Yüzey Dalgası Analizi ile Elde Edilen Kayma Dalgası Hızlarına Dayalı Zemin Tepki Analizleri ile Hesaplanan Transfer Fonksiyonlarının HVSR Eğrileri ile Karşılaştırılması

Abstract

Bu çalışmada, yüzey dalgası analizi yöntemleri (MASW ve Remi) ile elde edilen kayma dalgası hızı (Vs) profillerine dayanılarak gerçekleştirilen bir boyutlu (1B) lineer zemin tepki analizlerinden elde edilen transfer fonksiyonlarının, aynı lokasyonda kaydedilmiş ivme ve gürültü kayıtlarından hesaplanan yatay/düşey spektral oran (HVSR) eğrileri ile frekans düzleminde karşılaştırılması amaçlanmıştır. Çalışma kapsamında, zemin tepki analizinde girdi hareketi olarak bölgesel deprem kayıtlarının ivme değerlerine benzer özellikte yapay deprem kaydı kullanılarak zeminin frekans tepkisi belirlenmiş ve bu yolla rezonans özelliklerinin tanımlanması amaçlanmıştır. Elde edilen transfer fonksiyonları, sahada kaydedilen deprem kayıtları ve gürültü kayıtlarından hesaplanan HVSR eğrileri ile karşılaştırılmış; hakim frekans başta olmak üzere, spektral tepkilerin uyumu değerlendirilmiştir. Bulgular, yüzey dalgası yöntemlerinin birlikte kullanımı ile Vs profillerinin transfer fonksiyonu yaklaşımı ile değerlendirilmesinin, deprem kayıtları ve gürültü kayıtlarından elde edilen saha koşullarına özgü frekans karakteristiklerinin belirlenmesinde 1B zemin davranışının etkin olduğu sahalarda güvenilir bir yöntem sunduğunu ortaya koymaktadır.

Keywords

• Kayma Dalgası Hız Profili
• Lineer Zemin Tepki Analizi
• Transfer Fonksiyonu
• Yatay/Düşey Spektral Oran
• Hakim Frekans

Comparison of Transfer Functions Calculated from 1D Ground Response Analyses Based on Shear Wave Velocities Obtained by Surface Wave Methods with HVSR Curves

Abstract

In this study, the transfer functions derived from one-dimensional (1D) linear ground response analyses based on shear wave velocity (Vs) profiles obtained through surface wave analysis methods (MASW and ReMi) are compared in the frequency domain with horizontal-to-vertical spectral ratio (HVSR) curves computed from acceleration and ambient noise recordings acquired at the same locations. Within the scope of the study, synthetic earthquake records with characteristics similar to regional acceleration records were used as input motion in the ground response analyses to determine the frequency response of the soil and to identify resonance properties. The resulting transfer functions were compared with HVSR curves calculated from both seismic event and ambient noise recordings. The comparison focused primarily on dominant frequency and the agreement of spectral responses. The findings indicate that evaluating Vs profiles derived from combined surface wave methods using the transfer function approach offers a reliable method for identifying site-specific frequency characteristics, especially in locations where 1D soil behavior is dominant.

Keywords

• Shear Wave Velocity Profile
• Lineer Site Response Analysis
• Tranfer Function
• Horizontal/Vertical Spektral Raito
• Dominant Frequency

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