Non-ductile concrete buildings represent a significant seismic hazard, particularly in regions prone to earthquakes like Southern California. These structures were typically constructed before stringent seismic design standards were implemented in building codes. Characterized by their brittle nature, non-ductile concrete buildings lack the flexibility and reinforcement necessary to withstand the lateral forces generated by seismic events.
Non-ductile concrete buildings are primarily composed of concrete columns, walls, beams, and floors that are rigid and unable to bend or stretch significantly during earthquakes.
Most non-ductile concrete buildings were built before the mid-1970s, using construction practices that did not prioritize seismic resilience.
These buildings typically exhibit deficiencies in their lateral force-resisting systems, such as inadequate connections between structural elements, which compromises their ability to withstand seismic shaking.
Due to their inherent structural weaknesses, non-ductile concrete buildings are at higher risk of severe damage or collapse during earthquakes. Recognizing these risks, local governments have implemented mandatory retrofit ordinances to enhance the seismic resilience of these buildings and mitigate potential hazards to occupants and surrounding communities. Understanding the characteristics and vulnerabilities of non-ductile concrete buildings is crucial for property owners and stakeholders looking to ensure the safety and longevity of their structures in earthquake-prone areas.
Retrofitting a non-ductile concrete building involves strategic upgrades to enhance its seismic resilience and bring it up to current safety standards. These buildings, constructed before modern seismic codes, require structural reinforcements to withstand earthquake forces effectively.
At Quake Strong, we offer a 100% FREE comprehensive engineering assessment to evaluate the existing structural conditions and identify vulnerabilities. This involves detailed analysis of as-built plans and, if necessary, non-destructive testing to assess material strengths and conditions.
Based on the assessment, retrofit strategies are selected to address specific vulnerabilities identified in the structure. Common methods for retrofitting focus on enhancing structural integrity and resilience without compromising safety standards. These methods are chosen based on their effectiveness in mitigating risks associated with non-ductile concrete buildings and may include:
Reinforced Concrete Shear Walls: Adding new concrete walls that can resist lateral forces and distribute seismic loads.
Special Moment Frames (Steel or Concrete): Installing frames that provide flexibility and strength to the building structure.
Column Wrapping or Jacketing: Strengthening existing columns with additional materials to enhance their load-bearing capacity.
Base Isolation Systems: Introducing flexible bearings or isolators between the building and its foundation to absorb seismic energy.
Once retrofit plans are approved, construction begins. This phase involves meticulous implementation of engineering designs, which may include:
Foundation Upgrades: Strengthening foundations to support new seismic-resistant elements.
Structural Enhancements: Installing retrofit components like shear walls or moment frames according to engineered specifications.
Material Compliance: Ensuring all materials meet seismic design requirements and are installed correctly to maximize effectiveness.
Throughout the process, compliance with local retrofit ordinances and building codes is ensured. Upon completion, a Certificate of Compliance is obtained, verifying that the building meets current seismic safety standards.
Existing city ordinances require property owners to comply within the specified timelines of their respective programs. While these timelines may vary by city, they generally fall within the following ranges:
Property owners must comply with the requirements of LADBS Ordinance No. 183893 within the following time frames from the date of the Order to Comply:
● Submit the completed LADBS Checklist along with the supporting documents required by the checklist.
Submit one of the following:
● Proof of previous retrofit.
● Structural analysis and detailed plans showing full compliance with the retrofit ordinance.
● Plans to retrofit.
● Plans to demolish.
● Complete construction and obtain a Certificate of Compliance.
Property owners of non-ductile concrete buildings must adhere to the following deadlines from the receipt date of the Order to Comply as stipulated by Santa Monica City Ordinance No. 2527:
● Submit a structural evaluation report.
● Apply for a building permit and submit the necessary plans.
● Complete construction and obtain final approval along with a Certificate of Compliance.
For buildings identified as needing a non-ductile concrete retrofit under West Hollywood Ordinance No. 17-1011, property owners must adhere to the following schedule from the receipt of the Order to Comply:
● Within 3 years: Submit an engineering report detailing all structural deficiencies.
● Within 5 years: Submit retrofit plans addressing major deficiencies.
● Within 7 years: Obtain a building permit and begin construction.
● Within 10 years: Complete construction for major deficiency mitigation.
● Within 13 years: Submit comprehensive retrofit plans.
● Within 15 years: Obtain a building permit and start construction.
● Within 20 years: Finish all construction work.
With 30+ years of experience, our team comprises experts who specialize in retrofit solutions tailored to your building's unique needs. We have successfully completed hundreds of projects in Southern California, ensuring compliance with local ordinances and exceeding industry standards.
From initial inspections and engineering assessments to final construction and compliance, we manage every aspect of your retrofit project. Our comprehensive approach ensures a seamless process from start to finish, minimizing disruption and maximizing efficiency.
We prioritize quality in every phase of our projects. Our meticulous attention to detail, use of advanced technologies, and adherence to best practices ensure that your building receives the highest standard of customized seismic retrofitting.
Our commitment to client satisfaction is unwavering. We prioritize clear communication, transparency in pricing, and timely project completion, ensuring that your experience with us is smooth and stress-free.
Choosing QuakeStrong means choosing peace of mind. You can rest assured that your non-ductile concrete building is fortified against seismic risks, safeguarding occupants and preserving property value.
Construction Update: Demo is complete ✅, T35 clips installed in the frame 🔩, and shoring is secure 🔧. We’re gearing up for the steel moment frame installation to fortify this soft-story building. 💪
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Phase two in progress: we`ve cleared out the old and set the stage for new steel cantilever columns, making this building Quake Strong! 🚧🔩
Our soft story retrofit is in full swing, enhancing seismic resilience and fortifying this soft-story structure from the ground up! Stay tuned as we continue to build strength and safety.
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