Numerical Methodology for Detection and Analysis of Potential Cracks in an Existing masonry dam Structure

Öz

Many recent studies have focused on the seismic analysis of earthfill and concrete dam structures, while research on masonry dams remains limited. The seismic response of these dams is primarily influenced by their inherently discontinuous nature, which can lead to significant responses during earthquake events. This paper presents a numerical methodology aimed at predicting earthquake-induced damage patterns in a masonry dam. It outlines the process of importing these results into finite element software and then using analytical techniques to evaluate the structural integrity of the dam in relation to the observed damage, and to investigate how this damage evolves over time. A numerical simulation using a 2D shell model has been conducted using a Finite Element (FE) model with the Extended Finite Element Method (XFEM). The FE models have been developed using non-linear time history analysis. An evaluation will compare the calculated results with existing data from the literature, including both modal analysis and stress analysis. This evaluation involves investigating primary failure mechanisms, including variations in crack and damage distribution within the masonry dam. This verification step is crucial to ensure that the simulation accurately represents the real-world phenomenon.

Anahtar Kelimeler

• Masonry Dam
• Seismic Analyses
• Finite Element
• Damage Patterns.

Mevcut Bir Yığma Baraj Yapısındaki Potansiyel Çatlakların Tespiti ve Analizi için Sayısal Metodoloji

Öz

ÖZ Son zamanlarda yapılan çok sayıda çalışma toprak dolgu ve beton baraj yapılarının sismik analizlerine odaklanırken, yığma barajlar üzerine yapılan araştırmalar sınırlı kalmıştır. Bu barajların sismik tepkisi öncelikle doğaları gereği süreksiz özelliklerinden etkilenmektedir. Bu nitelik, deprem olayları sırasında önemli reaksiyonlara neden olabilir. Bu makale, yığma bir barajda depremin neden olduğu hasar modellerini tahmin etmeyi amaçlayan sayısal bir metodoloji sunmaktadır. Bu sonuçların sonlu elemanlar yazılımına aktarılması ve ardından barajın yapısal bütünlüğünü gözlemlenen hasarlarla ilişkili olarak değerlendirmek ve bu hasarların zaman içinde nasıl geliştiğini araştırmak için analitik tekniklerin kullanılması süreci özetlenmektedir. Genişletilmiş Sonlu Elemanlar Yöntemi (XFEM) kullanan bir Sonlu Elemanlar (FE) modeli kullanılarak 2 boyutlu bir kabuk modeli ele alınarak sayısal bir simülasyon gerçekleştirilmiştir. FE modelleri doğrusal olmayan zaman-tarih analizleri kullanılarak gerçekleştirilmiştir. Hesaplanan sonuçları literatürdeki mevcut verilerle karşılaştırmak için bir değerlendirme yapılmıştır. Bu değerlendirme hem modal analizi hem de gerilme analizini kapsar ve yığma baraj içindeki çatlak ve hasar dağılımındaki değişimler de dahil olmak üzere birincil hasar mekanizmalarının incelenmesini içerir. Bu doğrulama adımı, simülasyonun gerçek dünya fenomenini doğru bir şekilde temsil ettiğinden emin olmak için çok önemlidir.

Anahtar Kelimeler

• Yığma Baraj
• Sismik Analizler
• Sonlu Elemanlar
• Hasar Örüntüleri.

Kaynakça

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