Seismic Resiliency: Understanding ACR 151
By Tom Sheehy
As Californians prepare for inevitable earthquakes, the importance of seismic resilience cannot be overstated. While much attention focuses on building structures, the resilience of nonstructural elements—piping, wiring, and HVAC systems—often gets overlooked. Assembly Concurrent Resolution (ACR) 151, introduced by Assemblymember Lisa Calderon, seeks to address this gap by promoting nonstructural seismic technologies.
What is ACR 151?
ACR 151 urges prioritizing nonstructural seismic technologies—affordable solutions designed to protect components critical for building functionality. When an earthquake hits, damage to nonstructural elements can render a building unusable, even if structurally intact. ACR 151 advocates adopting seismically vetted technologies to ensure buildings remain operational, minimizing downtime and aiding post-disaster recovery.
Why Focus on Nonstructural Seismic Resilience?
Seismic resilience refers to a building's ability to withstand and recover from earthquakes. While seismic codes primarily focus on preventing collapse and protecting occupants, nonstructural damage can cause prolonged closures and costly repairs. ACR 151 focuses attention on these components, emphasizing their role in maintaining critical systems—like electricity, plumbing, and HVAC—after a quake.
Legislative Background and Current Status
ACR 151 builds on previous efforts like AB 1857, which sought to establish functional recovery standards after earthquakes but was vetoed in 2018. Introduced in February 2024, the resolution received support from groups such as the Earthquake Engineering Research Institute and Omega Flex, Inc., emphasizing the role of nonstructural technologies in ensuring public safety and economic resilience. ACR 151 passed the Senate on August 22, 2024.
Looking Ahead
While ACR 151 doesn’t impose new regulations, it marks a key step toward improving California’s seismic preparedness. By recognizing the significance of nonstructural components, the resolution encourages building owners, engineers, and policymakers to think beyond structural safety. If widely embraced, the principles championed by ACR 151 could set a new standard for earthquake preparedness, helping ensure buildings remain functional after a disaster.
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