Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Latest satellite technology to help monitor large bridges


University experts have studied one of Britain’s most prominent landmarks in a bid to discover how the latest satellite technology could make bridges last longer and remain safe for motorists, pedestrians and cyclists.

The team from The University of Nottingham’s world-leading Institute of Engineering Surveying and Space Geodesy and Brunel University spent 48 hours on the Forth Road Bridge, which links the Lothians to Fife in Scotland, to find out how the bridge’s movements were affected by both heavy traffic and other environmental factors like the wind.

Their findings could enable engineers to assess whether bridges that were built decades ago are still safe to be used by traffic and if they need to be modified to prolong their lifespan.

The structure of a bridge is designed to move fractionally when a load, such as the weight of traffic or a gust of wind, is applied. Engineers can use precise measurements and calculations to build a computer model showing how bridges should be moving under safe and normal circumstances.

However, over the last few decades traffic on Britain’s road has increased dramatically, putting a strain on bridges that were never designed to cope with such heavy loads. This loading increase could cause bridges to move significantly more, which could have potentially serious consequences for the safety of the structure.

The collaborative project is aimed at giving the Forth Estuary Transport Authority, which maintains the Forth Road Bridge, a clearer picture of how the bridge is coping with these increased loads by accurately measuring how much it is moving by using small GPS receivers. The techniques and technology are capable of measuring the 3-D positions of the GPS antennas to an accuracy of a few millimetres and at a rate of 10 hertz.

A network of seven receivers were placed at specific points on the bridge, along with two off-bridge reference receivers, relative to which the bridge receivers were positioned. Using satellite signals, the academics were able to continually plot the position of the receivers, which allowed them to build up a detailed picture of how the bridge was moving.

Dr Gethin Roberts, of the IESSG, said: “At about 1am on the second day we were there, we stopped the traffic and had two 40 tonne lorries drive over the bridge in different formations to see how the bridge behaved under their load.

“Interestingly, the biggest movement from the bridge came not from the lorry but from the build up of traffic waiting to cross behind it.

“Luckily, and completely coincidentally, on separate occasions we were also able to observe a 100 tonne lorry crossing the bridge and how it behaved in gusts of winds up to 60 mph.”

When the Forth Road Bridge opened in 1964 it was the longest suspension bridge in the world outside of the USA. Traffic has risen steadily from four million vehicles to more than 23 million by 2002. In 1964, the heaviest commercial vehicles weighed just 24 tonnes but, due to the increasing weight and number of heavy goods vehicles on UK roads, the traffic loading experienced on the bridge is double that expected by engineers who designed the structure at the end of the 1950s. Consequently, a large capital programme to strengthen the bridge to take these increased loads is continuing.

Dr Chris Brown from the School of Engineering and Design at Brunel University said: “The GPS network on the bridge has enabled us to obtain really good quality data over prolonged periods.

“Working in collaboration with consulting engineers at WA Fairhurst and Partners in Glasgow, we have already been able to establish from their estimate of the performance of the structure and our measurements that the bridge is moving roughly in line with expectations. We will now also be able to carry out more detailed calculations to show how wind and other environmental factors affect the behaviour of this particular bridge.”

The methods outlined by the study could offer a more permanent monitoring system that would allow engineers to assess the way in which bridges are moving over a long period of time under different loads and to identify even small changes in performance. This could help engineers to decide what maintenance works are needed to ensure they remain safe.

The research follows on from a larger project entitled A Remote Bridge Health Monitoring System Using Computational Simulation and GPS Sensor Data, funded with £310,000 from the Engineering and Physical Sciences Research Council. As well as the data collected from the Forth Road Bridge, the Nottingham academics carried out similar investigations at the Wilford Suspension Bridge in Nottingham and collaborated with Brunel University on the Millennium Bridge in London and the Humber Bridge in Hull.

The IESSG is a European Union-funded Marie Curie Training Centre, the only one in Europe in the field of satellite positioning technology. The data from the research project will also be used by research students visiting the institute from other parts of Europe.

Dr Roberts attended a workshop held in Hong Kong from June 7 to 9 on the subject of using GPS to monitor large bridges. The workshop was the first of its kind, and organised by Leica Geosystems. The three-day event saw presentations about a variety of international work, including the work underway at The University of Nottingham and Brunel University. Attended mainly by Asian engineers, presentations were given by Dr Roberts on the work carried out on the Humber, Forth and Millennium Bridges in the UK, as well as presentations by others on active systems based on GPS built into the Tsing Ma Hong Kong as well as other bridges in China.

Emma Thorne | alfa

All articles from Information Technology >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: New 3-D wiring technique brings scalable quantum computers closer to reality

Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.

"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...

Im Focus: Scientists develop a semiconductor nanocomposite material that moves in response to light

In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.

A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...

Im Focus: Diamonds aren't forever: Sandia, Harvard team create first quantum computer bridge

By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.

"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...

Im Focus: New Products - Highlights of COMPAMED 2016

COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.

In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...

Im Focus: Ultra-thin ferroelectric material for next-generation electronics

'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.

Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...

All Focus news of the innovation-report >>>



Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

Agricultural Trade Developments and Potentials in Central Asia and the South Caucasus

14.10.2016 | Event News

World Health Summit – Day Three: A Call to Action

12.10.2016 | Event News

Latest News

Resolving the mystery of preeclampsia

21.10.2016 | Health and Medicine

Stanford researchers create new special-purpose computer that may someday save us billions

21.10.2016 | Information Technology

From ancient fossils to future cars

21.10.2016 | Materials Sciences

More VideoLinks >>>