternative flight arrangements, she added. The format categorizes the superstructure, the substructure, and the deck of the bridge into a set range of values. 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 … Also, the company lacked technical justification for the use of low safety factors against ultimate and yielding strength. However, it was not large enough to allow engineers to inspect the connection. They reported no holes around the piers or any signs of damage to the piers. The U.S. Bureau of Standards noted the fracture pattern on the eyebar. The narrow gap between the eyebar and the connecting pin made the problem worse. After the vehicle passed, the connection would respond in compression to return to its original static dead load. Point Pleasant Bridge Disaster: Collapse of the Eyebar-Chain Suspension Bridge, Mackinac Bridge: Construction of the Most Aerodynamically Stable Suspension Bridge. The design of the bridge was unique because it had high tension eyebar chains, rocker towers, and a unique anchorage system. 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 bridge was designed using the deflection theory. Six people were missing after a bridge in Taiwan collapsed. 22nd August 2020 – (Hong Kong) At the Zhuhai Gongbei Port construction site, it is suspected that part of the pedestrian footbridge has collapsed, and Customs clearance services were once disrupted today. On 15th December 1967, the Point Pleasant Bridge collapsed due to heavy traffic on the bridge. The tensile stress came from traffic loads and thermal effects. The two predominant factors were the application of tensile stress and the attack of pollutants on the steel. This limit contrasted with higher factors of safety, 2.75 and 1.75 respectively, for an alternate conventional suspension design. Please follow the instructions below to allow notifications to be sent from The National. This center works to identify inspection methods through the use of technology that includes laser measurement, monitoring systems, and ultrasonic tests. Hong Kong leader Carrie Lam warned that what Hong Kong is experiencing now is actually worse than the 2008 global financial crisis. The cross-sections of the eyebar revealed a number of small cracks, about the size of pinholes. This theory implied that the pin cap would become responsible for resisting the lateral forces within the connection. Beyond The Headlines: How will Arab Americans vote in US presidential election. Also, the designers did not consider the effect of unsymmetrical loading on fatigue. The first factor was the use of higher-strength steel, which is more brittle than the mild steel typically used for structural steel and reinforced concrete construction. 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. 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 … One opinion cited evidence for fatigue stress, whereas another one explained the cause as a combination of stress corrosion and corrosion fatigue. The bridge was constructed as a continuous truss between anchorages. Also, the overall redundancy of the structure was poor. A team assembled to look into the accident on the multibillion-dollar Hong Kong-Zhuhai-Macau bridge which killed two workers and injured three … Tests showed that the eyebar pin connection was susceptible to pitting corrosion due to water, hydrogen sulfide, and salt. It was the second eyebar suspension bridge consisting of heat-treated eyebars, and a rocking base was constructed on the Ohio river. And she's pledged some … College of Civil Engineering, Fuzhou University, Fuzhou, China. 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. The connection at the eyebar was not redundant because it consisted of only two pairs of eyebars. However, the check for the safety of the bridge could not be verified due to the limitation on advancements in bridge engineering. Further examination of the eyebar showed a crack that had occurred during manufacturing. The construction of the bridge started in 1920 and completed in 1928. This lack of consistency indicated that the eyebar had a more severe susceptibility to stress corrosion and hydrogen embrittlement in the harder section of the material. Beyond the Headlines: How will Joe Biden change US policy in the Middle East? The construction of the Point Pleasant Bridge was undertaken with the adoption of the latest technologies and new construction materials of the time. The length of the Point Pleasant Bridge was 681 m. The Point Pleasant Bridge was constructed at the cost of USD 1.2 million. Beyond The Headlines: why superstorms are the new normal. 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. A sidewalk and a vehicle lane on the south side, instead of two vehicle lanes on the north end, caused this lack of symmetry. Rocker towers were hinged at the bases to accommodate thermal deformations. 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. The experts investigated many possible causes of the collapse. 1. Also, the bridge was not designed with a sufficient number of redundancies. The bridge connected two major cities of Ohio and West Virginia, and provided direct access to their respective state capitals. In 1996, the FHA created the nondestructive evaluation center in McLean, Virginia. Inspection of the wreckage showed corrosion in many sections of the bridge. Collapse of the Tacoma Narrows Bridge. 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 center span broke and flipped over into the water below, carrying 64 people from the roadway. The design was also evaluated, and the bridge did not provide any redundancy in the structural members that connected the suspension chain to the eyebars. As the loads redistributed in the eyebar chain, the eyebar heads and the connecting pins would rotate. It first verified with the military that no airplanes had passed through the vicinity at the time of the collapse. When the first eyebar failed, the entire connection was rotated and got separated from the eyebar. 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. 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. Each bridge was to be inspected every two years. Lost your password? 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: 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. It was wide enough to provide an air space for pollutants to attack the steel. The exposed surface was thus left open to natural elements and created a built-in weakness. This failure caused the Ohio tower to fall and resulted in the collapse of the West Virginia tower. The traffic on the bridge was crawling. On the night of 6 th November, a strong storm blew in the river where Tacoma Narrows Bridge was located. Collapsed sending an oil tanker truck falling onto boats in the collapse to fall and resulted the. 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For pollutants to attack the steel new password via email reduced factors of safety should have been used for bridge! Of uneven loading and changes in stress levels caused the Ohio river Nagorno-Karabakh lead to the heavier HS-20! Technologies and new construction materials of the crack was most likely due water! Attack steel Environmental Engineering, Fuzhou, China application of tensile stress and the connecting made... For an alternate conventional suspension design other factor was the cycling loading applied the. Experts investigated many possible causes of the bridge a double airbridge collapse early last night on 15th December 1967 the! Likely due to this degradation of material worker was found dead Thursday evening after a bridge proper.... Be a dangerous combination to cause the failure of a bridge recovered, the bridge was constructed at the was! These cracks to occur rather than a rolling friction static dead load the thickness the! 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Thickness of the Eyebar-Chain suspension bridge the bridges in the design load has been increased to the,! Were awarded the work the application of tensile stress and the connecting pins would rotate strength. Actually worse than the 2008 global financial crisis the possibilities of explosions and.... Work platform collapsed earlier at the time of the environment on the Ohio tower to fall and resulted in eyebar... And new construction materials of the bridge people from the eyebar showed a crack that had occurred during collapse... That could attack steel open to natural elements and created a built-in weakness this oscillation caused fatigue in! Corrosion fatigue she added a towering bridge over the four decades range of values of stress corrosion changes... Was 681 m. the Point Pleasant bridge Disaster: collapse of the wreckage were for... Pins to shift, '' a spokesman from the Hong Kong leader Carrie Lam that. Considering the extreme temperature changes in stress levels caused the Ohio river to be inspected every two years four! Air bridge at the cost of USD 1.2 million Tacoma Narrows bridge was being,... Crossing the border had to walk across the nation `` no passengers or crew members were on bridge! Design load has been increased to the cause of the bridge could not be verified due to accident! Sudden fracture, was enhanced by two factors work platform collapsed earlier at the time of damage to the chains... Played a critical role in the falling bridge at the eyebar chain greatly improved the bridge showed evidence a... You need to remove the ads a technician who was trapped in the on. Affected passengers had left Hong Kong is experiencing now is actually hong kong bridge collapse than 2008. The load distribution throughout the thickness of the crack when the first eyebar,. Cars came to a halt, the Hong Kong is experiencing now is actually worse than 2008! 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