Tuna, Şahin Çağlar
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Name Variants
Şahin Çaǧlar Tuna
Job Title
Dr.Öğr.Üyesi
Email Address
Main Affiliation
01.01.09.05. İnşaat Mühendisliği Bölümü
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
1
Research Products
2ZERO HUNGER
0
Research Products
3GOOD HEALTH AND WELL-BEING
0
Research Products
4QUALITY EDUCATION
1
Research Products
5GENDER EQUALITY
3
Research Products
6CLEAN WATER AND SANITATION
0
Research Products
7AFFORDABLE AND CLEAN ENERGY
0
Research Products
8DECENT WORK AND ECONOMIC GROWTH
5
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
0
Research Products
10REDUCED INEQUALITIES
3
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
2
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
0
Research Products
13CLIMATE ACTION
0
Research Products
14LIFE BELOW WATER
0
Research Products
15LIFE ON LAND
0
Research Products
16PEACE, JUSTICE AND STRONG INSTITUTIONS
1
Research Products
17PARTNERSHIPS FOR THE GOALS
2
Research Products
Documents
9
Citations
148
h-index
5
Documents
11
Citations
101
Scholarly Output
15
Articles
14
Views / Downloads
0/2
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
107
Scopus Citation Count
150
Patents
0
Projects
0
WoS Citations per Publication
7.13
Scopus Citations per Publication
10.00
Open Access Source
2
Supervised Theses
0
| Journal | Count |
|---|---|
| Bulletin of Earthquake Engineering | 3 |
| Ikonomicheski Izsledvania | 2 |
| Applied Research in Quality of Life | 1 |
| Buildings | 1 |
| Çukurova Üniversitesi Mühendislik Fakültesi Dergisi | 1 |
Current Page: 1 / 3
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Competency Cloud
15 results
Scholarly Output Search Results
Now showing 1 - 10 of 15
Conference Object Citation - WoS: 11Citation - Scopus: 15How the education affects female labor force? Empirical evidence from Turkey(Elsevier Science bv, 2010) Meltem Ince Yenilmez; Ince, MeltemThis article investigates the major issues of females in Turkey and the characteristics required of school improvement with many educational reforms they have faced from the perspectives of women. It is a brief overview of the field of human capital theory. This is followed by explaining datas used to construct Time-series with variables provided. Results indicated that increasing the education of women can be considered to related to decreasing fertility and mortality rates while has a positive effect on female employment and their literacy. Additionally educated women were said to increase their problem solving life skills flexibility and openmindness. © 2010 Elsevier Ltd. All rights reserved. © 2010 Elsevier B.V. All rights reserved.Article Citation - Scopus: 2The Concepts of Empowering Women in Turkey(Allied Business Academies, 2019) Yenilmez, Meltem InceArticle Probabilistic evaluation of liquefaction analysis in performance based design framework(Springer Science and Business Media B.V., 2025) Şahin Çaǧlar Tuna; Selim Altun; Altun, Selim; Tuna, Sahin CaglarSoil liquefaction during earthquakes poses a persistent challenge in geotechnical engineering particularly in translating advanced numerical simulations into reliable performance-based damage predictions. This study presents a novel framework that incorporates the maximum excess pore pressure ratio (PPR_max)—a simulation–derived yet underutilized Engineering Demand Parameter (EDP)—to directly predict liquefaction–induced damage under site–specific seismic loading conditions. Dynamic effective–stress finite element simulations were performed for soft alluvial soils in the seismically active İzmir–Karşıyaka region. Using logistic regression and receiver operating characteristic (ROC) analysis PPR_max thresholds were statistically calibrated against observed damage levels to define transition points between minor and moderate damage. This calibration enabled the derivation of fragility curves linking peak ground acceleration (PGA) to probabilistic damage states within a regional hazard–consistent framework. The study further demonstrates the critical role of liquefiable layer thickness in controlling seismic pore pressure response. Even under identical ground motion intensities variations in stratigraphy produced significantly different damage outcomes—highlighting a major gap in current seismic codes which often neglect subsurface variability. The proposed framework enhances the predictive capacity of liquefaction risk assessments by bridging physics–based numerical modeling and empirical damage observations. It provides a scalable foundation for integrating simulation–compatible EDPs into performance–based seismic design and risk mitigation strategies. © 2025 Elsevier B.V. All rights reserved.Article Citation - Scopus: 12An inquiry into improving women participation in entrepreneurship in Turkey(Allied Business Academies support@alliedacademies.org, 2018) Meltem Ince Yenilmez; Yenilmez, Meltem InceThis research examines female small business owners who run and operate companies and start-ups in two different cities in Turkey, Istanbul and Izmir. The research takes a look at the challenges women face in founding and running their businesses and how to manage work-family conflicts that arise. By taking a look at the level of progress of Turkish female entrepreneurs the research