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Hospital, Police, Fire Station
Bridge or Transit Structure
Other, Mixed, or Don't Know
The title can be the building name, an address, or any other short descriptor, such as "Third Street Office Building," "Hayward church," or "My Oakland condo."
The I. Magnin project was a seismic retrofit of a historic four-story steel-framed building using propped shear walls. The latter allowed the owner to preserve the Art Deco terra-cotta-and-stone façade while retaining maximum open-floor space. The system consists of a tall, slender concrete shear wall propped near the top with multistory diagonal steel braces. During large earthquakes, the slotted, bolted friction connections of the steel props, along with flexural yielding at the base of the shear wall, provide seismic-energy dissipating mechanisms. This system creates a high-performance lateral system that is less expensive and less architecturally intrusive than either steel braced frames or concrete shear walls acting alone. Modern Steel Construction magazine documented the retrofit in the article “Propped Shear Walls: Combining Steel Braces and Concrete Shear Walls for Seismic Strengthening of Existing Buildings.” Structural engineer: Tipping Mar (www.tippingmar.com) Architect: Ibsen Senty Architecture Contractor: Westfour Corporation Owner/Developer: SRM Associates
This is optional, but we hope you'll share what's significant or interesting to you about this retrofit. What prompted the retrofit project? Was it part of a larger project or program? What was the retrofit objective? Feel free to give engineering or cost details. What's your relationship to the project? You may add your company's name or a link to another site with more project details, as long as your Description is not soliciting business.
Original Structure Type
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Retrofit System Type
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Hybrid or Other
Year of Retrofit:
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1989, post-Loma Prieta
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Earthquake Engineering Research Institute
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