The Metropol Parasols will be the new centerpiece of Plaza de la Encarnación in Seville. As well as being an eye-catching work of art, the mushroom-like structures are also playing host to some pioneering construction techniques, with even the load-bearing structural components consisting of finely-wrought laminated veneer lumber beams.
With mechanical joining methods ruled out for structural reasons, the beams are instead joined together by means of glued-in threaded rods. However, the high temperatures and relentless sunshine of a typical Seville summer could pose a significant challenge to the adhesive, in the worse-case it loses its ability to hold the components together.
The type of adhesive used in Seville is designed to withstand temperatures of up to 60 degrees, so researchers from the Fraunhofer Institute for Wood Research WKI have been working on behalf of the building inspection authorities to determine how close the thermal load is likely to come to this limit. “We ascertained the temperatures that might occur at the site and used simulations to determine the temperature this would trigger within the construction materials,” explains Dirk Kruse, head of department at WKI. “Our results revealed that the temperatures in the adhesive could potentially reach almost 60 degrees, which is obviously too close to the limit for comfort.” Subsequent tests carried out on three specimen components in a climate chamber confirmed their findings, giving rise to a stark choice: either the adhesive would have to be improved, or the building inspection authorities would be forced to bring building work to a halt. Fortunately, there is a method of improving the adhesive's resistance to high temperatures, namely by “tempering” the structural components: “Once the components have been glued in place, they are heated up again,” Kruse continues. “This causes post-curing reactions to occur.” And the result? The adhesive is less likely to take on a liquid form and maintains its stability up to a temperature of 70 degrees. This gives a safety margin over and above the thermal stress that is actually expected to occur, which means that the building work can now be continued as planned and Seville will soon be featuring a brand new landmark.
“These are the kinds of solutions that will help to firmly anchor adhesive technology within the building industry,” Kruse states. While adhesive bonding is widely used in the aircraft industry, the use of adhesion for structural applications in the building industry is still in its infancy. Yet the method opens up a whole new wealth of possibilities for architects.
Dirk Kruse | Fraunhofer Gesellschaft
Modular storage tank for tight spaces
16.03.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
Smart homes will “LISTEN” to your voice
17.01.2017 | EML European Media Laboratory GmbH
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
Two researchers at Heidelberg University have developed a model system that enables a better understanding of the processes in a quantum-physical experiment...
Glaciers might seem rather inhospitable environments. However, they are home to a diverse and vibrant microbial community. It’s becoming increasingly clear that they play a bigger role in the carbon cycle than previously thought.
A new study, now published in the journal Nature Geoscience, shows how microbial communities in melting glaciers contribute to the Earth’s carbon cycle, a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
21.04.2017 | Physics and Astronomy
21.04.2017 | Health and Medicine
21.04.2017 | Physics and Astronomy