Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Building Stronger Bridges

23.04.2014

Structures lab fulfills private, public needs

It all comes down to bridging a gap.


Photo by Eric Landwehr

Graduate student Todd Pauly adjusts the instrumentation on the column as part of testing to determine whether self-consolidating concrete columns can be used in areas where earthquakes occur.

The J. Lohr Structures Laboratory helps companies develop new materials and products—self-consolidating concrete columns and pre-stress concrete bridge girders-- that bridge a physical gap. Many of those newly developed products are used in public works projects funded by federal, state and local governments, thus bridging a commercial gap.

The lab is the only facility of its kind in South Dakota, according to Nadim Wehbe, head of the South Dakota State University Civil and Environmental Engineering Department. Wehbe, who coordinated the lab’s development, has been recognized as a leader in the field, recently being named a fellow of both the Structural Engineering Institute and the American Concrete Institute.

Over the last decade, researchers have conducted structural testing on large- and full-scale test specimens for private companies and government entities. As one of eight universities in the Mountain-Plains Consortium Transportation Center Program, SDSU civil engineering faculty and graduate students work on solutions to transportation-related problems and evaluate structures that may be more cost-effective and durable.

Testing composite structures
The Vulcraft/Verco Group of Norfolk, Neb., a division of Nucor Corporation, has used the lab to research a wide range of steel joists, steel decks and cold-formed wall assemblies.

For a Nucor-funded project in fall 2008, structures lab graduate students and staff built cold-formed steel walls and a 20-foot steel joist floor, tested the structure and demolished it, all within a week, explained lab manager Zachary Gutzmer. This process was repeated for seven floor-and-wall setups.

The project’s goal was to determine how the type and placement of joists affected wall loading. The floor was loaded using an actuator, and strain gauges collected data on wall stress and its effect on building components.

Since then, Nucor has sponsored four research projects investigating various facets of concrete/cold-formed steel composite building components.

“Having a structures lab close by allows our engineers to view more of the testing and reduces our transportation costs,” explained Dave Samuelson, structural research engineer for new products and market development at Vulcraft/Verco Group.

“Nucor’s research partnership with SDSU during the past five years has allowed us to develop a greater understanding of the behavior of our new composite floor system,” Samuelson said. “Our partnership with SDSU has been a win-win situation.”

Evaluating bridge materials
Research at the structure lab also helps South Dakota companies develop transportation products, such as bridge girders, that are then used for public works projects.

In 2006, the lab evaluated the performance of six 40-foot prestressed concrete bridge girders, each weighing 18 tons. The research project was funded by the South Dakota Department of Transportation and the U.S. Department of Transportation through the Mountain Plains-Consortium and investigated the performance of self-consolidating concrete. Two precast concrete producers, Gage Brothers of Sioux Falls and Cretex of Rapid City, donated the girders made of coarse aggregates from their respective areas of the state.

Self-consolidating concrete, also known as self-leveling or self-compacting, does not require the use of a mechanical vibrator to distribute the concrete evenly. Tests showed that the self-consolidating girders performed equal to or better than conventional concrete girders, according to Wehbe. This research enabled the two companies to produce a new product which they could then sell to construct bridges on the state’s highways.

“We can combine both public and private interests into one project by engaging industry with vested interest in the research being done.” Wehbe said.

Collin Moriarty, engineering manager at Gage Brothers, says this coordinated effort provides local governments with better, more cost-effective structures.

Withstanding earthquakes, crashes
For a 2013 Mountain-Plains Consortium project, graduate student Todd Pauly determined that bridge columns made of self-consolidating concrete can be used in regions which experience earthquakes.

Last fall, graduate student Brett Tigges began evaluating the effectiveness of a concrete wall poured between two bridge columns in preventing bridge failure that might occur if a semi-truck crashed at high speed into the bridge column.

“This lab is a tremendous resource for hands-on research,” said Wehbe.

Through its collaboration with private and public entities, the work done at the structures lab will continue to improve the quality of buildings and bridges.

