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
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
Response study of the tallest California building inferred from the Mw7.1 Ridgecrest, California earthquake of 5 July 2019 and ambient motions
Significant seismic behavior features of two tall buildings inferred from response records
Joint system-input identification of bridge structures
The behavior of the Salesforce Tower, the tallest building in San Francisco, California inferred from earthquake and ambient shaking
On the utilization of synthetic and measured earthquake ground motions for designing building monitoring systems in the near-field of major faults
The behavior of the Salesforce Tower, the tallest building in San Francisco, California inferred from earthquake and ambient shaking
Responses of the odd couple Carquinez, CA, suspension bridge during the Mw6.0 south Napa earthquake of August 24, 2014
Highlights of a cursory study of behavior of three instrumented buildings during the Mw7.1 Anchorage, Alaska, earthquake of November 30, 2018
S2HM of buildings in USA
Quantifying the effect of beating inferred from recorded responses of tall buildings
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Seismic 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 TacirogluResponse study of the tallest California building inferred from the Mw7.1 Ridgecrest, California earthquake of 5 July 2019 and ambient motions
The newly constructed tallest building in California, the 73-story Wilshire Grand in Los Angeles, California, is designed in conformance with performance-based design procedures. 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 structural systems. The building is equipped with aAuthorsMehmet Çelebi, S. Farid Ghahari, Hamid Haddadi, Ertugrul TacirogluSignificant seismic behavior features of two tall buildings inferred from response records
In this paper, recent studies of recorded responses of behavior and performances of two instrumented tall buildings subjected to long-period motions from events that originate at far distances (e.g. 100-800km) are presented. Significant results indicate that (a) computed average drift ratios are substantial (~0.5%), and (b) there is permanent shift of fundamental frequencies for a tall building whAuthorsMehmet ÇelebiJoint system-input identification of bridge structures
This paper presents a novel framework for system identification of bridge structures using recorded earthquake data. Bridge structures are prone to spatial variability of ground motions because they extend over relatively long distances. So, input motion measurement is a challenging task, especially for long bridges with multiple piers. Moreover, direct measurement of the bridge Foundation Input MAuthorsS. F. Ghahari, Mehmet Çelebi, H. Ebrahimian, Barbaros Cetiner, E. TacirogluThe behavior of the Salesforce Tower, the tallest building in San Francisco, California inferred from earthquake and ambient shaking
The newly constructed tallest building designed in conformance with performance-based design procedure in San Francisco, California is a 61-story building equipped with an accelerometric array that recorded the January 4, 2018 M4.4 Berkeley earthquake. The building is designed with concrete core shear walls and perimeter gravity steel columns. The earthquake records as well as on-demand recorded aAuthorsMehmet Çelebi, H. Haddadi, Moh Huang, Michael Valley, John Hooper, Ron KlemencicOn the utilization of synthetic and measured earthquake ground motions for designing building monitoring systems in the near-field of major faults
Agencies and research groups engaged in studying measures for enhancing the resiliency of communities have recently placed emphasis on the need for extensive implementation of monitoring systems for rapid post-event assessment of structural integrity. Designing a monitoring system for a building requires a thorough knowledge of its potential nonlinear dynamic behavior with an associated localizatiAuthorsFloriana Petrone, David McCallen, Mehmet ÇelebiThe behavior of the Salesforce Tower, the tallest building in San Francisco, California inferred from earthquake and ambient shaking
The newly constructed tallest building designed in conformance with performance-based design procedure in San Francisco, California is a 61-story building equipped with an accelerometric array that recorded the January 4, 2018 M4.4 Berkeley earthquake. The building is designed with concrete core shear walls and perimeter gravity steel columns. The earthquake records as well as on-demand recorded aAuthorsMehmet Çelebi, Hamid Haddadi, Moh Huang, Michael Valley, John Hooper, Klemencic. RonResponses of the odd couple Carquinez, CA, 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. Utilizing data from an extensive array of accelerometers that recorded the earthquake-excited motions, dynamic characteristics such as modes, corresponding frequencies and damping are identified and compared with previous studies that used ambient data of the deck only plusAuthorsMehmet Çelebi, S. Farid Ghahari, Ertugrul TacirogluHighlights of a cursory study of behavior of three instrumented buildings during the Mw7.1 Anchorage, Alaska, earthquake of November 30, 2018
This is a cursory study of the recorded responses of three buildings instrumented by the U.S. Geological Survey (USGS) in Anchorage, Alaska, during the MwMw 7.1 earthquake of 30 November 2018. The earthquake caused the strongest shaking in Anchorage since the well‐known 1964 MwMw 9.2 Great Alaska earthquake. Since the 1964 event, several structures (buildings and bridges) in Anchorage have been inAuthorsMehmet ÇelebiS2HM of buildings in USA
The evolution of seismic structural-health monitoring (S2HM) of buildings in the USA is described in this chapter, emphasizing real-time monitoring. Rapid and accurate assessment of post-earthquake building damage is of paramount importance to stakeholders (including owners, occupants, city officials, and rescue teams). Relying merely on rapid visual inspection could result in serious damage beingAuthorsMehmet ÇelebiQuantifying the effect of beating inferred from recorded responses of tall buildings
The beating phenomenon observed in recorded earthquake responses of a tall building in Japan and of two others buildings in the U.S. are examined in this paper. The objective of the paper is to discuss the significance of beating and to estimate what percentage of total shaking energy impacting a building is contributed by beating when it occurs. Beating is prominent in the prolonged resonant respAuthorsMehmet Çelebi - News