Health Assessment of a Partially Collapsed Bridge Using Ground Radar (GPR) Application

Year 2022, Volume: 8 Issue: 4, 805 - 819, 15.12.2022

Gökhan Kılıç

https://doi.org/10.28979/jarnas.1089956

Abstract

Condition assessment of bridge structures within the context of health monitoring of structures, as well as the life cycle of structures, is of vital significance for engineers. Undoubtedly, the detection of bridge structural defects in the collapsed bridge in particular internal structural elements such as bridge deck delamination, the formation of cracks and corrosion of rebar will enable engineers to take necessary action, and prolong the serviceability of the structure. Applications of GPR have proved to be effective in detecting such imperfections if utilised correctly. GPR is also used in other structures. Since the GPR data was obtained in the form of two dimensional images after pro-cessing, the sections were examined in two dimensions and the reflected/scattered electromagnetic (EM) wave fields on the radargrams of the three dimensional images were examined. According to the results, the reflected/scattered wave field locations of the bridge on the processed data define the locations and depths of the structural elements. The apex width of the resulting GPR hyperbolas determines the structural elements. This paper reviews the collapse in April 2012 of a case study bridge over a creek, examining the possibility that this collapse could have been anticipated, and therefore, prevented with an adequate structural health monitoring programme. This paper also presents the results of the application of GPR. Factors which have been identified as having directly contributed to the failure of the case study bridge include the corrosion of rebar, scour of the foundations and a weakened bridge deck. The methodology implemented in this paper can be used to enhance the decision making of structural engineers and/or asset managers relating to the Ground Penetrating Radar application of corrosion affected bridges.

Keywords

Bridge, Ground Penetrating Radar, Non-destructive Technologies, Structure Health, Neural Netwrok

Yer Radarı (GPR) Uygulaması ile Kısmi Yıkılmış Bir Köprünün Sağlık Durumunun Belirlenmesi

Abstract

Köprü yapılarının sağlık durumlarının ve yapıların yaşam döngüsü bağlamında durumun değerlendirilmesi mü-hendisler için hayati öneme sahiptir. Kuşkusuz, yıkılmış köprülerdeki yapısal kusurların önceden tespit edilmesi, özel-likle yapı elamanlarındaki çatlaklar, donatıların açığa çıkması ve korozyonun tespiti, mühendislerin gerekli önlemleri alması ve yapının daha uzun süre kullanılabilirliğini sağlamaktadır. GPR uygulamalarının doğru kullanıldığı takdirde, bu gibi kusurların tespitinde etkili olduğu kanıtlanmıştır. GPR yöntemi başka yapılar içerisinde de kullanılmaktadır. GPR verileri işlendikten sonra iki boyutlu görüntüler ayrı ayrı incelenerek ve görüntülere ait radargramlar üzerinde yansımış/saçılmış elektromanyetik (EM) dalga alanları da irdelenmiştir. Sonuç olarak, işlenmiş veriler üzerindeki köprüye ait yansımış/saçılmış dalga alanı konumları, yapısal elamanların konumlarını ve derinliklerini tanımlamakta-dır. Elde edilen GPR hiperbollerin tepe genişliği yapısal elamanları belirlemektedir. Bu çalışma, Nisan 2012'de bir nehir üzerindeki köprüde meydana gelen kısmi çöküşü incelemektedir. Bu çöküşün yeterli bir yapısal sağlık izleme programı ile önlenebileceği tespit edilmiştir. İncelenen köprünün kısmi yıkılmasını doğrudan etkileyen faktörler ara-sında yapısal elamanların demir korozyonu, temellerin aşınması ve zayıflamış bir köprü döşemesi bulunmaktadır. Bu çalışmada uygulanan yöntem, korozyondan etkilenen köprülerin GPR uygulaması ile ilgili yapı mühendislerinin ve / veya sorumluların karar vermelerini geliştirmek için kullanılabilir.

Keywords

Köprü, Yer Radarı, Kazısız Teknolojiler, Yapı Sağlığı., Sinir Ağları

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