At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of labor and material. A very resource efficient alternative construction method called “Pneumatic Forming of Hardened Concrete (PFHC)” was invented at TU Wien by Dr. Benjamin Kromoser and Prof. Johann Kollegger at the Institute of Structural Engineering.
A simple air cushion and additional post-tensioning tendons transform a flat concrete plate into a double curved shell. Thus, the complicated spatially curved formwork and the framework are redundant.
The Austrian Federal Railways Infrastructure (ÖBB Infrastruktur) are currently building a first test construction on a scale of 1:2 in Carinthia, in the south of Austria, which will later serve as event canopy.
The “Pneumatic forming of hardened concrete” construction method
The functioning of the construction method is comparatively easy: At first a flat concrete plate with wedge-shaped outlets is casted. After the concrete is hardened, the air cushion placed underneath the plate is inflated and the post-tensioning tendons at the circumference are tensioned until the final form is reached.
Glass fiber reinforced plastic rods used as reinforcement absorb the occurring strains in the concrete plate. If the flat plate is produced with high accuracy, the construction method allows to build very precise concrete shells. The method also saves up to 50 percent of the concrete as well as 65 percent of the necessary reinforcement steel.
ÖBB test dome as event canopy
The test dome, built on behalf of the ÖBB Infrastruktur, has a length of 26.5 m, a width of 19.1 m and a height of 4.2 m. It will be used it to improve the construction technique for a first large application on a deer pass over the twin-track railway line “Koralmbahn” in 2017. Recently, the transformation process of the test dome was successfully finished, weighing 80 t and lifted with only 20-22 millibar from the flat plate to the spatially curved shell. The very smooth surface results from a sophisticated geometry optimization.
“We could improve the construction method once again decisively during the preparation of the project for this first application”, explains Dr. Benjamin Kromoser. In the next work steps, an additional concrete layer will be applied and some areas will be cut away. The final building can already be used for events in summer 2017.
Client: ÖBB Infrastruktur AG
Design and static calculations: TU Wien and Öhlinger + Partner Ziviltechniker Ges.m.b.H.
Controlling engineers: ZKP ZT GmbH
Executing firm: Kostmann GesmbH
Picture download: https://www.tuwien.ac.at/dle/pr/aktuelles/downloads/2017/betonschale
DI Dr. Benjamin Kromoser
Institut für Tragkonstruktionen
Karlsplatz 13/ E212-2, 1040 Wien
Dr. Florian Aigner | Technische Universität Wien
Smart buildings through innovative membrane roofs and façades
31.08.2017 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP
Concrete from wood
05.07.2017 | Schweizerischer Nationalfonds SNF
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses