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Yayın Advances in physical and mechanical properties of wheat straw ash-substituted cement mortar(Bauverlag Bv Gmbh, 2021) Biricik, H.; Kirgiz, Mehmet Serkan; Karapinar, Isil Sanri[Abstract Not Available]Yayın Determining the optimum outrigger locations for steel tall buildings by using time history analyses(Wiley, 2021) İnam, İlhan Emre; Ceribasi, Seyit; Karapinar, Isil SanriThe outrigger system is an effective tall building system used at one or multiple locations of high-rise buildings. It is designed to control and minimize lateral displacement and to increase bending stiffness of the buildings by changing the load transfer mechanism of the structural systems. This paper presents a framework for estimation of the optimum location of the outriggers with structural engineering design approach. Three different sample high-rise buildings, 35-story 140-m, 40-story 160-m, and 45-m 180-m, were investigated. A time-history analysis method was used to examine the effects of earthquakes. In the first stage, the buildings were assumed to have one outrigger. The outrigger was put on each floor, and ETABS analysis models were created. For each different sample buildings, 35, 40, and 45 different analytical models were utilized for that stage, respectively. In the second stage, in case of outrigger in two positions, all combinations in which outriggers can be located in different positions were taken into consideration for only 40-story sample building. Considering all of the possible cases, where the steel high-rise building has 40 floors and the outriggers can be in two different locations, 780 different analysis models were used.Yayın Dynamic properties of steel structures under different construction stages, ambient temperature and live load(Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2021) Aras, Fuat; Karapinar, Isil SanriOperational modal analysis (OMA), assessing the effect of environmental conditions on the structures has been attracting widespread interest and its results have been used for the validation of numerical models. This paper aims to validate the application of OMA on steel buildings to investigate their dynamic behavior during and after their construction. In this context, the construction stages of a steel building were monitored. With the completion of the construction, the dynamic tests were applied at different times to identify the changes in the modal characteristics of the building with respect to the temperature and service loads. Finally, the analytical model of the building was performed and the building's dynamic properties were determined numerically. As a result, the experimentally obtained dynamic properties for the completed building were compared to those derived from numerical analysis. The results underlined the importance of slab construction for the formation of building behavior in the construction stages. Besides the effects of ambient temperature and service load on the dynamic properties of steel buildings were revealed. Finally, the lack of partition walls in the numerical model has been grasped as the main reason behind the differences between the experimentally and numerically obtained dynamic properties.Yayın Evaluation of the Microstructure and Mechanical Properties of Biopolymer-Based Cementitious Composites with Silver Nanoparticles(Asce-Amer Soc Civil Engineers, 2023) Pehlivan, Ahmet Onur; Karapinar, Isil Sanri; Karakuş, Selcan; Özsoy Özbay, Ayşe Elif; Yazgan, Ahmet UtkuThis study investigated the effects of using silver nanoparticles (Ag NPs) on the microstructure and mechanical properties of cementitious composites. Ag NPs were synthesized with an ultrasonic irradiation method using konjac gum-polyethylene glycol (KG/PEG) and locust gum-polyethylene glycol (LG/PEG) and characterized using scanning electron microscopy (SEM), energy dispersive X-ray (EDX), high-resolution transmission electron microscopy (TEM), and Fourier-transform infrared (FTIR) analyses. To identify the effect of the Ag NPs on the mechanical properties of mortar, four different cement mortar mixtures were prepared with varying percentages of Ag NPs (0%, 0.5%, 1%, 2%, 3%, 4%, and 5% by weight). Clear improvements were observed in the 7- and 28-day compressive and flexural strengths of nanocomposites with Ag NPs. A thorough microstructure investigation using SEM, EDS, XRD, and thermogravimetric analysis (TGA) was presented, and the relationship between microstructure and the mechanical properties of cementitious composites including Ag NPs was discussed.Yayın Improvement of mechanical strength of mortars by different morphological zinc oxide nanoparticles(Ice Publishing, 2022) Yazgan, Ahmet Utku; Karakuş, Selcan; Pehlivan, Ahmet Onur; Karapinar, Isil Sanri; Özsoy Özbay, Ayşe Elif; Taşaltın, Nevin; Kilislioğlu, AybenThis study presents novel nano-mixtures containing zinc oxide (ZnO) nanoparticles (NPs) to enhance the mechanical properties of cement mortars. Different morphological ZnO NPs were synthesised through the green sonochemical method, using tragacanth gum/Kappa carrageenan (TG/kappa-C) and tragacanth gum/chitosan (TG/CS) as biopolymer matrices. The ZnO NPs were characterised using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, X-ray diffraction, Zetasizer and Brunauer-Emmett-Teller techniques. The intrinsic viscosities of TG/kappa-C-ZnO and TG/CS-ZnO NPs were investigated to determine the miscibility of the polymeric blends in aqueous solution as affected by