Comparison of One Dimensional Dynamic Analysis and Microtremor Measurement Results

Year 2019, Volume: 30 Issue: 5, 9459 - 9481, 01.09.2019

Ozan Subaşi , Murat Emre Haşal Bilal Özaslan Recep İyisan , Hiroaki Yamanaka Kosuke Chımoto

https://doi.org/10.18400/tekderg.399710

Cited By: 6

Abstract

The deformation level of the surface soil layer
due to strong ground motion has a considerable effect in soil-structure
interaction problems. The shear strain values of the near surface soil deposits
which are calculated by one dimensional (1D) seismic site response analyses can
also be estimated by incorporating the results obtained from
Horizontal-to-Vertical Spectral Ratio (HVSR) analysis of microtremor data and peak
horizontal acceleration value of design ground motion. In this study, the
seismic behaviour of soil layers at a site located in the vicinity of North
Anatolian Fault were estimated by both 1D  equivalent linear seismic site response
analyses under 14 different rock outcrop motion records and analyses of ground
ambient noise-microtremor measurement data. A correlation is proposed for
elastic and elasto-plastic deformation levels of surface soil layers in order
to estimate the value of shear strain due to strong ground motion

Keywords

1D Seismic Site Response Analysis, Microtremor, Shear Strain

Bir Boyutlu Dinamik Analiz ve Mikrotremor Ölçüm Sonuçlarının Karşılaştırılması

Abstract

Depremler sırasında zemin tabakalarında oluşan deformasyon
seviyeleri, yapı-zemin etkileşiminde önemli rol oynamaktadır. Kuvvetli yer hareketi kayıtları kullanılarak
yapılan bir boyutlu (1D) dinamik analizlerle yüzeye yakın zemin tabakaları için
hesaplanan kayma şekil değiştirmeleri, küçük genlikli titreşimler-mikrotremor verisi
analiz sonuçlarının tasarım yer hareketine ait en büyük yatay ivme değeriyle birlikte
değerlendirilmesiyle de tahmin edilebilmektedir. Bu
çalışmada, Kuzey Anadolu Fay Hattına yakın bir bölgede zemin tabakalarının deprem
hareketi karşısındaki davranışı hem 14 farklı anakaya ivme kaydı kullanılarak yapılan 1D eşdeğer lineer dinamik analizlerle hem de mikrotremor ölçümlerinin
analizi yardımıyla elde edilmiştir. Verilerin değerlendirilmesi sonucunda;
kuvvetli yer hareketi sırasında yüzeye yakın zemin tabakalarında oluşacak kayma
birim şekil değiştirmesinin belirlenebilmesi amacıyla, elastik ve elasto-plastik
deformasyon seviyelerini kapsayan bir bağıntı önerilmiştir.

Keywords

1D Dinamik Analiz, Mikrotremor, kayma birim şekil değiştirmesi

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