Ecemiş, Nurhan
Loading...
Profile URL
Name Variants
Ecemiş, N.
Ecemis, Nurhan
Ecemiş, N
Ecemis, Nurhan
Ecemiş, N
Job Title
Email Address
nurhanecemis@iyte.edu.tr
Main Affiliation
03.03. Department of Civil Engineering
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
0
Research Products
3GOOD HEALTH AND WELL-BEING
0
Research Products
4QUALITY EDUCATION
1
Research Products
5GENDER EQUALITY
0
Research Products
6CLEAN WATER AND SANITATION
0
Research Products
7AFFORDABLE AND CLEAN ENERGY
0
Research Products
8DECENT WORK AND ECONOMIC GROWTH
0
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
4
Research Products
10REDUCED INEQUALITIES
0
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
3
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
1
Research Products
13CLIMATE ACTION
0
Research Products
14LIFE BELOW WATER
0
Research Products
15LIFE ON LAND
0
Research Products
16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
17PARTNERSHIPS FOR THE GOALS
0
Research Products
Documents
25
Citations
440
h-index
12
Documents
23
Citations
370
Scholarly Output
27
Articles
20
Views / Downloads
27976/11595
Supervised MSc Theses
5
Supervised PhD Theses
0
WoS Citation Count
365
Scopus Citation Count
416
Patents
0
Projects
4
WoS Citations per Publication
13.52
Scopus Citations per Publication
15.41
Open Access Source
16
Supervised Theses
5
| Journal | Count |
|---|---|
| Bulletin of Earthquake Engineering | 6 |
| Geotechnical Testing Journal | 2 |
| Soil Dynamics and Earthquake Engineering | 2 |
| Computer Methods and Recent Advances in Geomechanics | 1 |
| Earthquake Engineering & Structural Dynamics | 1 |
Current Page: 1 / 3
Scopus Quartile Distribution
Competency Cloud
27 results
Scholarly Output Search Results
Now showing 1 - 10 of 27
Article Citation - WoS: 13Citation - Scopus: 13Effect of Soil-Type and Fines Content on Liquefaction Resistance—shear-Wave Velocity Correlation(Taylor & Francis, 2020) Ecemiş, NurhanDirect measurement of shear-wave velocity, Vs, in the field to evaluate the liquefaction resistance of soils is an alternative or complement approach to penetration-based methods. However, the existing liquefaction assessment methods established on the Vs have uncertainties about how the fines content and soil-type change the relationship between Vs and liquefaction resistance. The first part of this paper discusses the existence of fines on the correlation between cone penetration resistance and Vs. The second part focuses on the liquefaction resistance that is construed over again using the simplified cone penetration test (CPT)-based liquefaction screening procedure in terms of Vs for three distinct ranges of non-/low plastic fines content <35% fines. The outcomes of the investigation indicate that for each fines content, the correlation between CRR and Vs1 is not unique; there is a significant scattering of the curves for different soil types. Finally, using the results of this investigation as well as the simplified CPT-based liquefaction screening method, a soil-type specific CRR–Vs1 relationship developed for the unbounded, very young (Holocene-age) soils. © 2018 Taylor & Francis Group, LLCArticle Citation - WoS: 3Citation - Scopus: 3Assessment of Seismic Liquefaction and Structural Instability in Adiyaman-Golbasi After the February 6, 2023, Earthquakes in Türkiye(Elsevier Sci Ltd, 2025) Ecemis, Nurhan; Dalgıç, Korhan Deniz; Donmez, Cemalettin; Karaman, Mustafa; Karaman, Mustafa; Dönmez, Cemalettin; Valizadeh, Hadi; Ecemiş, Nurhan; Dalgic, Korhan DenizTwo earthquakes, Mw = 7.8 Kahramanmaras,-Pazarcik, and Mw = 7.6 Elbistan, occurred on February 6, 2023, approximately 9 h apart. These earthquakes caused devastating effects in a total of 11 nearby cities on the east side of T & uuml;rkiye (Adana, Adiyaman, Diyarbakir, Elazig, Gaziantep, Hatay, Kahramanmaras,, Kilis, Malatya, Osmaniye, and S,anliurfa) and the north side of Syria. These earthquakes provided an outstanding prospect to observe the effects of liquefaction in silty sand and liquefaction-like behavior in clays (cyclic softening) on the stability of structures. This paper specifically presents the post-earthquake reconnaissance at three sites and evaluations of four buildings within these sites in Adiyaman Province, Golbas, i District. First, important role of post-earthquake piezocone penetration test (CPTu) in characterizing the subsurface conditions was presented. Then, the effect of soil liquefaction and cyclic softening on the performance of four buildings during the earthquakes was evaluated. These structures represent the typical new reinforced concrete buildings in