PEER Reports

PEER Reports

Performance Characterization of Bench- and Shelf-Mounted Equipment, PEER Report 2005-05

Samit Ray Chaudhuri
Tara C. Hutchinson
2005

It is now well recognized by the earthquake engineering community that even during a moderate seismic event extensive nonstructural damage may occur, resulting in a potential threat to life safety and significant economic losses. For equipment and building contents, the primary economic losses may be accrued due to operational failure or repair of the equipment and the associated downtime. In science laboratories or hospitals, equipment are generally placed on the surface of ceramic laboratory benches, which in turn are attached to the structural floor and ceiling systems. Therefore, the...

Global Collapse of Frame Structures under Seismic Excitations, PEER Report 2005-06

Luis F. Ibarra
Helmut Krawinkler
2005

Global collapse in earthquake engineering refers to the inability of a structural system to sustain gravity loads when subjected to seismic excitation. The research described in this report proposes a methodology for evaluating global incremental (side-sway) collapse based on a relative intensity measure instead of an engineering demand para meter (EDP). The relative intensity is the ratio of ground motion intensity to a structural strength parameter, which is increased until the response of the system becomes unstabl e. At this stage the relative intensity – EDP curve becomes flat (zero...

Experimental and Analytical Studies on the Seismic Response of Freestanding and Anchored Laboratory Equipment, PEER Report 2005-07

Dimitrios Konstantinidis
Nicos Makris
2005

This report presents the results of a comprehensive experimental program investigating the seismic response of freestanding and anchored laboratory equipment. The study is part of a broader study on the UC Science Laborator y facility that implements the performance-based earthquake engineering (PBEE) methodology proposed by the PEER Center.

In this study, quasi-static experiments were conducted in order to examine the mechanical behavior of the contact interface between laboratory equipment and the floors on which the equipment is situated. Based on the results of these experiments...

Damage Accumulation in Lightly Confined Reinforced Concrete Bridge Columns, PEER Report 2005-08

R. Tyler Ranf
Jared M. Nelson
Zach Price
Marc O. Eberhard
John F. Stanton
2005

Six reinforced concrete columns were tested at the University of Washington to evaluate the effects of cyclic loading on damage progression in lightly confined reinforced concrete circular bridge columns. The six columns, which were nominally identical, were typical of those built by the Washington State Department of Transportation until the mid-1970s.

The columns were subjected to a variety of lateral-deformation histories. These tests showed that increasing the number of cycles from 1 to 15 at each deformation level resulted in an approximately 30% reduction in the maximum column...

Test Applications of Advanced Seismic Assessment Guidelines, PEER Report 2005-09

Joe Maffei
Karl Telleen
Danya Mohr
William Holmes
Yuki Nakayama
2005

Advanced Seismic Assessment Guidelines, applicable to utility buildings, were developed by Stanford University (Bazzurro et al. 2004) as part of the PEER Lifelines Program, Building Vulnerability Studies (Project Task Number 507). The subject project, Task 508, applies these state-of-the-art guidelines in a detailed fashion to two example buildings, each with differing features and functions within the electric and gas utility network.

The first building studied is a three-story steel moment-frame building. The second building is an older type of utility structure of...

First NEES/E-Defense Workshop on Collapse Simulation of Reinforced Concrete Building Structures, PEER Report 2005-10

2005

Research collaboration agreements for earthquake disaster prev ention are in progress between U.S. and Japanese organizations: the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) and the National Science Foundation (NSF) on the U.S. side, and the National Research Institute for Earth Science and Disaster Prevention of Japan (NIED) and the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT). Collectively these organizations are known as the “NEES/E-Defense Earthquake Engineering Research Collaboration.” The purpose of the joint research...

Van Nuys Hotel Building Testbed Report: Exercising Seismic Performance Assessment, PEER Report 2005-11

Helmut Krawinkler
2005

Beginning with the Year 5 Research Program, PEER established a series of PEER Methodology Testbeds. The testbeds are real facilities, inventories of facilities, or networks to which the PEER performance-based earthquake engineering assessment methodologies can be applied. The primary purpose of the testbeds is to assess the applicability of the methodologies and foster their refinement. The testbeds serve supple mentary purposes such as further focusing and integrating the research, promoting multi-disciplinary research interactions, emphasizing systems-level research, and involving...

PEER Testbed Study on a Laboratory Building: Exercising Seismic Performance Assessment, PEER Report 2005-12

Mary C. Comerio
2005

From 2002 to 2004 (years five and six of a ten-year funding cycle), the PEER Center organized the majority of its research around six testbeds. Two buildings and two bridges, a campus, and a transportation network were selected as case st udies to “exercise” the PEER performance-based earthquake engineering methodology. All projects involved in terdisciplinary teams of researchers, each producing data to be used by other colleagues in their research. The testbeds demonstrated that it is possible to create the data necessary to populate the PEER performance- based framing equation, linking...

Stochastic Characterization and Decision Bases under Time-Dependent Aftershock Risk in Performance-Based Earthquake Engineering, PEER Report 2005-13

Gee Liek Yeo
C. Allin Cornell
2005

This report addresses the broad role of aftershocks in the Performance-based Earthquake Engineering (PBEE) process. This is an area which has, to date, not received careful scrutiny nor explicit quantitative analysis.

We begin by introducing Aftershock Probabilistic Seismic Hazard Analysis (APSHA). APSHA, similar to conventional mainshock PSHA, is a procedure to characterize the time- varying aftershock ground motion hazard at a site. We next show a methodology to quan- tify, in probabilistic terms, the multi-damage-state capacity of buildings in different post- mainshock damage...

Workshop on Modeling of Nonlinear Cyclic Load- Deformation Behavior of Shallow Foundations, PEER Report 2005-14

Bruce L. Kutter
Geoffrey Martin
Tara Hutchinson
Chad Harden
Sivapalan Gajan
Justin Phalen
2005

A PEER-sponsored workshop on the nonlinear cyclic load-deformation behavior of shallow foundations was held at UC Davis on March 5, 2003. This report contains all of the documents distributed for discussion prior to that workshop and closes with a summary chapter based on workshop discussions.

Goals of the Workshop:

To disseminate a summary of research findings from the PEER multi-campus research project on shallow foundations and to discuss a plan for future related research. To receive feedback from structural engineers, practicing engineers, and geotechnical peers to improve...