PEER Reports

PEER Reports

Stochastic Modeling and Simulation of Ground Motions for Performance-Based Earthquake Engineering, PEER Report 2010-02

Sanaz Rezaeian
Armen Der Kiureghian
2010

A fully nonstationary stochastic model for strong earthquake ground motion is developed. The model employs filtering of a discretized white-noise process.
Nonstationarity is achieved by varying the filter properties and modulating the intensity of the process in time. Separation of the spectral and temporal nonstationary characteristics of the process allows flexibility and ease in modeling and parameter estimation. The evolving intensity and time-varying frequency content of the process are characterized by a set of statistical measures including the mean-square intensity, the mean...

Application Guide for the Design of Flexible and Rigid Bus Connections between Substation Equipment Subjected to Earthquakes, PEER Report 2010-04

Jean-Bernard Dastous
Armen Der Kiureghian
2010

Interaction between equipment subjected to earthquakes is an area of major concern to engineers intent on seismically hardening a substation. The buswork connections installed between equipment greatly affect the seismic performance of that equipment. If the buswork is not properly designed, equipment that would otherwise survive may fail, resulting in unnecessary financial losses or reliability impact. The use of seismically designed connections, whether flexible, rigid, or a combination of both, increases the probability that a facility will still be operational after an earthquake....

Guidelines for Performance- Based Seismic Design of Tall Buildings, PEER Report 2010-05

2010

These Guidelines for Performance-Based Seismic Design of Tall Buildings present a recommended alternative to the prescriptive procedures for seismic design of buildings contained in standards such as ASCE 7 and the International Building Code (IBC). They are intended primarily for use by structural engineers and building officials engaged in the seismic design and review of individual tall buildings. Properly executed, the Guidelines are intended to result in buildings that are capable of achieving the seismic performance objectives for Occupancy Category II...

Ground-motion prediction equations 1964 - 2010, PEER Report 2011-102

John Douglas
2011

This report summarizes all empirical ground-motion prediction equations (GMPEs), to estimate earthquake peak ground acceleration (PGA) and elastic response spectral ordinates, published between 1964 and 2010 (inclusive). This report replaces: the Imperial College London report of Douglas (2004a), which provided a summary of all GMPEs from 1964 until the end of 2003; the BRGM report of Douglas (2006), which summarized all GMPEs from 2004 to 2006 (plus some earlier models); and the report of Douglas (2008), concerning GMPEs published in 2007 and 2008 (plus some earlier models). In addition,...

Stochastic Dynamic Analysis of Bridges Subjected to Spatially Varying Ground Motions, PEER Report 2011-105

Katerina Konakli
Armen Der Kiureghian
2011

Using response spectrum and time-history analysis methods, we perform a thorough investigation of the response of bridges subjected to spatially varying support motions. Three main causes of spatial variability are considered: the incoherence effect, which represents random differences in the amplitudes and phases of seismic waves due to reflections and refractions that occur during wave propagation in the heterogeneous medium of the ground and due to differential superposition of waves arriving from different parts of an extended source; the wave-passage effect, which...

The Use of Base Isolation Systems to Achieve Complex Seismic Performance Objectives, PEER Report 2011-06

Troy A. Morgan
Stephen A. Mahin
2011

One concern in the design of base isolated structures is the selection of isolation system properties so that optimal performance is achieved over a range of seismic levels and performance metrics. To withstand very rare ground motions, isolation bearings are frequently designed with significant strength or damping, and as a result such devices provide reduced isolation effect for more frequent seismic events. To investigate possible improvements to the design of isolated
structures, an extensive research program is conducted. Analytical and experimental investigations are presented to...

Water Supply in regard to Fire Following Earthquake, PEER Report 2011-08

Charles Scawthorn
2011

A major earthquake in Los Angeles, San Diego or the San Francisco Bay Area is expected to result in numerous fires. A survey of fire and water agencies (with responses from those serving about one third of urbanized California) found poor understanding of the post-earthquake fire issue, and poor communication between fire and water agencies on this issue. In order to mitigate this problem, it is recommended that meetings should be held within the California fire service and the California water distribution community, to highlight this problem and enlist both communities in an effort to...

Earthquake Engineering for Resilient Communities: 2011 PEER Internship Program Research Report Collection, PEER Report 2011-10

Heidi Faison
Stephen A. Mahin
2011

Recent earthquakes in the United States and around the world have repeatedly shown that earthquake resilience is essential to building and sustaining urban communities. Earthquake resilience will play an increasingly important role in the professions associated with earthquake hazard mitigation, thus there is a need to educate the next generation of these professionals. To address this need, the Pacific Earthquake Engineering Research Center (PEER) coordinates a summer internship program for undergraduate students that focuses on the theme of earthquake-resilient communities. With funding...

Mechanics of Fiber Reinforced Bearings, PEER Report 2012-101

James M. Kelly
Andrea Calabrese
2012

The report contains the findings of a study on the mechanical behavior of unbonded fiber-reinforced bearings (FRB). Typical FRBs consist of several layers of rubber that are bonded to fiber reinforcing sheets. The purpose of the reinforcement is to prevent the rubber from bulging laterally under compressive load. The most important aspects of these bearings are (i) they do not have thick end plates; (ii) they are not bonded to the top and bottom support surfaces; and (iii) their reinforcements are very flexible. These aspects may seem to be design deficiencies, but they have the advantage...

Procedure to Restart an Interrupted Hybrid Simulation: Addendum to PEER Report 2010/103, PEER Report 2012-102

Vesna Terzic
Bozidar Stojadinovic
2012

A hybrid simulation can be intentionally or unintentionally interrupted. This document describes a procedure to restart an interrupted hybrid simulation. The restart of an interrupted hybrid simulation involves restoration of the state of the hybrid model to the state at the beginning of time step at the point at which the interruption occurred (the interrupt time step). Then the hybrid simulation from this point continues and the time steps until the planned simulation break or end occurs. The state of the hybrid model comprises the state of the hybrid simulation integrator (the outer...