T & uuml;rkiye with 3 to 6-story, situated on shallow (raft) foundations, and demonstrated diverse structural performances from full resilience to moderate and extensive damage during the aforementioned earthquakes. Based on the interim findings from these sites, the potential factors that caused moderate to severe damage to buildings were inspected, and preliminary-immediate insights were presented on the relationship between structural design, soil properties, and the performance of buildings with shallow foundations.Article Citation - WoS: 13Citation - Scopus: 12Geotechnical Reconnaissance Findings of the October 30 2020, Mw7.0 Samos Island (aegean Sea) Earthquake(Springer, 2022) Ziotopoulou, Katerinaa; Pelekis, Panagiotis; Klimis, Nikolaos; Çetin, Kemal Önder; Altun, Selim; Sezer, Alper; Ecemiş, NurhanOn October 30, 2020 14:51 (UTC), a moment magnitude (Mw) of 7.0 (USGS, EMSC) earthquake occurred in the Aegean Sea north of the island of Samos, Greece. Turkish and Hellenic geotechnical reconnaissance teams were deployed immediately after the event and their findings are documented herein. The predominantly observed failure mechanism was that of earthquake-induced liquefaction and its associated impacts. Such failures are presented and discussed together with a preliminary assessment of the performance of building foundations, slopes and deep excavations, retaining structures and quay walls. On the Anatolian side (Turkey), and with the exception of the Izmir-Bayrakli region where significant site effects were observed, no major geotechnical effects were observed in the form of foundation failures, surface manifestation of liquefaction and lateral soil spreading, rock falls/landslides, failures of deep excavations, retaining structures, quay walls, and subway tunnels. In Samos (Greece), evidence of liquefaction, lateral spreading and damage to quay walls in ports were observed on the northern side of the island. Despite the proximity to the fault (about 10 km), the amplitude and the duration of shaking, the associated liquefaction phenomena were not pervasive. It is further unclear whether the damage to quay walls was due to liquefaction of the underlying soil, or merely due to the inertia of those structures, in conjunction with the presence of soft (yet not necessarily liquefied) foundation soil. A number of rockfalls/landslides were observed but the relevant phenomena were not particularly severe. Similar to the Anatolian side, no failures of engineered retaining structures and major infrastructure such as dams, bridges, viaducts, tunnels were observed in the island of Samos which can be mostly attributed to the lack of such infrastructure.Article Citation - WoS: 34Citation - Scopus: 39Influence of Consolidation Properties on the Cyclic Re-Liquefaction Potential of Sands(Springer Verlag, 2015) Ecemiş, Nurhan; Demirci, Hasan Emre; Karaman, MustafaThe relative density can be used as the main indicator to assess the liquefaction resistance of clean sands. As relative density of the sand deposit increases significantly following the initial liquefaction, one should expect that the soil can improve its liquefaction resistance. However, earthquake records indicate that densified sand can be liquefied again (re-liquefied) at smaller cycles by the similar seismic loadings. This work aims to clarify the counterintuitive finding that, after the first liquefaction, the resulting significant increase in relative density (induced by settlements and variation of the water level) do not necessarily imply an increase in the number of loading cycles for re-liquefaction. In this paper, we present a series of experimental results concerning the cyclic liquefaction and the following re-liquefaction of clean sand deposits. The experimental setup is performed by a shaking table, transmitting one-degree of freedom transversal motion to the soil within the 1.5 m high laminar shear box. At four different seismic demands, the input excitation was imposed three times to examine the influence of the initial distributions of the relative density and the consolidation characteristics on the liquefaction potential of the sand. The re-liquefaction cycles of the sand, which previously experienced liquefaction under the same seismic loadings, show that post-liquefaction reconsolidation of the sand deposits affects the re-liquefaction resistance.Article Citation - WoS: 34Citation - Scopus: 38The Use of Neural Networks for Cpt-Based Liquefaction Screening(Springer Verlag, 2014) Erzin, Yusuf; Ecemiş, NurhanThis study deals with development of two different artificial neural