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Koleksiyondaki öğeler
- MakaleAçık Erişim2022Scopus SJRQ3Contributions on the southern distribution of Vespertilio murinus Linnaeus, 1758 (Chiroptera: Vespertilionidae) from Türkiye
Karataş, Ahmet; Bulut, Şafak; Sefali, Abdurrahman; Toprak, Ferhat; Şahin, Mehmet Kürşat; Özkurt, Şakir Önder
Vespertilio murinus Linnaeus, 1758, has a wide distribution from France to Japan, and from Iran in the south to Scandinavia and Russia in the north. The only records of the parti-coloured bat, Vespertilio murinus known from Turkey so far were based on subfossils, remains from owl pellets, and ultrasound recordings. We present the first records of live individuals from two Turkish provinces, Ardahan and Bayburt. Additionally, based on echolocation call records, its known distribution in the Anatolian Peninsula was proved to be wider. The global distribution of the species has been mapped by using ecological niche modelling. The results revealed that its distribution is highly influenced by precipitation dynamics. Although no cases of domestic cat predation on bats have previously been documented in Turkey, this paper also provides the first case study of V. murinus predated by a domestic cat in Ardahan, in November 2003.
AtıfScopus3WoS2OpenAlex2TR Dizin2
İncele - MakaleAçık Erişim2021Scopus SJRQ3Virulence Factors, Antibiotic Resistance, And Antimicrobial Activity Of Enterococcus Spp. Isolated From Different Sources In Algeria
Houicher, Abderrahmane; Alkay, Zuhal; Bourahla, Mahdi; Dertli, Enes
This study aimed to isolate and identify different Enterococcus spp. from diverse sources including dromedary raw milk, rhizospheric soil and natural saline water samples and to determine their antimicrobial activities and safety aspects. From these sources, distinct strains of E. faecium, E. durans, E. hirae, and E. gallinarum species were detected. No virulence factors were observed for six Enterococcus strains while none of the tested Enterococci harboured the genes encoding cytolysin and aggregation substance. All tested strains showed a high sensitivity to many antibiotics, particularly vancomycin, and exhibited a remarkable antagonist activity toward Salmonella typhimurium, Fusarium graminearum and Penicillium expansum. PCR testing of enterocins revealed the co-presence of entA and entB among all tested Enterococci. No hemolytic reaction was also detected in Enterococci isolates, except for six strains. Based on these findings, potential candidates for use as biocontrol agents or probiotic starters were selected for further studies.
AtıfScopus4WoS3OpenAlex5İncele - MakaleAçık Erişim2020Scopus SJRQ4Investigation of alterations in PIK3CA and OCT-4 gene expression in breast cancer
Dirican, Ebubekir; Kankaya, Burak; Büyükaşık, Süleyman; Alış, Halil; Velidedeoğlu, Mehmet; İlvan, Sennur; İlvan, Ahmet
Breast cancer (BCa) is one of the most prevalent cancer amongst women and PIK3CA mutations have a crucial role in carcinogenesis. On the other hand, Octamer-Binding Transcription Factor 4 (OCT-4) is common biomarkers of cancer stem cells, which provide to the pathological processes of numerous carcinomas. In this study, we evaluated the association of OCT-4 gene expression levels with the PIK3CA mutation in BCa patients. The mRNA expression level of the OCT-4 gene was detected by qPCR in 44 BCa patients and 30 BCa patients control have positive PIK3CA mutations. Exon 9 and exon 20 of PIK3CA mutations were identified by sequencing. OCT-4 gene expression and PIK3CA mutations were also clinically evaluated in BCa patients. The frequency of PIK3CA mutation in 44 new cases were 32%. PIK3CA mutations were significantly associated with HER2-positive (p = 0.0271) status, Ki-67 status (p = 0.0434) and patient age (p = 0.0149). OCT-4 mRNA expression was significantly higher in the BCa tissue in comparison to normal breast tissue (p = 0.0305). A significant correlation was found between expression of OCT-4 and node status (p = 0.0190). OCT-4 mRNA expression was higher in the PIK3CA mutation tissue than the wild type tissue. However, no association was found between the expression of OCT-4 and the PIK3CA mutation or wild type samples (p = 0.7908). Our results provided that OCT-4 gene and PIK3CA mutations may have a role in development of BCa. OCT-4 mRNA expression level and PIK3CA mutations have a potential important for BCa diagnosis or treatment.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2020Scopus SJRQ2The relationship between housing prices and inflation rate in Turkey: Evidence from panel Konya causality test
