Mehmet Celebi
Mehmet Çelebi is a Research Civil Engineer with the Earthquake Science Center.
Mehmet Çelebi received his BSc degree in Civil Engineering in 1964 from Middle East Technical University [METU] (Ankara, Turkey), MSc, degree in Civil Engineering in 1965 from Stanford University and PhD degree in Civil/Structural Engineering in 1968 from Mc Gill University (Montreal, Canada). He taught in METU as Assistant and Associate Professor (1969-1977), as tenured Professor in San Francisco State University (1981-84), He also worked in industry as Principal Engineer and Specialist in Engineering Decision Analyses Co (Palo Alto, CA) and Bechtel Power Corporation (San Francisco, CA) between 1977-1981). He joined USGS in 1984 as a research Civil Engineer where he was assigned, championed and led in efforts in seismic structural monitoring of structures and related research. In addition, as a USGS researcher and/or EERI post-earthquake studies team-member, he participated in numerous national and international post-earthquake reconnaissance studies as well as field work. These include but are not limited to: 1985 Valparaiso (Chile), 1985 Michoacan (Mexico), 1987 Whittier-Narrows (CA), 1989 Loma Prieata (CA), 1992 Erzincan Turkey), 1994 Northridge (CA), 1995 Kobe (Japan), 1999 Izmit (Turkey), 2010 Maule (Chile), 2011 Tohoku (Japan), 2016 Cushing (OK) earthquakes and participated in related research and technical reports.
In 2000-2006 period, utilizing GPS units and accelerometers with real-time response measurements, his publications include pioneering studies Structural Health Monitoring (SHM) using threshold drift ratios in establishing occupationabilty of buildings subjected to severe shaking events. Since 2010, Dr. Çelebi has concentrated on analyses of recorded responses of tall buildings during strong and ambient shaking. Such studies has contributed to data bases that establish recommendations for (a) minimum seismic monitoring required for tall buildings, (b) dynamic characteristics such as fundamental structural periods and critical damping percentages, (c) analyses methods to extract building specific characteristics and (d) assessing damage condition of the buildings from recorded data. He has co-edited a recent book on Seismic Structural Health Monitoring and published more than 230 technical papers, books, reports, conference papers.
Science and Products
The 19 September 2017 M 7.1 Puebla‐Morelos earthquake: Spectral ratios confirm Mexico City zoning
U.S. Geological Survey National Strong-Motion Project strategic plan, 2017–22
Before and after retrofit behavior and performance of a 55-story tall building inferred from distant earthquake and ambient vibration data
Before and after retrofit behavior and performance of a 55-story tall building inferred from distant earthquake and ambient vibration data
Study of responses of 64-story Rincon Building to Napa, Fremont, Piedmont, San Ramon earthquakes and ambient motions
Responses of a 64-story unique San Francisco, CA. building to four earthquakes and ambient motions
Evaluation of performance of Taiwan housing stock and schools during the Mw6.4 Kaohsiung/Meinong Earthquake of February 6, 2016
Responses of a 58-story RC dual core shear wall and outrigger frame building inferred from two earthquakes
Learning from the recent Taiwan Meinong Earthquake
Responses of a tall building in Los Angeles, California as inferred from local and distant earthquakes
Significance of beating observed in earthquake responses of buildings
An investigation of soil-structure interaction effects observed at the MIT Green Building
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The 19 September 2017 M 7.1 Puebla‐Morelos earthquake: Spectral ratios confirm Mexico City zoning
One important element of understanding basin response to strong shaking is the analysis of spectral ratios, which may provide information about the dominant frequency of ground motion at specific locations. Spectral ratios computed from accelerations recorded by strong‐motion stations in Mexico City during the mainshock of the 19 September 2017 MM 7.1 Puebla‐Morelos earthquake reveal predominate pAuthorsMehmet Çelebi, Valerie Jean Sahakian, Diego Melgar, Luis QuintanarU.S. Geological Survey National Strong-Motion Project strategic plan, 2017–22
The mission of the National Strong-Motion Project is to provide measurements of how the ground and built environment behave during earthquake shaking to the earthquake engineering community, the scientific community, emergency managers, public agencies, industry, media, and other users for the following purposes: Improving engineering evaluations and design methods for facilities and systems;ProviAuthorsBrad T. Aagaard, Mehmet Çelebi, Lind Gee, Robert Graves, Kishor Jaiswal, Erol Kalkan, Keith L. Knudsen, Nicolas Luco, James Smith, Jamison Steidl, Christopher D. StephensBefore and after retrofit behavior and performance of a 55-story tall building inferred from distant earthquake and ambient vibration data
