hong kong bridge collapse

Each bridge was to be inspected every two years. However, certain characteristics suggested the cause of the failure of the material. In Taiwan, a huge 140 meter (459 feet) bridge collapsed in October of 2019, the event is known as the “Taiwan Bridge Collapse”. Rocker towers were hinged at the bases to accommodate thermal deformations. Also, the company lacked technical justification for the use of low safety factors against ultimate and yielding strength. 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. Collapse of the Tacoma Narrows Bridge. Some of them are discussed below: The U.S. Army Ordnance Group ruled out the possibilities of explosions and impacts. 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 construction of the Point Pleasant Bridge was undertaken with the adoption of the latest technologies and new construction materials of the time. Collapse of the Tacoma Narrows Bridge: A Case Study, Petra Jordan: A World Heritage Site Under Risk. The other factor was the low temperature that on the day of the collapse, was near to freezing temperature. Calculations showed a 3% loss of steel due to this degradation of material. All affected passengers had left Hong Kong by Monday morning on alternative flight arrangements, she added. Beyond the Headlines: Stories from 2020 of Covid-19 and beyond. The reaction most prevalent to the cause of the collapse was found in the eyebar chains and pins. The stresses that occurred during the collapse were less than the maximum stresses identified in the design. 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 coal-burning factories and locomotives, and automotive pollution provided many airborne chemicals that could attack steel. Further verification showed that the piers were in proper orientation. The American bridge company didn’t make its calculations and test results public. 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. In 1968, the U.S. federal government enacted a procedure for national bridge inspection. Design features also indicated that the towers were protected from possible contact with a vehicle. The next morning, the bridge authorities closed the bridge for traffic after noticing that the bridge was undergoing severe undulating motions. Also, the bridge was not designed with a sufficient number of redundancies. The connection at the eyebar was not redundant because it consisted of only two pairs of eyebars. This change of symmetry caused uneven loads across the suspension spans. The rear bridge then smashed into the head bridge, which was connected to the first class cabin, ripping a door off the A330 aircraft. Further, no testing methods were developed to measure the strength of large eyebar chains. Terrifying moment massive bridge suddenly collapses in a Chinese city 'due to severe flooding', sending cars into a raging river. At least three fishing boats were crushed and a fuel truck plunged into the water. The traffic on the bridge was crawling. The Point Pleasant Bridge was a suspension bridge. It was the second eyebar suspension bridge consisting of heat-treated eyebars, and a rocking base was constructed on the Ohio river. As the loads redistributed in the eyebar chain, the eyebar heads and the connecting pins would rotate. Tests showed that the eyebar pin connection was susceptible to pitting corrosion due to water, hydrogen sulfide, and salt. 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. A team assembled to look into the accident on the multibillion-dollar Hong Kong-Zhuhai-Macau bridge which killed two workers and injured three … It's one year since part of a motorway bridge outside Genoa collapsed, as cars and lorries sped across it. Double airbridge collapse at Hong Kong damages CX A330. 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. What are the Installations Required in a Tunnel? Before this law, bridges were not consistently inspected. 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 … 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. Officials: Multiple Deaths After Bridge Collapse Associated Press. The exposed surface was thus left open to natural elements and created a built-in weakness. UP NEXT. There were two main contractors who were awarded the work. Beyond the Headlines: how will the US election play out? This theory implied that the pin cap would become responsible for resisting the lateral forces within the connection. A towering bridge over a bay in eastern Taiwan has collapsed sending an oil tanker truck falling onto boats in the water below. 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. 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. The works related to the pier foundation were carried out by the general contracting company of Pittsburgh, and the superstructure was constructed by the American bridge company of Pittsburgh. Three vehicles were caught in the bridge collapse, according to the prosecutor. 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. It was wide enough to provide an air space for pollutants to attack the steel. The narrow gap between the eyebar and the connecting pin made the problem worse. 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. The new procedure provided exact protocols to be followed, and inspectors were required to be evaluated and certified by the Federal Highway Administration (FHA). 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. After the collapse of the Point Pleasant bridge, the President of the United States created a task force on bridge safety. The design of the bridge was unique because it had high tension eyebar chains, rocker towers, and a unique anchorage system. They reported no holes around the piers or any signs of damage to the piers. 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. 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. 