Korkmaz, Özge
Purpose: Human beings need shelter as the beginning of their existence. Same holds true for people who live in Turkey as it is a cultural and traditional reason to be the host and endeavor to buy a home even if one has to pay the debt for years. Another factor that is important for individuals and even for countries is the inflation rate. In this context, the purpose of this study is to investigate whether the 26 regions of Turkey are affected by the inflationary pressure, specifically in the housing price index (HPI). Design/methodology/approach: For this purpose, data from 2010:01 to 2019:01 and the consumer price index (CPI), as well as HPI have been used. The causal relationship between the variables is analyzed by Konya Causality (2006) test. Findings: The key results suggest that HPI causes inflationary pressures in some regions. Research limitations/implications: The study has some limitations in terms of data set and scope. These are as follows: although there are many variables affecting housing prices, this study aims to investigate the causal link between inflation and housing prices. In addition, only the CPI and HPI variables were provided on a monthly basis in the 2010-2019 period for 26 regions due to the aim of making regional propositions in the investigation of this relationship. For these reasons, different macroeconomic variables could not be studied. Originality/value: This study makes the following contribution to the literature. While the majority of existing literature investigates the relationship between housing prices and inflation from an empirical perspective for country, very few studies have been for the sub-regions and also these studies have focused on only some sub-regions. In other words, in the literature review, a study has observed that Turkey has to examine the relationship between the housing price and inflation variables for all sub-regions in particular. To overcome this deficiency in the literature, this study aims to investigate the relationship between housing price and inflation for 26 regions.
AtıfScopus24WoS18OpenAlex36İncele - MakaleYalnız künye2022Scopus SJRQ1Bioactive and technological properties of an α-D-glucan synthesized by Weissella cibaria PDER21
Yilmaz, Mustafa Tahsin; Ispirli, Humeyra; Taylan, Osman; Alamoudi, Mohammed; Dertli, Enes
A slimy-mucinous-type colony of EPS-producing Weissella cibaria PDER21 was isolated and identified. The monomer composition was glucose, showing that the EPS is a glucan type homopolysaccharide, The core structure of (1 → 6)-linked α-D-glucose units including (1 → 3)-linked α-D-glucose branches at a ratio of 93.4/6.6 was revealed by 1H and 13C NMR spectra and confirmed by FTIR analysis. The glucan showed a superior thermal stability with almost no degradation in structure up to 300 °C. XRD analysis revealed the amorphous structure while SEM analysis confirmed the layer-like morphology. The glucan had an antioxidant activity (89.5%), water-holding capacity (103.7%) and water solubility index (80.7%) values, suggesting that the glucan had a strong level of antioxidant properties; good water binding capacity and excellent solubility. The glucan PDER21 is a polysaccharide possessing a good combination of technical and functional attributes, suggesting a great deal of potential for use in the food industry.
AtıfScopus42WoS41OpenAlex40
İncele - MakaleYayıncıda açık erişim2022Scopus SJRQ4Investigation of CYP2E1 and Caspase-3 Gene Expressions in COVID-19 patients
Karabulut Uzuncakmak, S.; Dirican, E.; Naldan, M.E.; Kesmez Can, F.; Halıcı, Z.
