ASTM has released a new HSS standard, A1085 - 13 Standard Specification for Cold-Formed Welded Carbon Steel Hollow Structural Sections (HSS), which will result in the production of improved hollow structural sections (HSS). This specification is a big step forward in simplifying HSS design and usage, thereby making it a more desirable option for HSS.
"We were committed to the development of the new ASTM A1085 specification as it was needed to improve the performance of HSS used in structural applications such as seismic load resisting systems, bridge structures and other dynamically loaded structures," said Brad Fletcher, senior sales engineer with AISC-member Atlas Tube. According to Fletcher, round and square members from 6 in. and up will likely be the main shapes Atlas initially produce under the new specification.
Benefits include:
- Tighter material tolerances and a single minimum yield stress of 50 ksi. Because of the more stringent wall tolerances and the addition of a mass tolerance, it's anticipated that AISC's Committee on Specifications will shortly issue guidelines allowing the full nominal wall thickness can be used for design of HSS. This means no longer needing to reduce the nominal wall thickness by 0.93 as prescribed in the AISC Steel Construction Manual for both member selection and connection design. And more area available for design and a higher minimum yield mean that HSS will become a more economical and efficient design option.
- Maximum specified yield stress of 70 ksi. This will result in a lower expected yield strength for seismic design, and thereby reduce capacity design requirements when HSS are the yielding element. For example, with ASTM A1085 HSS braces in a braced frame, the beams and columns will have lower required strengths. ASTM A1085 is the only HSS specification used in North America or Europe that limits the maximum yield stress.
- Standard requirement for notch toughness. The specification will require all HSS to meet a minimum Charpy V-notch (CVN) value of 25 ft-lb at 40°F, which corresponds to AASHTO Zone 2 requirements. Having the minimum CVN required makes HSS more suitable for use in dynamically loaded structures.
"A1085 makes designing with HSS easier and more efficient for both building and bridge construction," said John Simon, vice president of sales with AISC-member EXLTUBE. "We are hearing a great response from structural engineers who have begun to learn about this new spec through efforts at NASCC: The Steel Conference and other communications, and we're working closely with AISC and the Steel Tube Institute to begin promoting A1085 to our customers. EXLTUBE will be supporting these efforts with inventory as soon as we've determined the sizes the market will require from us."
John Tassone, marketing manager for AISC-member Independence Tube, also commented: "We will be manufacturing and inventorying the product as the need arises," adding that the company will likely concentrate on squares and rounds 4 in. and above to start.
For specific price and availability information, please contact HSS producers and service centers. Contact information is available at www.aisc.org/hss.
About the American Institute of Steel Construction
The American Institute of Steel Construction, headquartered in Chicago, is a not-for-profit technical institute and trade association established in 1921 to serve the structural steel design community and construction industry. AISC's mission is to make structural steel the material of choice by being the leader in structural steel-related technical and market-building activities, including: specification and code development, research, education, technical assistance, quality certification, standardization, and market development. AISC has a long tradition of service to the steel construction industry of providing timely and reliable information.
Related Stories
| Aug 11, 2010
Polshek Partnership unveils design for University of North Texas business building
New York-based architect Polshek Partnership today unveiled its design scheme for the $70 million Business Leadership Building at the University of North Texas in Denton. Designed to provide UNT’s 5,400-plus business majors the highest level of academic instruction and professional training, the 180,000-sf facility will include an open atrium, an internet café, and numerous study and tutoring rooms—all designed to help develop a spirit of collaboration and team-oriented focus.
| Aug 11, 2010
University of Florida aiming for nation’s first LEED Platinum parking garage
If all goes as planned, the University of Florida’s new $20 million Southwest Parking Garage Complex in Gainesville will soon become the first parking facility in the country to earn LEED Platinum status. Designed by the Boca Raton office of PGAL to meet criteria for the highest LEED certification category, the garage complex includes a six-level, 313,000-sf parking garage (927 spaces) and an attached, 10,000-sf, two-story transportation and parking services office building.
| Aug 11, 2010
Draft NIST report on Cowboys practice facility collapse released for public comment
A fabric-covered, steel frame practice facility owned by the National Football League’s Dallas Cowboys collapsed under wind loads significantly less than those required under applicable design standards, according to a report released today for public comment by the Commerce Department's National Institute of Standards and Technology (NIST).
| Aug 11, 2010
Callison, MulvannyG2 among nation's largest retail design firms, according to BD+C's Giants 300 report
A ranking of the Top 75 Retail Design Firms based on Building Design+Construction's 2009 Giants 300 survey. For more Giants 300 rankings, visit http://www.BDCnetwork.com/Giants
| Aug 11, 2010
USGBC honors Brad Pitt's Make It Right New Orleans as the ‘largest and greenest single-family community in the world’
U.S. Green Building Council President, CEO and Founding Chair Rick Fedrizzi today declared that the neighborhood being built by Make It Right New Orleans, the post-Katrina housing initiative launched by actor Brad Pitt, is the “largest and greenest community of single-family homes in the world” at the annual Clinton Global Initiative meeting in New York.
| Aug 11, 2010
AIA report estimates up to 270,000 construction industry jobs could be created if the American Clean Energy Security Act is passed
With the encouragement of Senate majority leader Harry Reid (D-NV), the American Institute of Architects (AIA) conducted a study to determine how many jobs in the design and construction industry could be created if the American Clean Energy Security Act (H.R. 2454; also known as the Waxman-Markey Bill) is enacted.
| Aug 11, 2010
Architect Michael Graves to be inducted into the N.J. Hall of Fame
Architect Michael Graves of Princeton, N.J., being inducted into the N.J. Hall of Fame.
| Aug 11, 2010
Modest rebound in Architecture Billings Index
Following a drop of nearly three points, the Architecture Billings Index (ABI) nudged up almost two points in February. As a leading economic indicator of construction activity, the ABI reflects the approximate nine to twelve month lag time between architecture billings and construction spending.