network (ANN) models: one for predicting cone penetration resistance and the other for predicting liquefaction resistance. For this purpose, cone penetration numerical simulations and cyclic triaxial tests conducted on Ottawa sand–silt mixes at different fines content were used. Results obtained from ANN models were compared with simulation and experimental results and found close to them. In addition, the performance indices such as coefficient of determination, root mean square error, mean absolute error, and variance were used to check the prediction capacity of the ANN models developed. Both ANN models have shown a high prediction performance based on the performance indices. It has been demonstrated that the ANN models developed in this study can be employed for predicting cone penetration and liquefaction resistances of sand–silt mixes quite efficiently.Article Citation - WoS: 48Citation - Scopus: 51Laminar Box System for 1-G Physical Modeling of Liquefaction and Lateral Spreading(American Society for Testing and Materials, 2009) Thevanayagam, S.; Kanagalingam, T.; Reinhorn, A.; Tharmendhira, R.; Dobry, R.; Abdoun, T.; Elgamal, A.; Zeghal, M.; Ecemiş, Nurhan; El Shamy, U.Details of a large scale modular 1-g laminar box system capable of simulating seismic induced liquefaction and lateral spreading response of level or gently sloping loose deposits of up to 6 m depth are presented. The internal dimensions of the largest module are 5 m in length and 2.75 m in width. The system includes a two dimensional laminar box made of 24 laminates stacked on top of each other supported by ball bearings, a base shaker resting on a strong floor, two computer controlled high speed actuators mounted on a strong wall, a dense array advanced instrumentation, and a novel system for laboratory hydraulic placement of loose sand deposit, which mimics underwater deposition in a narrow density range. The stacks of laminates slide on each other using a low-friction high-load capacity ball bearing system placed between each laminate. It could also be reconfigured into two smaller modules that are 2.5 m wide, 2.75 m long, and up to 3 m high. The maximum shear strain achievable in this system is 15 %. A limited set of instrumentation data is presented to highlight the capabilities of this equipment system. The reliability of the dense array sensor data is illustrated using cross comparison of accelerations and displacements measured by different types of sensors. Copyright © 2009 by ASTM International.Master Thesis Prevention of Angular Buried Pipe Failures Under Shear Static Loads Using Granular Waste Tires(01. Izmir Institute of Technology, 2025) Albayrak, Burak; Ecemiş, NurhanDoğalgaz boruları, ulusal ekonomilerde önemli bir rol oynamaktadır, bu nedenle zarar görmemeleri ve işlevsiz hale gelmemeleri hayati önem taşımaktadır. Bu çalışma, gömülü boru hatlarının statik yükler karşısında granular atık lastikler kullanılarak korunmasını ele almaktadır. Gömülü borunun davranışı, etrafına 10-15 mm çapında granular atık lastikler serilerek ve boruya dışarıdan uygulanan kuvvetlere karşı gösterdiği tepki incelenerek araştırılmıştır. Ayrıca, karşılaştırma yapmak amacıyla bu deneyler boru etrafına siltli kum serilerek tekrarlanmıştır. Deneylerde ayrıca laminar kutunun kayma bölümü ile parçalı boru ek yeri arasındaki mesafe incelenmiş ve kademeli olarak artırılmıştır. Laminar kutuda yapılan deneylerde, dikey konumlandırılmış PE80 doğalgaz borusu için dolgu malzemesi olarak granüler atık lastik ve siltli kum kullanıldı; kuvvetler, gerinim ölçerler ve yük hücresi ile ölçüldü. Eğimli bir doğalgaz borusu, üzerindeki örtü yükü ve derinlikle artan yan basınca maruz kalırken, dikey bir boru yalnızca derinlikle artan yan basınca maruz kalır. Yatay bir boruya uygulanan dış kuvveti simüle etmek için, üçgen yayılı bir yük uygulanır ve bu, hem dikey hem de eğimli borular için tutarlı koşullar sağlar. Bu yüzden deneyde kullanılan boru dikey olarak yerleştirilmiş ve dikey haldeki boruya gelen kuvvetler borunun yatay hali için de sembolize edilerek bir denklik verilmiştir. Sonuç olarak, dolgu malzemesi olarak granüler atık lastik kullanımı, boru üzerine dışarıdan uygulanan yükleri siltli kuma kıyasla daha etkili bir şekilde sönümlemiştir. Boşluk oranı farklılığından dolayı dolgu malzemesi siltli kum olduğunda, boru üzerindeki yük çok kısa bir sürede ve hareketli bloğun minimum yer değiştirmesiyle etkisini göstermeye başlamıştır.Master Thesis Seismic Liquefaction: 1-G Model Testing System and Shake Table Tests(Izmir Institute of Technology, 2013) Kahraman, İrem; Ecemiş, NurhanSoil liquefaction