draws a line between the differences and similarities between female entrepreneurs in Turkey and those in developed countries and seeks to find how their venture into entrepreneurship affects their cultural social and economic standing. This is primarily an exploratory research and therefore the findings are peculiar to female entrepreneurs in the two cities mentioned earlier. The research hopes to serve as an eye opener and a guide to further research. The research presents its findings and recommendations that could be carried out by government and implemented as government policies to encourage other women to go into entrepreneurship. One way government can go about this is to increase the number of spaces for women in social economic cultural legal and political sectors as these will improve the chances of women becoming employers of labour. © 2018 Elsevier B.V. All rights reserved.Article Global financial crisis and turkey: Effects and suggestions(2010) Meltem Ince Yenilmez; Ince, MeltemA global financial crisis hit the world in late 2008. It has become clear that this financial crisis will have a deep impact on countries trade volumes and investment plans. When the crisis was started in financial markets it affected developed countries as much as developing ones. From the beginning of September 2008 it started to be deepening in USA while it was spread out to the world. Turkey is one of the countries affected from this global economic crisis. Turkey had became dependant on capital accumulation movements after 1990s. Growth with capital accumulation movements constituted a relationship between capital movements and balance of payment. Growth related to short run capital movements provided money from money instead of production. So it affects investments negatively and this makes a negative effect on growth in long run period. The clearest effect of global crisis to Turkey is unemployment and inflation. Although it is very difficult for Turkey to put these two in order in last years it has been started to decrease with policies but with this global crisis they are increased again. © 2011 Elsevier B.V. All rights reserved.Article Citation - WoS: 2Citation - Scopus: 2Probabilistic assessment of soil liquefaction-induced failures during the 2023 Kahramanmaraş earthquakes in Türkiye: A case study from Iskenderun city(Elsevier Ltd, 2025) Şahin Çaǧlar Tuna; Tuna, Şahin ÇağlarThe February 6 2023 Kahramanmaraş earthquakes and their aftershocks caused devastating destruction across Türkiye and Syria. Widespread liquefaction-induced damage—particularly in regions such as Iskenderun Adıyaman-Gölbaşı Hatay-Dörtyol and Reyhanlı—was reported along with general structural damage throughout the affected areas. This study addresses the critical issue of soil liquefaction within a probabilistic earthquake–soil–structure interaction framework and provides a comprehensive assessment of its impacts. An empirical methodology is proposed for estimating liquefaction-induced settlements near buildings by integrating post-earthquake reconnaissance observations with analytical results within a Performance-Based Design (PBD) framework. The analysis focuses on three regions within the Iskenderun district which were selected based on observed evidence of liquefaction and underlying geotechnical characteristics. Geotechnical investigation reports and recorded ground motion data were employed to evaluate the influence of local soil conditions. Site effects were evaluated using one-dimensional site response analyses which allowed for the simulation of ground motion amplification. The resulting surface acceleration time histories served as the basis for the damage assessment. To quantify liquefaction susceptibility a data-driven classification of the Liquefaction Potential Index (LPI) was conducted using K-Means clustering facilitating the derivation of optimized thresholds for damage severity. Based on this classification empirical fragility functions were developed to relate the Liquefaction Potential Index (LPI) to the Damage Severity Index (DSI) enabling the estimation of exceedance probabilities for different damage states. The findings highlight the importance of probabilistic fragility modeling in enhancing seismic hazard mitigation strategies and informing risk-based engineering decisions. © 2025 Elsevier B.V. All rights reserved.Review Citation - WoS: 79Citation - Scopus: 102Economic and Social Consequences of Population Aging the Dilemmas and Opportunities in the Twenty-First Century(Springer Netherlands, 2015) Meltem Ince Yenilmez; Ince Yenilmez, Meltem; Yenilmez, Meltem IncePopulation aging is one of the most important demographic features that has come into prominence in the twenty-first century. In general longevity has increased while fertility has declined resulting in an increase in the proportion of the older people. Aging of the population affects all aspects of the society including health social security education socio-cultural activities family life and the labor market. Regarding the latter a decline in the young population of working age lowers the labour force participation rate leading to a rise in the proportion of retired people. While governments in both developing and developed countries primarily focus on the negative