PRE-NORTHRIDGE STEEL MOMENT FRAME RETROFIT
Pre-Northridge Steel moment frame construction is a class of building that relies on structural moment frame action to absorb and dissipate energy imparted during earthquakes. Largely constructed between the mid-1970s through early 1994, they are deemed vulnerable to the earthquake hazard by virtue of the type of their structurally-inadequate beam-to-column connections in which beam flanges are welded to column flanges but the beam webs are only bolted to the column flanges. Extensive structural failures of these connections occurred during the Northridge Earthquake of January 17, 1994 in heavily shaken areas which were typically characterized by sudden brittle weld failure, some of which extended into the base metal, causing costly damage repairs. Mandatory retrofitting of these vulnerable connections is now required in numerous building jurisdictions in California. Use of fluid viscous dampers, acting like large shock absorbers, have proven very effective in both voluntary and mandatory seismic retrofits by controlling excessive stress demands on vulnerable connections and by limiting seismically-induced lateral deflections.
Kilroy 999
El Segundo, California
Eight (8) Story Office Tower and Three (3) Story Addition
Structural Engineering Design and Seismic Upgrade Design
Colorado Center, Santa Monica, California
Six (6) Office Building Campus, ~2,349,765 gsf
Property Condition Assessment and Seismic Risk Assessment,
Seismic Upgrade Design
Farmers Annex II
Los Angeles, California
Three (3) Story Low-Rise Office Building over Subterranean Parking Garage
Seismic Risk Assessment & Voluntary Seismic Retrofit
Farmers Annex II
Los Angeles, California
Three (3) Story Low-Rise Office Building over Subterranean Parking Garage
Seismic Risk Assessment & Voluntary Seismic Retrofit
Farmers Annex II
Los Angeles, California
Three (3) Story Low-Rise Office Building over Subterranean Parking Garage
Seismic Risk Assessment & Voluntary Seismic Retrofit
Farmers Annex II
Los Angeles, California
Three (3) Story Low-Rise Office Building over Subterranean Parking Garage
Seismic Risk Assessment & Voluntary Seismic Retrofit
131 S. Rodeo, Beverly Hills, California
Three (3) Story Mixed-Use Retail & Office Building Over Subterranean Parking Garage
Pre-Northridge Steel Moment Frame Retrofit
131 S. Rodeo, Beverly Hills, California
Three (3) Story Mixed-Use Retail & Office Building Over Subterranean Parking Garage
Pre-Northridge Steel Moment Frame Retrofit
St. Joseph Heritage Medical Office Building
Santa Ana, California
Three (3) Story Medical Office Building
Pre-Northridge Steel Moment Frame Retrofit
St. Joseph Heritage Medical Office Building
Santa Ana, California
Three (3) Story Medical Office Building
Pre-Northridge Steel Moment Frame Retrofit
