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New MCEER Technical Reports

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

Assessment of Performance of Bolu Viaduct in the 1999 Duzce Earthquake in Turkey 
By P.C. Roussis, M.C. Constantinou, M. Erdik, E. Durukal and M. Dicleli, 5/8/02, MCEER-02-0001, 140 pages, $25.00

This report describes the impact of the destructive 1999 Duzce (Turkey) earthquake on the Bolu Viaduct, a 2.3-km long seismically isolated structure which was essentially complete when the earthquake occurred. The viaduct suffered a complete failure of its seismic isolation system and narrowly avoided total collapse due to excessive differential ground, substructure, and superstructure movement. The report presents an evaluation of the design of the seismic isolation system of this structure and an assessment of its performance in the Duzce earthquake. The evaluation of design and assessment of performance are important in developing experience in the design of seismically isolated structures and in validating analysis and design specifications.

Seismic Behavior of Rail Counterweight Systems of Elevators in Buildings
by Mahendra Pal Singh, Rildova and Luis E. Suarez, 5/27/02, MCEER-02-0002, 216 pages, $35.00

The study described in this report focused on the seismic performance of elevator systems. The report begins with an overview of elevator systems used in buildings, including various components of the system and their functions. From the standpoint of seismic performance, the rail-counterweights are the most vulnerable components of the system. Current code procedures used for the design of the rail and guidance system are provided, as is a survey of available literature on the seismic response and performance evaluation of elevator systems. The authors develop simple linear and more realistic nonlinear models to evaluate the seismic performance of the rail-counterweight system. The linear model provides a convenient tool for a preliminary study of the system to provide valuable insight into the dynamic behavior; it can also be conveniently used to examine protective options to improve seismic performance of the system. The nonlinear model, on the other hand, is necessary to study the performance of the system under more realistic seismic conditions. A comprehensive parametric study is conducted to evaluate the effect of various parameters on the seismic response of the system.

The analytical models and approach described in the report will aid in seismic evaluation of hospitals equipped with elevators for vertical transportation. This study will also help the designers and manufacturers of the elevator systems understand why elevators behave as they do in earthquakes and will help them to evaluate the modification and design changes that may be necessary to improve their seismic performance.

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