Los Angeles Mayor Eric Garcetti on Monday proposed the most ambitious seismic safety regulations in California history that would require owners to retrofit thousands of building most at risk of collapse during a major earthquake.
Garcetti’s recommendations target two of the riskiest types of buildings in Los Angeles built before 1980: concrete buildings and wooden structures built atop weak first floors, such as those on top of carports and garages and supported by slender columns.
— LA Times
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LA city ordered high-rise retrofits for fire-life safety about 25 years ago. It was a big undertaking, first for non-residential buildings, then residential.
Some smaller municipalities (but not LA) ordered structural retrofits for wood-frame buildings over carports almost twenty years ago, after the '94 quake. A simple one-story moment frame the width of a parking space, made up of 6" S-sections centered on old 4" pipe columns. Bing bang boom, building after building. Now my living room doesn't sway at the whim of the seismic gods anymore.
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