Determination to the period of a school building before and after its retrofitting using ambient vibration records

Year 2022, Volume: 6 Issue: 2, 156 - 160, 15.04.2022

Selçuk Kaçın , Halil Çağrı Yılmaz , Cemil Çağlar

https://doi.org/10.31127/tuje.873050

Abstract

Determining the dynamic parameters of the structures allows us to obtain a substantial amount of information about the state of the building. Recently, the determination of these parameters were performed through Structural Health Monitoring Systems (SHMSs), which are non-destructive methods. In scope of this study, the period values prior to and following the retrofitting of a school building, which are among the dynamic parameters, were examined. The Operational Modal Analysis (OMA) method, which is based on the principle of measuring the responses of ambient effects in the structure in the experimental study, has been utilized. For this purpose, response records taken from the building under the effect of ambient vibration were used. Before and after retrofitting, the records of the building under the effect of ambient vibration were taken from the same locations. 3 sensors were used to record ambient vibrations. The data from these sensors were transferred to a computer by using a data logger. In order to measure and evaluate the responses Enhanced Frequency Domain Decomposition Method (EFDDM) in the frequency domain and Stochastic Subspace Identification Method (SSIM) in the time domain were used. Following the analysis, a comparison of how the period values had changed was conducted.

Keywords

SHMSs, Retrofitting, Dynamic Analysis, Ambient Vibration Records, OMA

References

• Bayraktar A, Turker T, Sevim B, Altunisik A C & Yildirim F (2009) Modal Parameter Identification of Hagia Sophia Bell-tower via Ambient Vibration Test. Journal of Nondestructive Evaluation. Brincker R, Zhang L & Andersen P (2000). Modal Identification from Ambient Responses using Frequency Domain Decomposition. In Proceedings of the 18th IMAC. San Antonio, Texas.
• Bru D, Ivorra S, Baeza F J, Reynau R & Foti D (2015). OMA dynamic identification of a masonry chimney with severe cracking condition. 6th International Operational Modal Analysis Conference (IOMAC15), Gijon, Spain,
• Celebi M & Liu H P (1998).Before and after retrofit response of a building during ambient and strong motions. Journal of Wind Engineering and Industrial Aerodynamics, 77&78: 259-268.
• Diaferio M, Foti D & Sepe V (2007). Dynamic Identification of the Tower of the Provincial Administration Building, Bari, Italy. Proc. of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing, Malta,, p. 21. DOI:10.4203/ccp.86.2
• Ewins D J (1995) Modal Testing: Theory and Practice. Wiley, NewYork. ISBN : 978-0-863-80218-8
• Federal Emergency Management Agency, FEMA, 306 (1999) “Manual, B.P. Evaluation of earthquake damaged concrete and masonary wall buıldings.”
• Gunes S & Anil O (2017). Operasyonel Modal Analiz Tekniği ile Yığma Yapıların Dinamik Davranışının Belirlenmesi . 4.UDMSK, 4. Uluslararası Deprem Mü- hendisliği ve Sismoloji Konferansı.
• Kacin S, Bikce M, Genes M C, Doganay Ela & Unlusoy U (2011). Güçlendirme uygulaması yapılan bir binanın güçlendirme öncesi ve sonrasında titreşim ölçümleri ile bazı dinamik parametrelerinin hesaplanması. Yedinci Ulusal Deprem Mühendisliği Konferansı İstanbul: İstanbul Teknik Üniversitesi.
• Maia J M & Silva J M (1997). Theoretical and Experimental Modal Analysis. Taunton, Somerset, England: New York: Research Studies Pre.
• Mirtaheri M & Salehi F (2018). Ambient vibration testing of existing buildings: experimental, numerical and code provisions. Advances in Mechanical Engineering, 10(4), 1687814018772718.https://doi.org/10.1177/1687814018772718
• Motosaka M, Sato T & Yamamoto Y (2004). The amplitude dependent dynamic characteristics of an existing building before and after seismic retrofit. Proc. 13th World Conf. on Earthquake Engineering, Paper No: 1023, August 1-6, Vancouver, Canada.
• Safak E (2007). Yapı Titreşimlerinin İzlenmesi: Nedir, Neden Yapılır, Nasıl Yapılır, ve Ne Elde Edilir? Altıncı Ulusal Deprem Mühendisliği Konferansı (ss. 285-293). İstanbul: İstanbul Teknik Üniversitesi
• Shokravi H, Shokravi H, Bakhary N, Rahimian Koloor S S, & Petrů M (2020). Health monitoring of civil infrastructures by subspace system identification method: an overview. Applied Sciences, 10(8), 2786. https://doi.org/10.3390/app10082786
• Shokravi H, Shokravi H, Bakhary N, Heidarrezaei M, Rahimian Koloor S S & Petrů M (2020). Application of the Subspace-Based Methods in Health Monitoring of Civil Structures: A Systematic Review and Meta-Analysis. Applied Sciences, 10(10),3607.https://doi.org/10.3390/app10103607
• Singh H & Grip N (2019). Recent trends in operation modal analysis techniques and its application on a steel truss bridge.
• Structural Vibration Solutions (SVS). 2010. ARTeMIS Extractor 2010. Copenhagen, Denmark: Aalborg University/SVS A/S. Available at: http://www.svibs.com
• SAP2000. Linear and nonlinear static and dynamic analysis and design of three-dimensional structures. Berkeley (CA), Computers and Struc-tures Inc. (CSI). 2015.
• Turkish Building ‎Earthquake Code (TBEC-2018), Afet ve Acil Durum Yönetimi Başkanlığı, Resmi Gazete, Sayı: 30364 (Mükerrer), 18 Mart 2018
• Takada T, Iwasaki R, An D D, Itoi T & Nishikawa N (2004). Dynamic Behavior Change of Building Before and After Seismically Retrofitting. Proc. 13th World Conf. on Earthquake Engineering, Paper No: 1237, August 1-6, Vancouver, Canada.
• Van Overschee P & De Moor B (1993). Subspace algorithms for the stochastic identification problem. Automatica, 29(3), 649–660.
• Zhu Y C, Xie Y L, Au S K (2018). Operational modal analysis of an eight-storey building with asynchronous data ıncorporating multiple setup, Engineering Structures, 165, 50-62