Background: COVID-19 pandemic spread around the world like an infectious disease that presents waved effects on patients. Some patients needed ICU and respiratory support. Some patients only had flu-like symptoms. Cytokine storm and elevated ROS were serious problems for treatment. Apoptotic genes and CYP Family are part of these mechanisms. Aim: In this study, our aim was to examine the gene expression CYP2E1 and Caspase-3 in patients with COVID-19 infection. Method: 60 COVID-19(+) patients (ICU and non-ICU patients) and 30 healthy volunteers were enrolled to study. To measure the level of gene expression qPCR was used. The 2-ΔΔCt method was utilized to analyze gene expression. Results: The expression of CYP2E1 and Caspase-3 genes showed a significant discrepancy between patients and healthy individuals. Caspase-3 expression increased (p=0,0041) but CYP2E1 expression decreased (p=0,0214) in COVID-19 patients compared to healthy individuals. Both levels of gene expression were lower in patients with affected lungs than patients with unaffected lungs (p<0,05). Laboratory findings including d-Dimer, LDH, platelet count, lymphocyte count were related to both gene expressions (p<0,05). We found no correlation between CYP2E1 and Caspase-3 expressions. Conclusion: The expression of Caspase-3 demonstrated apoptotic situations of patients but was not related to the CYP2E1 expression level. CYP2E1 gene expression is an important actor to metabolize endogens and xenobiotics however, COVID-19 patients demonstrated decreased CYP2E1 expression. CYP2E1 and Caspase-3 gene expression levels may be used as a diagnostic tool for COVID-19 patients.
AtıfScopus8WoS5OpenAlex7İncele - Kitap BölümüYalnız künye2021Analyzing financial performance of paper products, printing and publishing companies traded at BIST via fuzzy TOPSIS methodology
Çelik, Pelin
- MakaleYalnız künye2020MODELING OF BOOST AND CUK CONVERTERS AND COMPARISON OF THEIR PERFORMANCE IN MPPT
Güngör, Okan; Yüksek, Halil İbrahim
The efficiency of photovoltaic (PV) panel systems depends on the structure of the photovoltaic cells and the transfer of energy from the PV panel to load. The focus of this study is energy transfer. The most important component in the energy transfer is maximum power point tracking (MPPT). The MPPT consists of two components: the algorithm for calculation the maximum power and the hardware for power generating. This study investigates how some the DC-DC converters (hardware) impact on the performance of the MPPT under six different environmental conditions by using two different duty cycle calculation methods. Contribution of this study to the literatüre is to analyze the performance of some the DC-DC converters in MPPT by completely eliminating the effect of MPPT algorithms. As a result of this study, while using the Boost converter in MPPT applications, the internal resistance of the PV panel must be equal or smaller than load resistance. However, the Cuk converter can reach to maximum power point in all conditions such as temperature, radiation and load.
AtıfScopus2İncele - MakaleAçık Erişim2022Scopus SJRQ2Inclusive Pedagogical Content Knowledge of Mathematics Teachers: Learning Disabilities vs. Hearing Impairments
Güven, Dilsad; Gürefe, Nejla; Arıkan, Ahmet
This study aims at investigating inclusive pedagogical content knowledge (IPCK) of mathematics teachers who teaches in inclusive classes including learning disabilities (LD) students or hearing impairments (HI) students in the context of angle concept. The study is a cross-case study which facilitates the comparison as one of the multiple case designs. The participants of the study are six Turkish mathematics teachers, three of them have experience of teaching to students with LD, and three of them students with HI. The data of the study is collected via semi-structured clinical interviews, and analysed using cross-case analysis. According to the findings of the study that examines the IPCK of teachers regarding the concept of angle, it can be said that teachers’ definitions of angle and their teaching strategies are insufficient. Additionally, it was found that HI teachers used much more multiple presentation such as speaking, writing, drawing shapes, and gestures than LD teachers.
