Thirty-nine high rises in San Francisco are at risk of collapse in a major earthquake, according to a new study by the U.S. Geological Service (USGS).
The vulnerable buildings (known as welded steel moment-frame buildings) were constructed by using a flawed technique to weld columns and beams together. This technique was found to be less resilient to seismic activity after the 1994 Northridge earthquake in Los Angeles where critical joints were damaged in several buildings that had been welded.
The building code was revised in the mid-1980s to require more stiffness, and then again in the mid-1990s to correct the defective welding technique. San Francisco outlawed the technique in1994 after damage from the Northridge quake on high rises was discovered. The list of vulnerable structures includes the former Bank of America building, the headquarters of Pacific Gas and Electric, three hotels, and the Salesforce West tower.
San Francisco has offered incentives to repair at-risk buildings. In 2009, the city expedited permits and agreed to waive fees for so-called “soft-story buildings” that have garages or windows on the bottom floor.
Related Stories
Codes and Standards | Feb 16, 2021
Bechtel joins international heat resilience organization
Experience designing resilience standards to aid effort to protect communities from extreme heat.
Codes and Standards | Feb 10, 2021
More than two-thirds of construction companies say COVID-19 has not impacted their ESOP
Half of survey respondents say 2020 project profitability decreased due to pandemic.
Codes and Standards | Feb 9, 2021
New Jersey approves new electric vehicle-ready home requirement
Homebuyers must be given option for charging station on new construction.
Codes and Standards | Feb 9, 2021
New California law removes barriers to residential development
Measure removes restrictions for ADUs in urban areas and master planned communities.
Codes and Standards | Feb 8, 2021
Alliance yields more accurate data for rating and certifying systems of construction materials
Crosswalk API offers trusted format to specify and procure healthier products.
Codes and Standards | Feb 4, 2021
2021 IBC requires automatic doors for entrances to public buildings
One door must be either a full power-operated door or a low-energy power-operated door.
Codes and Standards | Feb 3, 2021
Two new International Code Council online code tools released
Offer detailed information about global building code usage and U.S. adoptions.
Codes and Standards | Feb 2, 2021
Biden tells OSHA to bolster COVID-19 safety rules
Order could lead to a national playbook for fighting COVID-19 on jobsites.
Codes and Standards | Feb 1, 2021
Fenestration Alliance updates standard for mulled combination assemblies
Last updated in 2010, document describes procedures and requirements for air leakage, water resistance, and structural performance.
Codes and Standards | Jan 28, 2021
Natl. Fire Protection Assn. releases new energy storage system fact sheet
Comes as Biden Administration prepares ambitious clean energy agenda.
