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
55-Story Tall Building – Before and After Earthquake Retrofit
Quantifying modeling uncertainty in simplified beam models for building response prediction
Seismic monitoring solutions for buildings
Response study of a tall San Diego, California building inferred from the M7.1 July 5, 2019 Ridgecrest, California earthquake motions
Earthquake early warning for estimating floor shaking levels of tall buildings
Preliminary study of correlation of natural periods and damping percentages of tall buildings in several countries
Zoning Verification in Mexico City Using Strong Motions of the M7.1 Puebla-Morelos Earthquake of September 19, 2017
Responses of the Carquinez, California suspension bridge during the MW6.0 South Napa earthquake of August 24, 2014
Response of an asymmetrical five-story building in Fairbanks, Alaska during the November 30, 2018 M7.1 Anchorage, Alaska earthquake
Response study of a 51-story-tall Los Angeles, California building inferred from motions of the Mw7.1 July 5, 2019 Ridgecrest, California earthquake
S2HM must be real-time or not?
Seismic response of a typical shear-wall dominated high-rise condominium building during the January 7, 2020 Mw6.4 Indios, Puerto Rico earthquake
Response of the tallest California building during the Mw7.1 July 5, 2019 Ridgecrest, California earthquake
Science and Products
- Science
55-Story Tall Building – Before and After Earthquake Retrofit
Release Date: MARCH 26, 2018 A building in Japan was analyzed before and after a seismic retrofit to make it more resilient to shaking. - Publications
Filter Total Items: 98
Quantifying modeling uncertainty in simplified beam models for building response prediction
The use of simple models for response prediction of building structures is preferred in earthquake engineering for risk evaluations at regional scales, as they make computational studies more feasible. The primary impediment in their gainful use presently is the lack of viable methods for quantifying (and reducing upon) the modeling errors/uncertainties they bear. This study presents a Bayesian caAuthorsS. Farid Ghahari, Khachik Sargsyan, Mehmet Çelebi, Ertugrul TacirogluSeismic monitoring solutions for buildings
This chapter introduces seismic monitoring of structural systems for buildings and begins with a historical background of this topic in the United States. After providing the historical context, the chapter reviews common seismic instrumentation issues such as utilization of data, code versus extensive instrumentation, free-field instrumentation, record synchronization requirements and more. RecenAuthorsMehmet Çelebi, Yavuz KayaResponse study of a tall San Diego, California building inferred from the M7.1 July 5, 2019 Ridgecrest, California earthquake motions
The shaking of a new 24-story tall building in San Diego, California, was recorded by its seismic monitoring array during the M7.1 Ridgecrest, California earthquake of July 5, 2019. The building is located ~340 km from the epicenter of the event. The building is a special moment framed (SMF) steel structure with reduced beam sections (RBS) and viscous damper systems (DS). Peak accelerations recordAuthorsMehmet Çelebi, Daniel SwensenEarthquake early warning for estimating floor shaking levels of tall buildings
This article investigates methods to improve earthquake early warning (EEW) predictions of shaking levels for residents of tall buildings. In the current U.S. Geological Survey ShakeAlert EEW system, regions far from an epicenter will not receive alerts due to low predicted ground‐shaking intensities. However, residents of tall buildings in those areas may still experience significant shaking dueAuthorsS. Farid Ghahari, Annemarie S. Baltay, Mehmet Çelebi, Grace Alexandra Parker, Jeffrey McGuire, Ertugrul TacirogluPreliminary study of correlation of natural periods and damping percentages of tall buildings in several countries
Fundamental periods (T) and critical damping percentages (ζ) of 41 tall buildings in several countries form the basis of this preliminary study. Correlation between building height and fundamental period for steel and reinforced concrete buildings clearly shows a linear variation but with a large standard deviation, most likely due to considerable variation in the designs of structural systems. NoAuthorsMehmet ÇelebiZoning Verification in Mexico City Using Strong Motions of the M7.1 Puebla-Morelos Earthquake of September 19, 2017
Mexico City suffers extensive damage from large earthquakes that originate at far distances due mainly to densely built areas on a filled lakebed. Seismic design codes in Mexico recognize the site-specific issues in Mexico City by acknowledging zones that represent lakebed as being riskier compared to other Mexico City areas. At the time of the 19 September 1985 M8.1 Michoacán Earthquake, (a) theAuthorsMehmet Çelebi, Valerie J. Sahakian, Diego Melgar, Luis QuintanarResponses of the Carquinez, California suspension bridge during the MW6.0 South Napa earthquake of August 24, 2014
The behavior of the suspension bridge in Carquinez, CA, during the Mw6.0 24 August 2014 South Napa, CA earthquake is studied using data recorded by an extensive array of accelerometers. Modes, corresponding frequencies and damping are identified and compared with previous studies that used ambient data of the deck only plus mathematical models. Data are systematically analyzed for vertical, transvAuthorsMehmet Çelebi, S. F. Ghahari, E. TacirogluResponse of an asymmetrical five-story building in Fairbanks, Alaska during the November 30, 2018 M7.1 Anchorage, Alaska earthquake
A recently constructed, five-story, asymmetrical steel building on the campus of the University of Alaska, Fairbanks was equipped with a strong-motion array that recorded the M7.1 Anchorage earthquake of November 30, 2018 at an epicentral distance of 408 km. The largest recorded peak accelerations at the basement and top of the building are 0.021g and 0.071g, respectively. The steel building is deAuthorsMehmet Çelebi, Natalia RuppertResponse study of a 51-story-tall Los Angeles, California building inferred from motions of the Mw7.1 July 5, 2019 Ridgecrest, California earthquake
A 51-story building in downtown Los Angeles that is equipped with a seismic monitoring accelerometric array recorded the Mw7.1 Ridgecrest, California earthquake of July 5, 2019. The building is a dual-core reinforced-concrete shear-wall and perimeter-column structure with ~ 80% of floors constructed as post-tensioned flat slabs, which makes it a trending design. Using system identification methodsAuthorsMehmet Çelebi, Dan Swensen, Hamid HaddadiS2HM must be real-time or not?
Seismic structural health monitoring (S2HM) has advanced significantly in the last three decades. However, currently there is no consensus on the need for real-time processing of data acquired during an earthquake. Numerous applications exist whereby S2HM-equipped systems record valuable seismic response data. A delayed use of the seismic data prohibits timely discovery of hidden damages in a struAuthorsMehmet Çelebi, Maria LimongelliSeismic response of a typical shear-wall dominated high-rise condominium building during the January 7, 2020 Mw6.4 Indios, Puerto Rico earthquake
Seismic response records were retrieved from the monitored 21-story (53.26-m-tall) typical Puerto Rican reinforced-concrete shear-wall dominated El Castillo Building in Mayaguez, 50 km from the mainshock epicenter of the January 7, 2020, Mw6.4 offshore Indios, Puerto Rico earthquake. The shear-wall-to-floor areas of the building are 0.97 and 3.49 in the longitudinal and transverse directions, respAuthorsMehmet Çelebi, Eduardo Miranda, Jose A. Martinez-CruzadoResponse of the tallest California building during the Mw7.1 July 5, 2019 Ridgecrest, California earthquake
The 73-story Wilshire Grand in downtown Los Angeles is the recently constructed tallest building in California. It is designed in conformance with performance-based design procedures. The lateral load resisting system of the building is designed with concrete core shear walls, three outriggers with buckling restrained braces (BRBs) located along the height and two three-story truss-belt structuralAuthorsMehmet Çelebi, S. F. Ghahari, Hamid Haddadi, Ertugrul Taciroglu