MCEER technical reports are published to communicate specific research data and project results. Reports are written by MCEER-funded researchers, and provide information on a variety of fields of interest in earthquake engineering. The proceedings from conferences and workshops sponsored by MCEER are also published in this series.
MCEER’s web site offers a complete list of technical reports, abstracts, and prices. The publications catalog allows users to search the report list by subject, title and author, and to place orders for these reports. Visit the site at http://mceer.buffalo.edu/publications/default.asp.
Over 100 experts from a wide variety of backgrounds participated in Lessons from the World Trade Center Terrorist Attack: Management of Complex Civil Emergencies and Terrorism-Resistant Civil Engineering Design, held in New York City on June 24-25, 2002. The proceedings summarize the findings from the workshop and include, in digital format (on CD-ROM), the presentations made by most of the speakers. This special format was designed to share, to the fullest extent possible, the visuals and video-clips that constituted an essential part of some presentations and greatly enriched communication of the concepts presented. Complementing these electronic presentations are abstracts from most presentations and short biographical sketches of most authors. Finally, a few authors volunteered additional longer technical documents, which are included on the CD-ROM.
This report describes a series of numerical analyses that address spread footings under dynamic and seismic loading. These analyses were conducted for a typical idealized pier with a single-column bent founded on a footing on the surface of, or embedded in, a layered soil profile. The report includes charts and tables for computing footing impedances for a variety of soil conditions and vibration modes. The decomposition of seismic response into kinematic and inertial parts is discussed, as are the effects of soil material nonlinearity on the response. A parameter study of the response of bridge piers (without uplift) showed the effect of increased period due to soil-structure interaction on seismic response and the influence of radiation damping. Finally, footing bearing capacity failure, development of pore water pressure, and uplift under seismic conditions are discussed.
The study described in this report examines the use of remote sensing technologies in creating building inventories for earthquake loss estimation. A key step in constructing these building inventories using remotely sensed data is to separate the built environment from the ground, i.e., the bare earth. The report describes an approach using SAR to detect the bare earth by employing a series of filters that depend on knowing the general heights of buildings, trees and other physical features on the surface of the earth. The bare-earth algorithm is validated and applied to three study regions in the Los Angeles area. The authors also investigate the efficacy of using LIDAR (light detection and ranging) data in constructing building inventories. LIDAR data is more detailed and accurate than SAR data, and the results from the two technologies were compared. The next report in this series will focus on using the results of the bare-earth algorithm to estimate the building stock.
In this research, experimental data on the behavior of concentrically braced
frames (CBF) is reviewed to assess the extent of hysteretic energy achieved by
bracing members in compression, and the extent of degradation of the compression
force upon repeated cycling loading. The response of single story buildings and
other case studies are investigated to observe trends in response and to develop
a better understanding of the impact of some design parameters on the seismic
response of CBF. This study focuses on quantifying energy dissipation in
compression and its effectiveness on seismic performance. Based on the
experimental data review from previous tests, the normalized energy dissipation
is found to decrease with increasing normalized displacements. The normalized
degradation of the compression force envelope depends on KL/r and is
particularly severe for W-shape braces. Based on dynamic analyses of a single
story braced frame, a bracing member designed with bigger R and larger KL/r
results in a lower normalized cumulative energy ratio in both cases.