The American Institute of Steel Construction (AISC) recently issued a draft of AISC 341, a standard that provides guidance on designing earthquake-resistant steel buildings and it is available for public comments.
The draft standard incorporates new design limits for steel columns based on research conducted by the National Institute of Standards and Technology (NIST) and the University of California San Diego. Using a shake table, researchers identified deficiencies in the performance of a certain type of column, with many test assemblies buckling prematurely.
Based on the findings, the researchers devised new limits for the cross-sectional slenderness of steel columns. “A lot of current design provisions are based on scaled-down column tests or a very small number of full-scale tests,” said NIST structural engineer John Harris in a news release. “But the full-scale testing we conducted has allowed us to begin filling in the knowledge gap regarding the performance of these kinds of columns under extreme loading conditions.”
The draft includes new slenderness limits on columns, with structural steel webs—sized according to the new limit—that could meet drift and stability requirements at the same time. The more stringent limits on steel column webs could soften the blow of earthquakes, potentially saving newly designed buildings from unnecessary damage or partial collapse.
Related Stories
| Oct 28, 2011
Los Angeles County mulling building codes for improving health
An ordinance would amend county building codes to promote better walking environments, encourage more bicycling, improve access to healthy foods (farmers markets, community gardens), and enhance project review requirements to ensure that developers include healthy-lifestyle components in their building plans.
| Oct 28, 2011
Bipartisan opposition to federal 3% withholding for contractors
Both major political parties and the Obama Administration support repealing a law that would withhold 3% of all government contracts.
| Oct 28, 2011
OSHA requires training module on top causes of construction deaths
The Occupational Health and Safety Administration (OSHA) now requires a training module on the top four causes of death for construction workers.
| Oct 28, 2011
New York City requiring building energy use to be posted online
Owners of every New York City commercial and residential building larger than 50,000 sf will have to post each building’s energy use online by 2013.
| Oct 28, 2011
New ISO standard for escalator safety
A new ISO standard specifies safety requirements for escalators and moving walks.
| Oct 20, 2011
LEED 2012 to require real-time energy, water use reporting
The LEED 2012 rating system, set to launch in November 2012, will contain features to make sure buildings function as intended, and improve over time.
| Oct 20, 2011
New York City moving to speedier, online design reviews
New York City is moving towards a development design review process that will let officials and developers review blueprints for new projects online in a virtual conference room rather than in person.
| Oct 20, 2011
Michigan bill would let private firms operate as a city’s building department
Michigan House Bill 5011 would change state’s building code to allow private companies to operate as a municipality's building department.
| Oct 20, 2011
Alabama’s strict immigration law drives away construction workers
Alabama's strict new immigration law is driving many construction workers and roofers from the state.
| Oct 20, 2011
Fed bill would allow school rehab funding via historic tax credits
Virginia Sens. Jim Webb (D) and Mark Warner (D) introduced a bill this month to rehab aging schools across the country through the use of historic tax credits.
