2020 NEHRP Provisions Issues Ground Motion

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Presentation transcript:

2020 NEHRP Provisions Issues Ground Motion C. B. Crouse 2016 BSSC Colloquium

Multiperiod response spectra Deterministic caps? Ground-Motion Issues Multiperiod response spectra Deterministic caps? Physics-based models (numerical simulations) Fault-rupture directivity & 3-D basins Site coefficients (Fa, Fv, FPGA) for CEUS Vertical component (Ch. 11.9) Induced seismicity? Soil-structure interaction – Ch. 19 Provisions for foundations on piles Footing-soil modeling & design Relax some restrictions

New Approach for Computing Long Period Sa Use Ground Motions from 3-D Numerical Models to Develop Long Period Sa Maps Application: L.A., SEA, SFO, SLC ASCE 7-22 Standard

Model Regional 3-D Effects on Long Period Motions a(t) Basin Fault Rock

Southern California Earthquake Center Utilization of Ground Motion Simulations Committee (SCEC UGMS) Goal: develop GM maps for L.A. region UGMS Committee formed in 2013; meets twice/yr SCEC performs calculations under UGMS direction

Los Angeles Sites

LAPD MCER

PAS MCER

COO MCER

Los Angeles Sites

CPP MCER

COO MCER

Intermediate Goal of UGMS MCER maps for L. A. City Amendment to ASCE 7-16 maps for City Resource to City and consultants Look-up tool ~ USGS web app tool