Simulation-Informed Site-Specific Design Spectra for Engineers: New Beta Version Including ASCE 7-16, ASCE 41-17 and LATBSDC Standards

C.B. Crouse, Christine A. Goulet, Thomas H. Jordan, Kevin R. Milner, Edric Pauk, Scott Callaghan, & Robert W. Graves

Published August 15, 2019, SCEC Contribution #9759, 2019 SCEC Annual Meeting Poster #295

The SCEC Utilization of Ground Motion Simulation (UGMS) committee developed building-code conforming site-specific design spectra for the Los Angeles region. The long period (T ≥ 2-sec) response spectra were computed as the weighted average of spectral accelerations derived from (1) 3-D numerical ground-motion simulations using the CyberShake computational platform, and (2) empirical ground-motion models (GMMs) from the NGA-West2 project. The short period (T < 2-sec) response spectra were computed exclusively from the NGA-West2 GMMs. A web-based data-access tool was developed so users can obtain the desired response spectrum for a specified latitude and longitude and for a specified site class or 30-m average shear-wave velocity, VS30. The tool was originally developed to provide acceleration ordinates of the ASCE 7-16 risk-targeted Maximum Considered Earthquake (MCER) response spectrum, the metric used for the design of new buildings, at 21 natural periods in the 0 to 10-sec band. The new Beta tool adds design spectra based on the Los Angeles Tall Buildings Structural Design Council recommendations (LATBSDC) and based on ASCE 41-17, a standard addressing the rehabilitation of existing structures. For ASCE 41-17, users can select between the standard’s Basic Earthquake Safety (BSE) levels (BSE-2N & BSE-1N and BSE-2E & BSE-1E).

Key Words
CyberShake, numerical ground-motion simulations, ground-motion maps, UGMS, software, data

Citation
Crouse, C., Goulet, C. A., Jordan, T. H., Milner, K. R., Pauk, E., Callaghan, S., & Graves, R. W. (2019, 08). Simulation-Informed Site-Specific Design Spectra for Engineers: New Beta Version Including ASCE 7-16, ASCE 41-17 and LATBSDC Standards. Poster Presentation at 2019 SCEC Annual Meeting.

Related Projects & Working Groups
Earthquake Engineering Implementation Interface (EEII)