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 traffic on the bridge was crawling. The importance of this standardization is to allow the accurate rating and comparison of the bridges in the inventory. It was the holiday season and people were shuttling back and forth between the two cities via the bridge. 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 stress increase was considered in terms of an increased percentage of the original live loads. On 15th December 1967, the Point Pleasant Bridge collapsed due to heavy traffic on the bridge. When around three big trucks and 72 cars came to a halt, the bridge began to sway wildly and ultimately collapsed. 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 Reduced factors of safety, 2 against ultimate strength and 1.5 against yielding, were used in the original bridge design. The U.S. Bureau of Standards noted the fracture pattern on the eyebar. When the Point Pleasant Bridge was being constructed, the knowledge of long-term fatigue combined with the crevice corrosion was limited. Eyebar chain greatly improved the bridge’s stiffness with less steel. The brittleness of the steel connection, and thus its susceptibility to sudden fracture, was enhanced by two factors. A technician who was trapped in the falling bridge at the time was injured. Scour was eliminated because of the observations of the divers at the scene. The two predominant factors were the application of tensile stress and the attack of pollutants on the steel. The center span broke and flipped over into the water below, carrying 64 people from the roadway. 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. The bridge collapsed about 9:30 a.m. in Nanfangao, a tiny but often-crowded Pacific coast fishing village. Plagued by the collapse of travel amid the coronavirus pandemic, arrivals to Hong Kong plummeted nearly 94% year on … The combination of uneven loading and changes in stress levels caused the pins to shift. These tests concluded that the live loads were not excessive and that the loading caused some vibrations in the individual members of the structure. Live loads produced by a heavy vehicle would cause the hole in the eyebar to be placed in tension. All Rights Reserved. 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. Testing showed that as the environmental temperatures decreased, the material was more susceptible to fracture. Beyond the Headlines: will vaccines help us return to normal in 2021? This failure caused the Ohio tower to fall and resulted in the collapse of the West Virginia tower. The reassembly of the bridge showed evidence of a cleavage fracture in the eyebar on the Ohio side of the truss. The collapse prognosis of the bridge under a subsequent strong ground motion is then performed based on the updated model. The experts investigated many possible causes of the collapse. 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. He said the technician's condition was stable. Lost your password? This sag would change the load distribution throughout the structure. It was the holiday season and people were shuttling back and forth between the two cities via the bridge. A sidewalk and a vehicle lane on the south side, instead of two vehicle lanes on the north end, caused this lack of symmetry. After the vehicle passed, the connection would respond in compression to return to its original static dead load. 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. However, it was not large enough to allow engineers to inspect the connection. The hardness was not uniform throughout the thickness of the material. VIP members get additional benefits. Six people were missing after a bridge in Taiwan collapsed. The bridge connected two major cities of Ohio and West Virginia, and provided direct access to their respective state capitals. The cross-sections of the eyebar revealed a number of small cracks, about the size of pinholes. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China. 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. 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… Point Pleasant Bridge Disaster: Collapse of the Eyebar-Chain Suspension Bridge, Mackinac Bridge: Construction of the Most Aerodynamically Stable Suspension Bridge. 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. This limit contrasted with higher factors of safety, 2.75 and 1.75 respectively, for an alternate conventional suspension design. One opinion cited evidence for fatigue stress, whereas another one explained the cause as a combination of stress corrosion and corrosion fatigue. The cause of the fatigue stress was the cycling loading applied on the bridge over the four decades. Full story: sc.mp/26b9f 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 construction of the bridge started in 1920 and completed in 1928. Since then, the design load has been increased to the heavier AASHTO HS-20. Beyond the Headlines: will Azerbaijan's victory in Nagorno-Karabakh lead to lasting peace? A total of 46 people lost their lives due to this accident. College of Civil Engineering, Fuzhou University, Fuzhou, China. Beyond the Headlines: How will Joe Biden change US policy in the Middle East? We are investigating the cause of the incident," a spokesman from the Hong Kong Airport Authority said. 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. However, the steel used was of unusually high strength, and its properties were not well known. Beyond The Headlines: why superstorms are the new normal. 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. 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. This center works to identify inspection methods through the use of technology that includes laser measurement, monitoring systems, and ultrasonic tests. 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. The bridge was designed using the deflection theory. 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. Become VIP Member. Each joint contained two eyebars that connected to the suspension chains. 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.

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