is a crucial, interesting and complex seismic problem. Previous earthquake records and computational modelings have given general information about liquefaction, but many questions, such as; effects of silt content on liquefaction phenomena have not been clearly answered yet. In this study, liquefaction phenomena in sands and silty sands were simulated by a large scale 1-g laminar box system. Three shake table tests were performed, where each test consisted of four shakes to analyze the initial-liquefaction and re-liquefaction phenomena. Instrumentations were used during shake table tests to measure laminate, soil response and settlement of ground. The soil deposit was prepared with different fines content using hydraulic filling method. Piezocone penetration tests (CPTu) were conducted, before and after each shake to determine the relative density of the soil model. Following results were found; Silty sands were found to possess more liquefaction resistance than uniform fine sands. Soils with rounded shapes were more susceptible to liquefaction, than angular grained soils. Required time to trigger liquefaction increased with fines content and depth of the soil sedimentation. Liquefaction resistance of each tested sand decreased from 1st to the 2nd shaking, despite increase in relative density. Relative density values increased with each shake. Despite the increase in relative density, liquefaction resistance decreased. Relative density values have decreased, when fines content increased, but despite decreased in relative density, liquefaction resistance increased. Ground settlement values after the shaking was more than during the shaking. Ground settlement values have increased with fines content of the soil model.Article Citation - WoS: 10Citation - Scopus: 10Usage of Tyre Derived Aggregates as Backfill Around Buried Pipelines Crossing Strike-Slip Faults; Model Tests(Springer, 2022) Karaman, Mustafa; Demirci, Hasan Emre; Ecemiş, Nurhan; Bhattacharya, SubhamoyBuried pipelines crossing active faults are exposed to excessive soil forces under fault movements due to large relative movement between pipes and the soil surrounding them. As a result, extreme longitudinal strains develop within pipelines under large fault movements and this leads to pipeline failures. Several seismic mitigation techniques were proposed to improve the performance of buried pipelines crossing active faults. In this study, the potential of using Tyre Derived Aggregates (TDA) as a backfill material for mitigating the effects of strike-slip faulting are investigated through physical model tests. First, the details of the physical model test setup and model configuration are presented. Then a comparative study is carried out to study the effect of TDA content in the backfill and trench configurations on TDA mitigation. Model tests revealed that using a sloped trench with 100% TDA content in the backfill can decrease peak axial pipe strains up to 62% and peak bending strains up to 19%. It is observed that enlarging the trench and using an inclined trench improve the performance of the TDA mitigation technique.Article Citation - WoS: 9Citation - Scopus: 8Effect of Drainage Conditions on Cpt Resistance of Silty Sand: Physical Model and Field Tests(Springer, 2023) Ecemis, Nurhan; Arık, Mustafa Sezer; Taneri, HazalThe influence of drainage conditions on cone penetration test (CPT) resistance and the excess pore pressure during cone penetration in sand and silty sand are examined using field and physical model tests. Drainage can generally occur in saturated clean sand and silty sand under certain conditions. This work aims to understand and explain the effect of sand and silty sand drainage conditions on CPT resistance and pore pressure through the coefficient of consolidation (c h) and penetration rate (v). The physical model test results indicate the significant effect of excess pore pressures and their dissipation rates, depending on the coefficient of consolidation (silt content) and the penetration rate on cone resistance. For the same relative density, normalized CPT resistance decreases as there is a reduction in c h (or an increase in silt content) or an increase in penetration rate. The difference in CPT resistance in silty sand is attributed to drainage conditions. Finally, the results revealed in this study and the field test data reported in the literature were combined to develop an equation for the effect of drainage conditions on excess pore water pressure and CPT resistance. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
- «
- 1 (current)
- 2
- 3
- »