PEER Reports

PEER Reports

Low Seismic Damage Columns for Accelerated Bridge Construction, PEER Report 2020-10

Arpit Nema
Jose Restrepo
2020

This report describes the design, construction, and shaking table response and computation simulation of a Low Seismic-Damage Bridge Bent built using Accelerated Bridge Construction methods. The proposed bent combines precast post-tensioned columns with precast foundation and bent cap to simplify off- and on-site construction burdens and minimize earthquake-induced damage and associated repair costs. Each column consists of reinforced concrete cast inside a cylindrical steel shell, which acts as the formwork, and the confining and shear reinforcement. The column steel shell is engineered...

Blind Prediction of Shaking Table Tests of a New Bridge Bent Design, PEER Report 2020-09

Selim Gunay
Fan Hu
Khalid M. Mosalam
Arpit Nema
Jose Restrepo
Adam Zsarnoczay
Jack Baker
2020

Considering the importance of the transportation network and bridge structures, the associated seismic design philosophy is shifting from the basic collapse prevention objective to maintaining functionality on the community scale in the aftermath of moderate to strong earthquakes (i.e., resiliency). In addition to performance, the associated construction philosophy is also being modernized, with the utilization of accelerated bridge construction (ABC) techniques to reduce impacts of construction work on traffic, society, economy, and on-site safety during construction.

Recent years...

PEER Activities 2018—2020, PEER Report 2020-08

Khalid Mosalam
Amarnath Kasalanati
2020

The Pacific Earthquake Engineering Research Center (PEER) is a multi-institutional research and education center with headquarters at the University of California, Berkeley. PEER’s mission is to (1) develop, validate, and disseminate performance-based engineering (PBE) technologies for buildings and infrastructure networks subjected to earthquakes and other natural hazards, with the goal of achieving community resilience; and (2) equip the earthquake engineering and other extreme-event communities with new tools. This report presents the activities of the Center over the period of July 1,...

Comparison of NGA-Sub Ground-Motion Models, PEER Report 2020-07

Nicholas Gregor
Kofi Addo
Linda Al Atik
Gail M. Atkinson
David M. Boore
Yousef Bozorgnia
Kenneth W. Campbell
Brian S.-J. Chiou
Zeynep Gülerce
Behzad Hassani
Tadahiro Kishida
Nico Kuehn
Saburoh Midorikawa
Silvia Mazzoni
Grace A. Parker
Hongjun Si
Jonathan P. Stewart
Robert R. Youngs
2020

Ground-motion models (GMMs) for subduction earthquakes recently developed as part of the NGA-Subduction (NGA-Sub) project are compared in this report. The three models presented in this comparison report are documented in their respective PEER reports. Two of the models are developed for a global version and as well regionalized models. The third model is developed based on earthquakes contain in the NGA-Sub dataset only from Japan and as such is applicable for Japan. As part of the comparisons presented in this report, deterministic calculations are provided for the global and regional...

Development of NGA-Sub Ground-Motion Model of 5%-Damped Pseudo-Spectral Acceleration Based on Database for Subduction Earthquakes in Japan, PEER Report 2020-06

Hongjun Si
Saburoh Midorikawa
Tadahiro Kishida
2020

Presented within is an empirical ground-motion model (GMM) for subduction-zone earthquakesin Japan. The model is based on the extensive and comprehensive subduction database of Japanese earthquakes by the Pacific Engineering Research Center (PEER). It considers RotD50 horizontal components of peak ground acceleration (PGA), peak ground velocity (PGV), and 5%-damped elastic pseudo-absolute acceleration response spectral ordinates (PSA) at the selected periods ranging from 0.01 to 10 sec. The model includes terms and predictor variables considering tectonic setting (i.e., interplate and...

Conditional Ground-Motion Model for Peak Ground Velocity for Active Crustal Regions, PEER Report 2020-05

Norman A. Abrahamson
Sarabjot Bhasin
2020

Conditional models for the horizontal and vertical peak ground velocity (PGV), given the pseudospectral acceleration [PSA(T)] values, are developed for active crustal regions. The period of the PSA(T) used in the conditional model, TPGV , is magnitude dependent, which captures the effect of the magnitude dependence of the earthquake source corner frequency on the PGV. Conditional models can be used to estimate the PGV given a design spectrum and are applicable for magnitudes between 3.0 and 8.5, and for distances up to 200 km. The...

Partially Non-Ergodic Ground-Motion Model for Subduction Regions using the NGA Subduction Database, PEER Report 2020-04

Nicolas Kuehn
Yousef Bozorgnia
Kenneth W. Campbell
Nicholas Gregor
2020

This report presents a summary of the development, evaluation, and comparison of a new subduc-tion ground-motion model (GMM), now known as Kuehn-Bozorgnia-Campbell-Gregor (KBCG20) model. This GMM was developed as part of the Next Generation Attenuation for Subduction Regions (NGA-Sub) program using a comprehensive compilation of subduction interface and in-traslab ground-motion recordings and metadata compiled in the NGA-Sub database. The KBCG20 model includes ground-motion scaling terms for magnitude, distance, site amplification, and basin amplification. Some of these terms are adjustable...

NGA-Subduction Global Ground-Motion Models with Regional Adjustment Factors, PEER Report 2020-03

Grace A. Parker
Jonathan P. Stewart
David M. Boore
Gail M. Atkinson
Behzad Hassani
2020

Next Generation Attenuation Subduction (NGA-Sub) is a multi-year, multidisciplinary project with the goal of developing an earthquake ground-motion database of processed time series and ground-motion intensity measures (IMs), as well as a suite of ground-motion models (GMMs) for global subduction zone earthquakes. The project considers interface and intraslab earthquakes that have occurred in Japan, Taiwan, New Zealand, Mexico, Central America, South America, Alaska, and Cascadia. This report describes one of the resulting GMMs, one important feature of which is its ability to describe...

Data Resources for NGA-Subduction Project, PEER Report 2020-02

Yousef Bozorgnia (NGA-Sub PI)
Jonathan P. Stewart (Editor)
2020

The NGA-Subduction (NGA-Sub) project is one in a series of Next Generation Attenuation (NGA) projects directed towards database and ground-motion model development for applications in seismic-demand characterization. Whereas prior projects had targeted shallow crustal earthquakes, active tectonic regions (NGA-West1 and NGA-West2), and stable continental regions (NGA-East), NGA-Sub is the first to address specifically subduction zones, which are a dominant source of seismic hazard in many regions globally, including the Pacific Northwest region of the United States and Canada.

This...

Modeling Viscous Damping in Nonlinear Response History Analysis of Steel Moment-Frame Buildings: Design-Plus Ground Motions, Revision 1.0, PEER Report 2020-01

Xin Qian
Anil K. Chopra
Frank McKenna
2020

This report investigates the question: can seismic demands on steel moment-frame buildings due to Maximum Considered Earthquake (MCER) design-level ground motions [2% probability of exceedance (PE) in 50 years] be estimated satisfactorily using linear viscous damping models or is a nonlinear model, such as capped damping, necessary? This investigation employs two models of a 20-story steel moment-frame building: a simple model and an enhanced model with several complex features. Considered are two linear viscous damping models: Rayleigh damping and constant modal damping; and...