Evaluation of nonlinear site response of soft clay using centrifuge models
Başlık çevirisi mevcut değil.
- Tez No: 401670
- Danışmanlar: PROF. SCOOT J. BRANDENBERG
- Tez Türü: Doktora
- Konular: İnşaat Mühendisliği, Civil Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2014
- Dil: İngilizce
- Üniversite: Unıversıty Of Calıfornıa Los Angeles
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: İnşaat Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
Centrifuge models of soft clay deposits were shaken with suites of earthquake ground motions to study site response over a wide strain range. The models were constructed in an innovative hinged-plate container to effectively reproduce one dimensional ground response boundary conditions. Dense sensor arrays facilitate back-calculation of modulus reduction and damping values that show modest misfits from empirical models. Low amplitude base motions produced nearly elastic response in which ground motions were amplified through the soil column and the fundamental site period was approximately 1.0s. High intensity base motions produced shear strains higher than 10%, mobilizing shear failure in clay at stresses larger than the undrained monotonic shear strength. I attribute these high mobilized stresses to rate effects, which should be considered in strength parameter selection for nonlinear analysis. The nonlinearity in spectral amplification is parameterized in a form used for site terms in ground motion prediction equations to provide empirical constraint unavailable from ground motion databases. The nonlinear site response is covered by total stress simulations of centrifuge models involving soft clay, and effective stress simulations of centrifuge models including liquefiable sand layers. Primary conclusions from the total stress analysis are (1) unreasonable shear strength values may arise from extrapolating modulus reduction curves to large strains, and properly modeling the shear strength by adjusting the high-strain region of the modulus reduction curve is essential for accurate nonlinear site response modeling, and (2) the shear strength must be adjusted for strain rate effects to capture the measured ground motions. The primary conclusion from the effective stress simulations is that ground motions following liquefaction triggering are significantly under-predicted using a modeling procedure in which the backbone stress-strain behavior is degraded as pore pressures develop in accordance with a pore pressure generation function. These models fail to capture the dilatancy behavior of liquefied sand that manifests as a transient stiffening in undrained loading, and enables propagation of high amplitude high frequency acceleration pulses. Constitutive models capturing the dilatancy behavior are demonstrated to have the capability to replicate these acceleration pulses, but the resulting ground motions are highly sensitive to input parameters.
Benzer Tezler
- Equivalent linear and nonlinear site response analysis, study case for banda aceh, indonesia
Yerel zemin koşullarının sismik etkiler altında eşdeğer doğrusal ve doğrusal olmayan analizi, banda aceh, endonezya için bir çalısma
AMELIA FITRI
Yüksek Lisans
İngilizce
2022
İnşaat Mühendisliğiİstanbul Teknik Üniversitesiİnşaat Mühendisliği Ana Bilim Dalı
PROF. DR. MUSAFFA AYŞEN LAV
- Dinamik özellikleri belirlenen sıkıştırılmış killi kalın bir zemin tabakasının tek boyutlu sismik yer tepki analizleri
1D ground response analyses of compacted soil with dynamic properties measured in laboratory
CEREN AYDIN
Yüksek Lisans
Türkçe
2018
İnşaat Mühendisliğiİstanbul Teknik Üniversitesiİnşaat Mühendisliği Ana Bilim Dalı
PROF. DR. RECEP İYİSAN
- Zemin-yapı etkileşiminin betonarme binaların deprem performansına etkisi
Effects of soil-structure interaction on the seismic performance of reinforced concrete building
YAŞAR AVCI
Doktora
Türkçe
2018
Deprem Mühendisliğiİstanbul Teknik ÜniversitesiDeprem Mühendisliği Ana Bilim Dalı
DOÇ. DR. UFUK YAZGAN
- Çelik çerçeve yapıların doğrusal olmayan deprem davranışı
Nonlinear earthquake response of steel frame structures
GÜLHAN DURMUŞ
Yüksek Lisans
Türkçe
2003
İnşaat MühendisliğiSüleyman Demirel Üniversitesiİnşaat Mühendisliği Ana Bilim Dalı
YRD. DOÇ. DR. ZEKİ AY
- Zemin büyütmesinin TBDY tarafından parametrik olarak elde edilmesi
Parametric evaluation of site amplification according to TBDY
MELİS ERSOY
Yüksek Lisans
Türkçe
2025
İnşaat MühendisliğiEskişehir Osmangazi Üniversitesiİnşaat Mühendisliği Ana Bilim Dalı
DOÇ. DR. KAMİL BEKİR AFACAN