AtıfScopus4WoS1OpenAlex3İncele - MakaleAçık Erişim2020Scopus SJRQ4Effects of race, gender, body condition score and pregnancy on serum apelin levels in ewe
Bayraktar, Bülent; Tekce, Emre; Aksakal, Vecihi; Takma, Çiğdem; Bayraktar, Fatma Gülten; Şengül, Bülent
Apelin is an important adipokine hormone that is released from adipose tissue, which is considered as the energy store of the body, which plays a role in many physiological processes in the body, as well as cardiovascular, immune functions and energy, nutrients and fluid metabolism. In this study, it was aimed to determine the effect of lactation, pregnancy and gender on apelin hormone levels in blood serums belonging to different races of ewe. In the present study, the hormone levels of the pregnant, non-pregnant ewe and rams of the Akkaraman Kangal and Morkaraman races were thin, with different body condition scores (<2, 3 to 3.5 and ≥4). Apelin hormone level was determined by ELISA technique in blood serum samples of ewe's Jugular vein. It was determined that there was a difference in body scores between races and the interaction between race and body score was important (P<0.05). Apelin level in ewe in lactation and pregnant ewe did not change according to body condition scores (P>0.05). In terms of apelin, gender and body condition score, race and gender, and body condition score interactions were found to be significant.
AtıfScopus6WoS6OpenAlex4TR Dizin2İncele - MakaleAçık Erişim2021Scopus SJRQ1District heating and electricity production based on biogas produced from municipal WWTPs in Turkey: A comprehensive case study
Abusoglu, Aysegul; Tozlu, Alperen; Anvari-Moghaddam, Amjad
In this paper, district heating (DH) potentials of the wastewater treatment plants (WWTPs) based on their biogas, electricity, and heat productions are considered. Two district heating scenarios are developed: (i) DH Scenario I which is based on both excess biogas storage of the WWTP and exhaust gas of the cogeneration with the actual power output, (ii) DH Scenario II which is based on the exhaust gas of the cogeneration with the increased power output using all the biogas produced. In DH Scenario I, it is found that 458 dwellings can be heated via the DH system proposed considering only the waste heat of the cogeneration. In addition, the natural gas consumption of 1112 dwellings with the same annual heating load can also be met using the purified biogas. In DH Scenario II, the electricity production could be increased to 1643 kWh by burning all the biogas produced in the cogeneration plant. In this scenario, the annual heating load of 755 dwellings in Gaziantep province can be covered using the waste heat in the DH system. The payback period for the DH Scenario I is calculated as 2.5 years, while for the DH Scenario II, it is obtained as 2 years.
AtıfScopus27WoS28İncele - MakaleAçık Erişim2022Scopus SJRQ1Comparison of theoretical frameworks of doctoral theses on the field of instructional technology: The Turkey-US case
Şimşek, Eda Saka; Atila, Gülşah; Aydın, Abdulkerim; Reisoğlu, İlknur; Göktaş, Yüksel
Although there are suggestions for writing the theoretical framework in the literature, studies on how all sections of research should be structured based on the theoretical framework are limited. The current research compared the structuring of doctoral theses' theoretical frameworks in the field of instructional technology produced in Turkey and the US. Two hundred doctoral theses were subjected to content analysis based on the list of criteria developed by the researchers. The data collection tool includes the criteria of formality, language, definition and association, purpose and significance, methodological procedures, and presentation and interpretation of results. Independent factorial ANOVA were used to determine whether country and method affected the data obtained from the analyzed theses. The analysis of the data showed that the US-based theses were structured in accordance with the established criteria in all aspects except for purpose and importance. Method did not affect consistency with the criteria. The results of the study are anticipated to guide graduate students, thesis advisors, and researchers preparing theses and articles.
