Field Applications For Risk Assessment Methods of Urban Transformation Law No. 6306: A Case Study Of Beyoğlu

Year 2018, Volume: 4 Issue: 2, 54 - 64, 01.12.2018

Ozgur Anıl , Mustafa Kerem Koçkar Mustafa Şahmaran

Abstract

One of the most important
risks in Turkey is the high seismic activity in the region. Therefore,
identification of high risk structure inventory under earthquake conditions as
a priority and reinforcement or demolishing/renovation within the scope of disaster
risk planning is a priority subject. In this respect, Law no. 6306 of
Transformation of Areas under the Disaster Risks and issued in 2013 includes
highly important information and methodology regarding identification of risk
level for either individual structures of or an area including numerous
structures. The first of the methodology included in the appendices of the
application instructions of this law describes regulations on identification of
risk level of an individual structure and the second methodology regarding
prioritization of risk level via expedited assessment of numerous structures
within an area/region. Increase in probability of occurrence of an earthquake
in cities such as Istanbul where numerous structures exist increases the
necessity of conducting rapid assessment of earthquake risk of numerous
structures and conducting necessary studies required for planning of renewal at
regions where level of risk is higher. One of the most important risks in
Turkey is the high seismic activity in the region. Therefore, identification of
high risk structure inventory under earthquake conditions as a priority and
reinforcement or demolishing/renovation within the scope of disaster risk
planning is a priority subject. In this respect, the Regulation on the
Implementation of Law no. 6306 includes highly important information and
methodology regarding identification of risk level for either individual
structures of or an area including numerous structures. The first of the
methodology included in the appendices of the application instructions of this
law describes regulations on identification of risk level of an individual
structure and the second methodology regarding prioritization of risk level via
expedited assessment of numerous structures within an area/region. Increase in
probability of occurrence of an earthquake in cities such as Istanbul where
numerous structures exist increases the necessity of conducting rapid
assessment of earthquake risk of numerous structures and conducting necessary
studies required for planning of renewal at regions where level of risk is
higher. For this purpose, it is necessary to correlate the assessment
methodologies of individual structures and of many structures in a rapid manner
as explained in the Regulation on the Implementation of Law no. 6306 for
studies of assessment of risk level for these areas and of prioritization.
Therefore, in this study a new method is formed and proposed herein which
combines the application of these two methodologies. This new methodology is
applied at total of 5561 structures located in 6 different neighbourhoods of
Okmeydanı region of Beyoğlu district (i.e., Fetihtepe, Kaptanpaşa, Keçeci Piri,
Kulaksız, Piri Paşa and Piyale neighbourhoods) and one of the most
comprehensive studies on application of the Law has been conducted. The method
is developed as a general methodology that can be applied to identify risk
status of any region based on superstructure distribution. The methodology
supports the rapid assessment and detailed assessment methodologies given
respectively in “Annex-A” and Annex-2 of the Regulation on the Implementation
of the applicable law, and set forth based on scientific literature.

Keywords

Assessment of earthquake risk, Rapid assessment, Prioritization, İstanbul

References

• Boore K.M., Joyner W.B., Fumal T.E., 1997, “Equations for Estimating Horizontal Response Spectra and Peak Acceleration from Western North American Earthquakes: A Summary of Recent Work”, Seism. Res. Lett., Vol. 68, No1, pp.128-153.
• BSSC, 1997, NEHRP Provisions for Seismic Regulations for New Buildings and Other Structures 1997 Edition, Part 1: Provisions, FEMA 302, Federal Management Agency.
• Campbell K.W., 1997, “Empirical Near-Source Attenuation Relationships for Horizontal and Vertical Components of Peak Ground Acceleration, Peak Ground Velocity, and Pseydo-Absolute Acceleration Response Spectra”, Seism. Res. Lett., Vol. 68, No.1, pp.154-179.
• Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmenlik (DBYBHY), 2007. In Turkish.
• Pacific Consultants International and OYO Corporation, 2002, The Study on A Disaster Prevention / Mitigation Basic Plan in Istanbul Including Microzonation in The Republic of Turkey, Final Report, Japan International Corporation Agency (JICA) and İstanbul Metropolitan Municipality (İMM), 655 s.
• Riskli Yapıların Tespit Edilmesine İlişkin Esaslar, 6306 Sayılı Kanunun Uygulama Yönetmeliği, Resmi Gazete, 2/7/2013-28695, EK-2, T.C. Çevre ve Şehircilik Bakanlığı, 2013. In Turkish
• Spedich P., Joyner W.B., Lindth A.G., Boore D.M., Magraris B.M., Fletcher J.B., 1999, “SEA99: A Revised Ground Motion Prediction Relation for Use in Extensional Tectonic Regimes”, Bull. Seism. Soc. Am., Vol 89, No. 5.
• Wald D.J., Quitoriano V., Heaton T.H., Kanamori H., Scrivner C.W., and Worden C.B., 1999, “Trinet ShakeMaps: Rapid Generation of Peak Ground Motion and Intensity Maps for Earthquakes in Southern California”, Earthquake Spectra, Vol. 15, No. 3., pp. 537-555.