Examination of Earthquake Intensity Increments on Side-Zones of Valleys within Alluvial Basins by an Analytical Approach
Examination of Earthquake Intensity Increments on Side-Zones of Valleys within Alluvial Basins by an Analytical Approach
The effect of topography on the seismic wave-motion has been of interest to many studies. In this study, the earthquake-intensity increments (amplification) on side-zones of valleys within alluvial basins, were investigated using finite element method. A set of finite element models for valleys, one with a triangular cross-section, and the rest with trapezoidal cross-sections, taking into account five different side slopes (17º, 22º, 27º, 37º, 45º), were adapted. The acceleration time-histories obtained through the use of the commercial finite element code (QUAD4M) at valley-sides, valley-edges, and at the intermediate points were transformed to Fourier Amplitude Spectra. The amplitude-frequency variations obtained at the three selected reference points of the valley as well as at the bedrock, were investigated in each of the four selected phases of the earthquake duration. As a result of the performed dynamic analysis, the effect of the valley-slope variation at the three reference points on the valley was examined at four distinct phases of the earthquake duration.
Keywords:
Effects of topography, slope of valley seismic reflection,
___
- [1] Özaydın, K., “Yer hareketleri üzerinde yerel zemin koşullarının etkisi ve zemin büyütmesi”, TDV, TDV/TR 96-003, İstanbul, 2-6 (1996).
- [2] Haşal, M., İyisan, R., “Yerel zemin koşullarının zemin büyütmesine etkisi: bir ve iki boyutlu analiz, ZM 10 Kongresi, İstanbul, 343-352 (2004).
- [3] Şafak, E., “Local site effects and dynamic soil behaviour”, Soil Dynamics and Earthquake Engineering, 21: 453-458 (2001).
- [4] Rassem, M., Ghobarah, A., Heidebrecht, A.C., “Engineering perspective for the seismic site response of alluvial valleys”, Earthquake Engineering and Structural Dynamics, 26: 477-493 (1997).
- [5] Bakır, B.S., Erşahin, B., “Alüvyon Vadi ve Havzalarında Gömülü Topografyanın Kuvvetli Yer Hareketi Üzerindeki Etkileri”, 4. Ulusal Deprem Mühendisliği Konferansı, ODTÜ Kongre ve Kültür Merkezi, Ankara, 79-87 (1997).
- [6] Pampal, S., Soygür, Ü., Mutlu, A.H., “The impact of topography on Çay Small Scale Industrial Complex earthquake damages inflicted by 03.02.2002 Eber (Sultandağı) and Çay Earthquakes”, ZM 2003, Lefkoşa, K.K.T.C, 207-213 (2003).
- [7] Cılız, S., “The Effect of Basin Edge Slope on the Dynamic Response of Soil Deposits”, Doktora Tezi, ODTÜ Fen Bilimleri Enstitüsü, Ankara, 2007.
- Yayın Aralığı: Yılda 2 Sayı
- Başlangıç: 2015
- Yayıncı: Emrah DOĞAN