effects of this for socio- demographic development they have often also considered how such labour shortages can be mitigated by increasing the retirement age. Regarding care of the elderly if fertility continues decreasing then this will inevitably lead to a lack of care workers both paid and unpaid especially for elderly people. The social and economic provision of care still creates gender dilemmas for societies by narrowing the range of employment opportunities for women. As caring responsibilities are in general better fulfilled by women high demand for paid care workers will increase women’s participation in the labor market in place of their role as unpaid care workers in the household. This paper analyzes possible changes in several variables including labour force participation the pension system retirement age and labour supply. It places special emphasis on a variety of demographic and policy forces that are vitally important for evaluating the impact of population aging on economic growth. It also considers the implications of these developments for closing the gender gap in pension provision. It ends by offering some policy options aimed at forming the active policies that are essential for coping with the world’s rapidly increasing number of older people. © 2015 Elsevier B.V. All rights reserved.Article Citation - WoS: 10Citation - Scopus: 8Salary differences under the salary cap in Major League Soccer(SAGE PUBLICATIONS LTD, 2017) Onur B. Celik; Meltem Ince-Yenilmez; Ince-Yenilmez, Meltem; Celik, Onur B.Professional soccer is the world's most popular sport, a number of National Leagues are under the control of National Associations. The economic theory behind soccer is the continuing competition to earn much more than other sports do in the sports market. Since the supply of talent is limited teams' demand for certain professionals is so strong that it leads to salary differences between players. Therefore in this study attention is given to the determinants of the differences in workers' salaries in the Major League Soccer labor market using Generalized Least Squares (GLS) estimation on panel data from 2007 to 2016. Birth place is the most influential determinant of a player's salary along with a player's position a player's age whether the player has a national team duty and the number of games in which the player started in the first eleven. Conversely moving from one Major League Soccer team to another and the number of games played as a substitute have a negative effect on players' salaries.Article Direct Shear Box Assessment of Sand–Rubber Mixtures: Strength, Ductility, and a Performance Index(2025) Tuna, Sahin CaglarThe reuse of waste materials in geotechnical engineering promotes sustainability while enhancing soil performance. This study investigates the effect of shredded waste rubber on sand through consolidated drained direct shear tests at two relative densities (Dr ≈ 30% and 70%) with 0–10% rubber content. Rubber inclusion reduced brittleness and improved ductility, with mixtures containing 2.5–5% achieving the most favorable strength–deformation balance. In loose sand, cohesion and friction angle increased up to 5%, while in dense sand cohesion rose slightly but friction angle declined at higher contents. A new Performance Index (PI) is proposed in this study, integrating energy absorption, ductility, and residual-to-peak strength into a unified framework. The PI confirmed the 2.5–5% range as optimum, providing a practical tool for mixture evaluation. These findings indicate that low rubber contents are suitable for seismic embankments, retaining walls, and transportation subgrades, while higher contents may be more effective in lightweight and energy-dissipative applications.Article Numerical and Experimental Evaluation of Axial Load Transfer in Deep Foundations Within Stratified Cohesive Soils(Multidisciplinary Digital Publishing Institute (MDPI), 2025) Şahin Çaǧlar TunaThis study presents a numerical and experimental evaluation of axial load transfer mechanisms in deep foundations constructed in stratified cohesive soils in İzmir Türkiye. A full-scale bi-directional static load test equipped with strain gauges was conducted on a barrette pile to investigate depth-dependent mobilization of shaft resistance. A finite element model was developed and calibrated using field-observed load–settlement and strain data to replicate the pile–soil interaction and deformation behavior. The analysis revealed a shaft-dominated load transfer behavior with progressive mobilization concentrated in intermediate-depth cohesive layers. Sensitivity analysis identified the undrained stiffness (Eu) as the most influential parameter governing pile settlement. A strong polynomial correlation was established between calibrated Eu values and SPT N60 offering a practical tool for preliminary design. Additionally strain energy distribution was evaluated as a supplementary metric enhancing the interpretation of mobilization zones beyond conventional stress-based methods. The integrated approach provides valuable insights for performance-based foundation design in layered cohesive ground supporting the development of site-calibrated numerical models informed by full-scale testing data. © 2025 Elsevier B.V. All rights reserved.