About the J. Lohr Structures Lab
Established in 2004, J. Lohr Structures Lab the facility has a 34-foot high bay space that is 90 feet long and 39 feet wide with a 4-foot thick reinforced concrete floor to accommodate large- and full-scale test specimens. The lab does research for private companies and government entities and is one of eight universities in the Mountain-Plains Consortium Transportation Center Program. For more information, contact lab manager Zachary Gutzmer at Zachary.gutzmer@sdstate.edu or call (605) 688-4999 or the SDSU Civil and Environmental Engineering Department at (605) 688-5427.

About South Dakota State University
Founded in 1881, South Dakota State University is the state’s Morrill Act land-grant institution as well as its largest, most comprehensive school of higher education. SDSU confers degrees from eight different colleges representing more than 175 majors, minors and specializations. The institution also offers 29 master’s degree programs, 13 Ph.D. and two professional programs.

The work of the university is carried out on a residential campus in Brookings, at sites in Sioux Falls, Pierre and Rapid City, and through Cooperative Extension offices and Agricultural Experiment Station research sites across the state.

Contact Information

nadim.wehbe@sdstate.edu
zachary.gutzmer@sdstate.edu

Nadim Wehbe | newswise
Further information:
http://www.sdstate.edu

More articles from Architecture and Construction:

nachricht NEST: building of the future is up and running
23.05.2016 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt

nachricht Designing buildings with a positive energy balance
18.03.2016 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH

All articles from Architecture and Construction >>>

The most recent press releases about innovation >>>

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

Im Focus: Worldwide Success of Tyrolean Wastewater Treatment Technology

A biological and energy-efficient process, developed and patented by the University of Innsbruck, converts nitrogen compounds in wastewater treatment facilities into harmless atmospheric nitrogen gas. This innovative technology is now being refined and marketed jointly with the United States’ DC Water and Sewer Authority (DC Water). The largest DEMON®-system in a wastewater treatment plant is currently being built in Washington, DC.

The DEMON®-system was developed and patented by the University of Innsbruck 11 years ago. Today this successful technology has been implemented in about 70...

Im Focus: Computational high-throughput screening finds hard magnets containing less rare earth elements

Permanent magnets are very important for technologies of the future like electromobility and renewable energy, and rare earth elements (REE) are necessary for their manufacture. The Fraunhofer Institute for Mechanics of Materials IWM in Freiburg, Germany, has now succeeded in identifying promising approaches and materials for new permanent magnets through use of an in-house simulation process based on high-throughput screening (HTS). The team was able to improve magnetic properties this way and at the same time replaced REE with elements that are less expensive and readily available. The results were published in the online technical journal “Scientific Reports”.

The starting point for IWM researchers Wolfgang Körner, Georg Krugel, and Christian Elsässer was a neodymium-iron-nitrogen compound based on a type of...

Im Focus: Atomic precision: technologies for the next-but-one generation of microchips

In the Beyond EUV project, the Fraunhofer Institutes for Laser Technology ILT in Aachen and for Applied Optics and Precision Engineering IOF in Jena are developing key technologies for the manufacture of a new generation of microchips using EUV radiation at a wavelength of 6.7 nm. The resulting structures are barely thicker than single atoms, and they make it possible to produce extremely integrated circuits for such items as wearables or mind-controlled prosthetic limbs.

In 1965 Gordon Moore formulated the law that came to be named after him, which states that the complexity of integrated circuits doubles every one to two...

Im Focus: Researchers demonstrate size quantization of Dirac fermions in graphene

Characterization of high-quality material reveals important details relevant to next generation nanoelectronic devices

Quantum mechanics is the field of physics governing the behavior of things on atomic scales, where things work very differently from our everyday world.

Im Focus: Graphene: A quantum of current

When current comes in discrete packages: Viennese scientists unravel the quantum properties of the carbon material graphene

In 2010 the Nobel Prize in physics was awarded for the discovery of the exceptional material graphene, which consists of a single layer of carbon atoms...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Networking 4.0: International Laser Technology Congress AKL’16 Shows New Ways of Cooperations

24.05.2016 | Event News

Challenges of rural labor markets

20.05.2016 | Event News

International expert meeting “Health Business Connect” in France

19.05.2016 | Event News

 
Latest News

11 million Euros for research into magnetic field sensors for medical diagnostics

27.05.2016 | Awards Funding

Fungi – a promising source of chemical diversity

27.05.2016 | Life Sciences

New Model of T Cell Activation

27.05.2016 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>