AtıfScopus3WoS2OpenAlex4İncele - MakaleAçık Erişim2021Scopus SJRQ3A novel approach to finding optimum operating conditions of design factors for the grinding experiment
Uçurum, Metin; Özdemir, Akın; Teke, Çağatay; Tekin, İlker
The efficiency of grinding experiments is an important issue for many industries. In this paper, a central composite design-based methodology was proposed to investigate the four design factors that affect the particle sizes. The four design factors were specified as mill speed (% of Nc), ball filling ratio (fc), powder filling ratio (jb) and grinding time (min). Another important issue was how to obtain an optimum operating condition for four design factors. For this particular purpose, a novel dual response optimization model was proposed using the particle sizes (d 10, d 50, and d 90) and the span value concept. This proposed approach was compared to the desirability function-based optimization concept. The verification study of the experiment was also carried out. The results of the grinding experiment runs showed that the optimum operating conditions were mill speed 73.495% of Nc, ball filling ratio 0.354, powder filling ratio 0.157, and grinding time 70 min. In addition, d 10, d 50, and d 90 were found 3.31 µm, 12µm, and 45.6 µm, respectively. The span value was also found at 3.52.
AtıfScopus3WoS3OpenAlex4İncele - MakaleAçık Erişim2021Scopus SJRQ3A novel weighted mean-squared error optimization model to obtain optimal conditions of adsorption factors for a lead removal process
Özdemir, Akın; Teke, Çağatay; Serencam, Hüseyin; Uçurum, Metin; Gündoğdu, Ali
Lead (Pb) removal process from wastewater is an important issue to prevent health problems for people. For this particular purpose, a low-cost adsorbent may be beneficial for improving the adsorption capacity for the Pb removal process. The aims of this paper are four-fold. First of all, a D-optimal experimental design was selected to reduce experimental runs and its cost. Second, the effect of four adsorption design factors, stirring speed (rpm), adsorbent dosage (g), pH level, and initial metal concentration (ppm), was examined. Also, the yellow natural stone, which is from Bayburt, Turkey, was used as a cheap adsorbent for the Pb removal process from the solu-tion. Third, a novel weighted mean-squared error optimization model was developed to obtain optimal adsorption levels for adsorption factors. Besides, a verification study was conducted to verify the results of the adsorption experiment. Finally, the lead (Pb(II)) removal capacity of the yellow Bayburt stone was obtained to be 46.031 mg/g, and the results of the experiment from the proposed methodology showed a good performance for the removal study.
- Derleme MakaleAçık Erişim2021Scopus SJRQ1Alkali-activated and geopolymer materials developed using innovative manufacturing techniques: A critical review
Gökçe, H.S.; Tuyan, M.; Nehdi, M.L.
The manufacturing of geopolymers and alkali-activated materials for precast and cast in-situ construction applications could be achieved using suitable production techniques, such as one-part production, pre-setting pressure and hot pressing, two-stage concreting, and 3-dimensional printing. Adequate selection and tailoring of the manufacturing methodology are imperative for overcoming characteristic application problems of these materials and achieving eco-efficiency and superior engineering properties. With distinctive benefits including rapid solidification, lower cost, saving natural resources, less energy consumption, and reduced carbon footprint, alkali-activated and geopolymer composites have emerged as a strong contender for replacing conventional concrete in diverse construction applications. Critical analysis of the literature on innovative production methods indicates that the one-part production technique is promising for the eliminating design complexity of these mixtures. The pre-setting pressure and hot pressing applications would allow the achievement of superior physical and mechanical characteristics in a short period of time, especially for the precast industry. The workability and setting problems of alkali-activated materials could be overcome using the two-stage concreting methodology. To be used in 3D printing of alkali-activated and geopolymer materials, remarkable development is required in terms of rheological aspects. Accordingly, this paper surveys pertinent and recent literature and critically reviews the state-of-the-art of alternative production techniques of alkali-activated and geopolymeric materials, along with its use in recent applications, identifies pertinent knowledge gaps, and defines future research directions.
