Yer Tepki Analizlerinde Farklı Dinamik Kayma Modülü Yaklaşımları Kullanılarak Belirlenen Tepki Spektrumlarının Karşılaştırılması

Deprem kaynaklı dinamik hareketlerin zemin içerisindeki dalga yayılımına bağlı olarak altyapı ve üstyapı sistemlerinde oluşturduğu etkilerin araştırılmasında kullanılan araçlardan biri tek boyutlu yer tepki analizleridir. Bu analizlerde zeminlerin dinamik özelliklerinin tanımlanmasında doğrudan çevrimsel yüklemeler ile gerçekleştirilen deneyler kullanılabilmektedir. Fakat bu deneylerin maliyetleri ve deney aletlerinin ulaşılabilirliğindeki zorluklar nedeniyle bu deneylerin yerine genellikle araştırmacılar tarafından geliştirilen modül azalım ve sönüm eğrileri kullanılmaktadır. Eğrilerin farklı veri setleri ve teknolojilere sahip deney aletleri ile hazırlanması, zeminin dinamik etkiler altındaki davranışlarında farklılıklara sebep olmaktadır. Literatürde bu farklılıkların giderilmesi konusunda çeşitli düzeltme parametreleri geliştirilmiştir. Fakat düzeltme parametrelerine rağmen eğrilerin birbiri ile tam uyumlu olduğundan bahsetmek mümkün değildir. Bu çalışmada dinamik davranış eğrileri ile elde edilen sonuçlar, bir vaka kapsamında incelenmiş ve değerlendirilmiştir. Dinamik eğrilerin yer tepki analizi ile elde edilen zemin davranış çıktılarına etkisi karşılaştırmalı olarak değerlendirilmiştir. Değerlendirmeler neticesinde yüzeye yakın killi zeminlerde dinamik kayma modülü etkilerinin uyumlu olduğu belirlenmiştir. Kumlu zeminler için ise tespit edilen uyumsuzluklar nedenleri ile birlikte açıklanmıştır.

Anahtar Kelimeler:

Yer tepki analizi, Modül azalım eğrileri, Deprem tepki spektrumu, Malzeme sönüm eğrileri

Comparison of Response Spectrums Determined Using Different Dynamic Shear Modulus Approaches in Ground Response Analysis

One of the methods used to investigate the effects of earthquake-induced dynamic movements on substructure and superstructure is one-dimensional ground response analysis. In these analyzes, tests performed with direct cyclic loading can be used to define the dynamic properties of soils. However, due to the cost of these experiments and the difficulties in accessibility of the test equipment, modulus reduction and damping curves developed by the researchers are generally used instead of these experiments. The preparation of these curves with test tools with different data sets and technologies causes differences in the behavior of the soil under dynamic effects. Various correction parameters have been developed in the literature to eliminate these differences. However, despite these correction parameters, it is not possible to say that the curves are fully compatible with each other. In this study, the results obtained with dynamic behavior curves were examined and evaluated within the scope of a case. The effect of dynamic response curves used in ground response analysis on soil response outputs has been evaluated comparatively. As a result of the evaluations, it has been determined that the dynamic shear modulus effects are compatible in clayey soils close to the surface. But for sandy soils, inconsistencies were determined and the detected incompatibilities were explained with their reasons.

Keywords:

Ground Response Analysis, Modulus Reductuion Curves, Earthquake Response Spectrum, Material Damping Curve,

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