PEER Reports

PEER Reports

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

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

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.


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

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...

City-Scale Multi-Infrastructure Network Resilience Simulation Tool, PEER Report 2021-05

Kenichi Soga
Renjie Wu
Bingyu Zhao
Chaofeng Want

The goal of this project is to deliver a coherent framework of simulation tools that can quantify the performance of the water distribution network (WDN) and the transportation network at the city scale under different ground-motion scenarios. In addition to tool development, this project also investigates the potential interactions between structural and infrastructure systems in the case of normal operational and various earthquake damage scenarios. A multi-threaded, high-performance computing (HPC) scalable semi-dynamic traffic simulation model has been developed to understand the...

Effective Stress Analysis of Liquefaction Sites and Evaluation of Sediment Ejecta Potential, PEER Report 2021-03

Daniel Hutabarat
Jonathan D. Bray

Sediment ejecta mechanism contributes significantly to the severity of liquefaction-induced ground failure (e.g., excessive land subsidence). Estimating the amount of ejected sediment is a key step to assess the severity of ground failure; however, procedures to quantify it are currently lacking. Sediment ejecta is a post-shaking phenomenon resulting from the migration and redistribution of excess-pore-water-pressure (ue) generated during earthquake shaking. The dissipation process of residual ue can trigger high-gradient upward seepage, which...

Towards Multi-Tier Modeling of Liquefaction Impacts on Transportation Infrastructure, PEER Report 2021-04

Brett Maurer
Mertcan Geyin
Alex J. Baird

Semi-empirical models based on in situ geotechnical tests have been the standard-of-practice for predicting soil liquefaction since 1971. More recently, prediction models based on free, readily available data have grown in popularity. These “geospatial models” rely on satellite remote sensing to infer subsurface traits without in situ tests. While the concept of such an approach is not new, the recent models of Zhu et al. [2015; 2017] are arguably the most rigorously formulated and well-trained to date. The use of such models is appealing for a range of applications, but these models have...

Use of Corridors for Decision Making in Transportation Networks in Seismic Regions, PEER Report 2021-09

Rodrigo I. Silva-Lopez
Jack W. Baker

This report presents the results of the study that proposes a retrofitting strategy to manage seismic risk via identification of what constitutes "Corridors” in transportation networks. We define a Corridor as a set of bridges that work together to ensure connectivity and traffic flow between areas of a region. We propose using a Markov clustering algorithm to detect Corridors, whereby it selects sets of bridges that correspond to highway and main road segments that are effective in reducing disruption when jointly retrofitted. We then use a two-stage stochastic optimization to identify...

Seismic Performance of Column-to-Drilled-Shaft Connections in Reinforced Concrete Bridges, PEER Report 2021-10

Michelle Chang
John Stanton
Marc Eberhard

Drilled shaft foundations are often used to support reinforced concrete bridge columns founded in soft soils or in locations where a small footprint is desired. Increasingly, the shaft is being built with a diameter larger than that of the column, to allow tolerance in the column placement and to facilitate plastic hinge formation in the column rather than in the shaft. The column–shaft connection, which involves a noncontact splice between the column and shaft bars, is a key component in this structural system. However, there is limited research on the behavior of these connections under...

F-Rec Framework: Novel Framework for Probabilistic Evaluation of Functional Recovery of Building Systems, PEER Report 2021-06

Vesna Terzic
Peny K. Villaneuva
Daniel Saldana
Dong Y. Yoo

Earthquakes are one of the most destructive natural disasters with potentially devastating consequences on communities and the supporting infrastructure. To mitigate the effects of earthquakes on communities and infrastructure, the recovery process of building systems should be considered during the design of the building as it is essential for continued operation. This study presents a novel, probabilistic, building-level framework for modeling and evaluating the entire recovery process (F-Rec Framework), including a building’s post-earthquake functionality along with duration and path of...

PEER Annual Report 2020–2021, PEER Report 2021-11

Khalid M. Mosalam
Amarnath Kasalanati

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,...

The PEER International Pacific Rim Forum 2021: Regional-Scale Simulation of Earthquake Ground Motions and Infrastructure Response for Performance-Based Earthquake Engineering, PEER Report 2022-04

David McCallen
Floriana Petrone
Elnaz Esmaeilzadeh Seylabi
Arben Pitarka
Norman Abrahamson
Sherif Elfass

The continued rapid advancements in High Performance Computing (HPC) hardware and supporting computational ecosystems, combined with new understanding of the underlying physics of earthquake processes, are providing the foundation for the simulation of earthquake ground motions and infrastructure response at regional scale. This latest in a series of Pacific Earthquake Engineering Research Center (PEER) Pacific Rim Forums brought together a...