seismic design updates for the california building code · 2019-09-06 · seismic design updates...
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Seismic Design Updates for
the California Building Code
Dave Baska PhD, PE, GE, CEG
August 2019
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Effective January 1, 2020
All applications for a building permit
submitted on or after January 1, 2020 are
subject to compliance to the 2019 CBC
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Outline
▪ Ground motions
▪ Ground displacements
▪ Future issues
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Outline
▪ Ground motions
▪ Ground displacements
▪ Future issues
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UBC End Result
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Computing Response Spectra
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The “Problem”
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The Solution
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Outline
▪ Ground motions
▪ Ground displacements
▪ Future codes
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ASCE 7-16
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Lateral Spread Threshold
▪ LA County (Youd 1989): 12 inches
▪ ASCE 7-16: 4, 12 and 18 inches (RC IV,
III, and II)
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ASCE 7-16
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Differential Settlement Threshold
▪ LA County (Youd 1989): 1 inch over 30
feet (4 inches of total settlement)
▪ OSHPD/DSA: L/600
▪ ASCE 7-16: 2-1/2 to 3 inches over 30 to
50 feet (RC II and III)
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ASCE 7-16 Summary
▪ Requires site-specific ground motion study
for more projects (Chapter 11)
▪ Site-specific procedures are enhanced
(Chapter 21)
▪ Provides threshold values of post-
liquefaction displacement for shallow
foundations (Chapter 12)
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Outline
▪ Ground motions
▪ Ground displacements
▪ Future issues
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Future Issues
▪ Multi-period design spectrum (ASCE 7-22)
▪ Performance of existing, vulnerable
buildings
▪ Performance-based design
▪ Not life safety, but continued function for
new buildings
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Existing Vulnerable Buildings
▪ Before 1976 UBC:
– Unreinforced masonry
– Nonductile concrete buildings
– Soft or weak ground floor level
▪ Before 1998 CBC (1997 UBC)
– Steel moment frame connections
– Precast, prestressed or post-tensioned
concrete
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Performance-Based Design
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Continued Function
▪ Resilient communities
– Occupiable buildings, including limited non-
structural damage
– Lifeline infrastructure
▪ As much a social and economic matter as
it is a technical one
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