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 | Jun 2, 2022
New design guide for hybrid steel-mass timber frames released
The American Institute of Steel Construction (AISC) has released the first-ever set of U.S. recommendations for hybrid steel frames with mass timber floors, according to a news release.
Codes and Standards | Jun 1, 2022
HKS, U. of Texas Dallas partner on brain health study
HKS and The University of Texas at Dallas’ Center for BrainHealth are conducting a six-month study to improve the way the firm’s employees work, collaborate, and innovate, both individually and as an organization, according to a news release.
Mass Timber | May 31, 2022
Tall mass timber buildings number 139 worldwide
An audit of tall mass timber buildings turned up 139 such structures around the world either complete, under construction, or proposed.
Legislation | May 20, 2022
Arlington County, Virginia may legalize multifamily housing countywide
Arlington County, Va., a Washington, D.C.-area community, is considering proposed legislation that would remove zoning restrictions on multifamily housing up to eight units in size.
Codes and Standards | May 20, 2022
Wildfire threat score now available for all U.S. homes
The non-profit First Street Foundation has made publicly available a database that assesses the wildfire risk of all U.S. homes.
Coronavirus | May 20, 2022
Center for Green Schools says U.S. schools need more support to fight COVID-19
The Center for Green Schools at the U.S. Green Building Council released a new report detailing how school districts around the country have managed air quality within their buildings during the second year of the COVID-19 pandemic.
Regulations | May 20, 2022
Biden’s Clean Air in Buildings Challenge aims to reduce COVID-19 spread
The Biden Administration recently launched the Clean Air in Buildings Challenge that calls on all building owners and operators, schools, colleges and universities, and organizations to adopt strategies to improve indoor air quality in their buildings and reduce the spread of COVID-19.
Codes and Standards | May 19, 2022
JLL launches non-profit aiming to mitigate climate change
Real estate and investment management firm JLL recently launched JLL Foundation, a non-profit dedicated to making a long-term impact on environmental sustainability.
Biophilic Design | May 18, 2022
Horticulturalists conduct research study to understand the value of biophilic design
Benholm Group, horticulturalists that have pioneered the use of plants for interiors over the past 27 years, are collaborating on a research study to understand the value of biophilic design, according to a news release.
Building Team | May 17, 2022
MKA’s Embodied Carbon Action Plan will include reporting on carbon reductions for selected projects
Magnusson Klemencic Associates (MKA) recently released its SE 2050 Embodied Carbon Action Plan (ECAP) for 2022.