AtıfScopus155WoS137OpenAlex167İncele - MakaleAçık Erişim2022Scopus SJRQ2Preliminary investigation of gene expression levels of PAPP-A, STC-2, and HIF-1α in SARS-Cov-2 infected patients
Karabulut Uzunçakmak, Sevgi; Naldan, Muhammet Emin; Dirican, Ebubekir; Kerget, Ferhan; Halıcı, Zekai
Background: Coronavirus-19 is still considered a pandemic that influences the world. Other molecular alterations should be clearer besides the increasing cytokine storm and pro-inflammatory molecules. Hypoxic conditions that induce HIF-1α lead to stimulate gene expression of STC-2 that targets PAPP-A expression. This study aimed to determine gene expression levels of PAPP-A, STC-2, and HIF-1α in COVID-19 infection. We also aimed to reveal the relationship of these genes with laboratory and clinical data of COVID-19 patients. Materials and Results: We extracted RNA from peripheral blood samples of COVID-19(+) and COVID-19(−) individuals. The real-time PCR method was used to measure mRNA expression of PAPP-A, STC-2, and HIF-1α. Gene expression analysis was evaluated by the 2−ΔΔCt method. PAPP-A, STC-2, and HIF-1α mRNA expressions of severe patients were higher than healthy individuals (p = 0.0451, p = 0.4466, p < 0.0001, respectively). Correlation analysis of gene expression patterns of severe patients demonstrated a positive correlation between PAPP-A and STC-2 (p < 0.0001, r = 0.8638). Conclusion: This is the first study that investigates the relation of PAPP-A, STC-2, and HIF-1α gene expression in patients with COVID-19 infection. Besides the routine laboratory findings, PAPP-A, STC-2, and HIF-1α mRNA expressions may be considered to patients’ prognosis as a sign of increased cytokines and pro-inflammatory molecules.
AtıfScopus6WoS6OpenAlex8İncele - MakaleAçık Erişim2020Scopus SJRQ2Superconducting and levitation force characterisation of pyrene added MgB2 bulk superconductors
Erdem, Ozge; Guner, Sait Baris; Celik, Sukru; Kucukomeroglu, Tayfur
This research presents the influence of pyrene (C16H10) addition (0, 2, 4, 6, 8, 10 wt%) on the superconducting properties of bulk MgB2. For C16H10 added MgB2 samples, a shrinkage in a-lattice parameters was determined, whereas c-lattice parameters remained practically unchanged. The (1 1 0) peak observed at 2θ ≈ 59.9◦ slightly shifted to higher angles, the lattice strain increased and the crystallite size reduced after C16H10 addition. By virtue of induced stronger pinning force, the in-field critical current density (Jc) increased after C16H10 addition. The Jc value at 20 K and 4 T was obtained about two times higher (8.54 × 103 A/cm2) for 4 wt% C16H10 added MgB2 sample than that of the pure one. In addition, the variation of levitation force characteristic of MgB2 with increasing C16H10 content was determined at 20, 25 and 30 K. The best vertical levitation force performance in zero-field-cooled regime was obtained as 7.09 N/g at 20 K for 4 wt% C16H10 added MgB2 sample with 13 mm in diameter.
AtıfScopus8WoS6OpenAlex8İncele - MakaleYalnız künye2020Scopus SJRQ2Hand washing in primary school students using “demonstration, puzzle, dance, song”: A nursing project based on multifaceted skills training
Ozcan, Aysegul; Ozdil, Kamuran; Kaya, Senay Sermet; Sezer, Fatma
Background: The effects of an educational strategy, “demonstration, puzzle, dance, song (DPDS),” on the hand washing skills of primary school students was ex-amined. Method: This study used a quasi-experimental, training research format with a pre-and posttest research design and was conducted by a research team from a university department of public health nursing. The study included 671 (90.2%) of 744 students who attended primary schools in Nevsehir, Turkey. Data were collected with a demographic data collection form and a Hand Washing Skills Evaluation List. McNemar, Fried-man, and Wilcoxon tests were used to analyze findings. Results: Immediately after training, all steps of hand washing were performed at higher levels than before training (p < .01), and the difference between hand washing times was significant (p < .001). Conclusion: Hand washing skills and times increased after undergo-ing hand washing training using the DPDS method. [J Contin Educ Nurs. 2020;51(4):158-166.].