A sparsely instrumented 55-story building in Osaka, Japan had recorded unprecedented, severe and long-duration long-period resonating responses during the March 11, 2011 M9.0 Tohoku earthquake that occurred at 767 km distance. Thereafter, studies of the records resulted in implementation of a significant retrofit design, comprising dampers and buckling restrained braces (BRBs). The responses of thAuthorsMehmet Çelebi, Toshihide Kashima, S. Farid Ghahari, Shin Koyama, Ertuğrul Taciroğlu, Izuru OkawaBefore and after retrofit behavior and performance of a 55-story tall building inferred from distant earthquake and ambient vibration data
A sparsely instrumented 55-story building in Osaka, Japan, had recorded unprecedented, severe, and long-duration, long-period resonating responses during the 11 March 2011 M9.0 Tohoku earthquake that occurred at 767 km distance. Thereafter, studies of the records resulted in the implementation of a significant retrofit design, comprising dampers and buckling restrained braces (BRBs). The responsesAuthorsMehmet Çelebi, Toshihide Kashima, S. F. Ghahari, Shin Koyama, Ertugrul Tacirogle, Izuru OkawaStudy of responses of 64-story Rincon Building to Napa, Fremont, Piedmont, San Ramon earthquakes and ambient motions
We analyze the recorded responses of a 64-story, instrumented, concrete core shear wall building in San Francisco, California, equipped with tuned sloshing liquid dampers (TSDs) and buckling restraining braces (BRBs). Previously, only ambient data from the 72-channel array in the building were studied (Çelebi et al. 2013). Recently, the 24 August 2014 Mw 6.0 Napa and three other earthquakes were rAuthorsMehmet Çelebi, John Hooper, Ron KlemencicResponses of a 64-story unique San Francisco, CA. building to four earthquakes and ambient motions
We analyze the ambient and earthquake responses of a 64-story, instrumented, concrete core shear wall building in San Francisco, Calif. equipped with tuned sloshing liquid dampers (TSDs) and buckling restraining braces (BRBs). In an earlier paper [1], only ambient data were used to identify dynamic characteristics. Recently, the 72-channel instrumental array of the building recorded the 24 AugustAuthorsMehmet Çelebi, J. Hooper, Ron KlemencicEvaluation of performance of Taiwan housing stock and schools during the Mw6.4 Kaohsiung/Meinong Earthquake of February 6, 2016
The recent Kaohsiung Meinong Earthquake which occurred on February 6, 2016 affected several categories of building stock for which risk identification programs were previously developed by NCREE. A typical building type in the city of Tainan is a mixed-use three-to-five-story structure. The ground floor of this typical structure is an open-front commercial or manufacturing space, which is laterallAuthorsRamon Gilsanz, Cathy Huang, Jessica Mandrick, Joe Mugford, Shyh-Jiann Hwang, Tsung-Chih Chiou, Mehmet ÇelebiResponses of a 58-story RC dual core shear wall and outrigger frame building inferred from two earthquakes
Responses of a dual core shear-wall and outrigger-framed 58-story building recorded during the Mw6.0 Napa earthquake of 24 August 2014 and the Mw3.8 Berkeley earthquake of 20 October 2011 are used to identify its dynamic characteristics and behavior. Fundamental frequencies are 0.28 Hz (NS), 0.25 Hz (EW), and 0.43 Hz (torsional). Rigid body motions due to rocking are not significant. Average driftAuthorsMehmet ÇelebiLearning from the recent Taiwan Meinong Earthquake
This paper highlights the lessons learned following a reconnaissance trip to Tainan, Taiwan two weeks after the February 2016 earthquake. The reconnaissance was conducted by Gilsanz, Murray Steficek engineers (GMS) and an earthquake engineer from the United States Geological Survey (USGS), in collaboration with the Earthquake Engineering Research Institute (EERI), the Applied Technical Council (ATAuthorsRamon Gilsanz, Cathy Huang, Jessica Mandrick, Joe Mugford, Cerea Steficek, Mehmet Çelebi, Sheng-Jhih JhuangResponses of a tall building in Los Angeles, California as inferred from local and distant earthquakes
Increasing inventory of tall buildings in the United States and elsewhere may be subjected to motions generated by near and far seismic sources that cause long-period effects. Multiple sets of records that exhibited such effects were retrieved from tall buildings in Tokyo and Osaka ~ 350 km and 770 km from the epicenter of the 2011 Tohoku earthquake. In California, very few tall buildings have beeAuthorsMehmet Çelebi, Hasan Ulusoy, Nori NakataSignificance of beating observed in earthquake responses of buildings
The beating phenomenon observed in the recorded responses of a tall building in Japan and another in the U.S. are examined in this paper. Beating is a periodic vibrational behavior caused by distinctive coupling between translational and torsional modes that typically have close frequencies. Beating is prominent in the prolonged resonant responses of lightly damped structures. Resonances caused byAuthorsMehmet Çelebi, S. F. Ghahari, E. TacirogluAn investigation of soil-structure interaction effects observed at the MIT Green Building
The soil-foundation impedance function of the MIT Green Building is identified from its response signals recorded during an earthquake. Estimation of foundation impedance functions from seismic response signals is a challenging task, because: (1) the foundation input motions (FIMs) are not directly measurable, (2) the as-built properties of the super-structure are only approximately known, and (3)AuthorsErtugrul Taciroglu, Mehmet Çelebi, S. Farid Ghahari, Fariba Abazarsa - News