AtıfScopus1WoS1OpenAlex6İncele - MakaleYalnız künye2019Scopus SJRQ2Comparative study of hot and cold press and their effect on superconducting properties of coronene added bulk MgB2
Erdem, O.
In this study, the superconducting properties of 4 wt% coronene (C24H12) added polycrystalline bulk MgB2 samples prepared by hot pressing and cold pressing, were reported in detail. The results were compared to determine one of which pressing methods is more useful to substitute of carbon released from C24H12 into MgB2 structure and to increase the superconducting properties of MgB2. The lattice strain, crystallite size, residual resistivity, superconducting transition temperature (Tc), critical current density (Jc), flux pinning force density (Fp) and vertical/lateral levitation force (Fz, Fx) were analysed for the hot and cold pressed samples. The a-lattice parameter and Tc value reduced sharply for 4 wt% C24H12 added cold pressed sample, resulting in a notable decrease of increment ratio of Jc and Fp values, while the depressing of Tc is lower for 4 wt% C24H12 added hot pressed sample. The cold pressing strongly increased the lattice strain, confirming more C substitution, while the hot pressing ensured smaller crystallite size. The Jc and Fp values were respectively found as 4.6 × 103 A/cm2, 1.3 × 104 A/cm2, 5.8 × 103 A/cm2 and 1.8 × 108 N/m3, 5.1 × 108 N/m3, 2.3 × 108 N/m3 for the pure sample and, 4 wt% C24H12 added hot and cold pressed samples at 20 K, 4 T. The maximum repulsive and attractive levitation force values at 20 K in ZFC and FC regimes were obtained for the 4 wt% C24H12 added hot pressed sample. Finally, the hot pressing provides an effective way to substitute C into MgB2 lattice without a remarkable decrease of Tc value, ensuring more homogenous and compacted structure, more electron–phonon interaction and strong flux pinning force.
AtıfScopus6WoS6OpenAlex6İncele - BildiriYalnız künye2020INVESTIGATION OF THE EFFECTIVENESS OF VISCOUS DAMPERS CONNECTED TO ADJACENT BUILDINGS ON DYNAMIC BEHAVIOR UNDER SOIL-STRUCTURE INTERACTION EFFECTS
Hatıpoğlu, Yavuz Selim; Düzgün, Oğuz Akın
In this study, the dynamic behavior of two adjacent structures with fluid viscous damper (FVD) was investigated under the influence of earthquake and considering soil-structure interaction (SSI). Adjacent structures with FVD’s were analysed for three different soil types. The modelling and analysis were made in two-dimensional (2D) space by using ANSYS package program. Viscous boundary conditions were used on the boundaries of 2D soil model. The analyses results were obtained in terms of displacement, acceleration, and shear force. The effect of FVD was investigated using different connection types. The damping coefficient of FVD’s was assumed constant in all analyses. When the results of the analysis are examined, it can be seen that FVD’s are effective for seismic response. However, it is necessary to consider the soil-structure interaction. Significant different structural results were obtained between fixed support and three different soil types. For example, in the same model, while the top floor displacement may reduce in Soil Type I, the top floor displacement may increase in Soil Type II. At the end of the study, it was seen that there was no need to connect the FVD to all floors. It was found sufficient to connect a fluid viscous damper only to the top floor (1 FVD) or to the top and middle floor (2 FVD). FVD’s have no effect on buildings with the similar dynamic character. In the analysis for seismic control of adjacent buildings, the effect of soil-structure interaction should certainly be taken into account.
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