sonication time and composition ratios. The average diameters for the spherical and prism-like ZnO NPs were around 266 nm and 355 nm, respectively. Seven different cement mortar specimens containing TG/kappa-C-ZnO and TG/CS-ZnO NPs were prepared in ratios of 0, 0.1, 0.5 and 1% by weight, and the flexural and compressive strengths of the specimens were determined at the ages of 7 and 28 days. The results indicate that there is a significant improvement in the mechanical performance of different morphological ZnO NP-based cement mortar composites. In comparison, it was observed that specimens containing TG/kappa-C-ZnO NPs had much better results than TG/CS-ZnO NPs. Moreover, the workability problem encountered by using only ZnO NPs has been overcome with the presented biopolymers used in this study.Yayın Improvement of the mechanical properties of cementitious composites by the novel synthesized borophene nanosheets(Sage Publications Ltd, 2022) Karapinar, Isil Sanri; Pehlivan, Ahmet Onur; Özsoy Özbay, Ayşe Elif; Yazgan, Ahmet Utku; Taşaltın, Nevin; Karakuş, SelcanThis study is the first investigation focused on the preparation of novel synthesized borophene nanosheets and their use in cementitious composites. The two-dimensional beta borophene was prepared by a facile and low-cost sonication process including ultrasonic cavitations. To understand the effect of the novel synthesized borophene nanosheets, varying ratios of 0, 0.5, 1, 2, 3, and 5 wt% of cement were incorporated in cement composites and improvements on the mechanical strength, workability, and toughness were identified. Also, for the microstructure evaluation, several advanced characterization techniques including SEM, EDS, XRD, and TGA were presented and the relationship between the microstructure and mechanical properties of cementitious composites modified with borophene nanosheets was discussed. As a result of this study, with the incorporation of the borophene nanosheets, clear improvements were achieved for the 28 day compressive and flexural strengths of the specimens within a range of 5-19% and 4-13%, respectively. The findings also indicated that borophene nanosheets contributed to the formation of a denser microstructure of the corresponding cement composites. Thus, within this study, the utility of as-prepared borophene nanosheets in cementitious composites is proved and proposed as a two-dimensional potential nanomaterial candidate to be used in cementitious composites.Yayın Mechanical Properties of Cement Mortars Incorporating Zero-Valent Iron Nanoparticles(Asce-Amer Soc Civil Engineers, 2022) Özsoy Özbay, Ayşe Elif; Karapinar, Isil Sanri; Yazgan, Ahmet Utku; Pehlivan, Ahmet Onur; Karakuş, Selcan; Taşaltın, Nevin; Kilislioğlu, AybenIn this study, the effects of zero-valent iron (ZVI) nanoparticles (NPs) on the mechanical performance of cementitious composites were investigated. For this purpose, the use of a novel nanomaterial containing ZVI NPs blended with carboxymethyl cellulose (CMC) and SiO2 was introduced. CMC/SiO2-ZVI NPs were prepared by a green and low-cost sonochemical method at room temperature and characterized using scanning electron microscopy/energy dispersive X-ray spectroscopy, thermal gravimetry analysis, Brunauer-Emmett-Teller, and X-ray diffraction techniques. The values of intrinsic viscosities of CMC/SiO2-ZVI NPs were examined to determine the optimal miscible condition as affected by the different mass ratios of CMC/SiO2 and sonication time. Then, eight different cement mortar specimens containing CMC/SiO2 and CMC/SiO2-ZVI NPs were prepared in ratios of 0.2%, 0.5%, 1%, and 2% by weight, and flexural and compressive strengths of the specimens were determined at the ages of 7 and 28 days. The microstructure of the specimens was also evaluated. Comprehensive results proving the improvement in the mechanical properties have been obtained in the specimens containing 1% and 2% CMC/SiO2-ZVI NPs. (C) 2021 American Society of Civil Engineers.Yayın Pozzolanic activity of central Anatolian volcanic tuff and its usablilty as admixture in mortar(Ice Publishing, 2020) Biricik, Hasan; Karapinar, Isil SanriThe mechanical and physical properties of volcanic tuffs from central Anatolian province were investigated for use as admixtures in pozzolanic cement. Five different cement mortar specimens were prepared by replacing cement with volcanic tuff in ratios of 0, 15, 25, 35 and 45% by mass. The flexural and compressive strengths of the specimens were determined at the ages of 7, 28 and 56 d. The effects of the tuff replacement ratio on workability, setting time and volume expansion were also examined. Based on the results, it was concluded that central Anatolian volcanic tuff has pozzolanic activity and is suitable for use as an alternative adherent material in the cement industry.Yayın Synthesis of novel chitosan/modified zeolite nanocomposites and their effect on the mechanical properties of cement mortars(Stowarzyszenie Producentow Cementu, 2021) Karakuş, Selcan; Karapinar, Isil Sanri; Pehlivan, Onur; Özbay, Aye Elif Özsoy; Yazgan, UtkuIn this paper, a novel nanocomposite containing biodegradable chitosan [CS] and modified zeolite [mZeo] was introduced as a cement eco-nano additive and its effects on the mechanical properties of cement mortars were evaluated. The proposed nanocomposite was prepared by using a synergistic sonication-microwave method. The surface morphology and chemical compositions of mZeo and CS/mZeo nanocomposites were determined using SEM, FTIR, XRF, and BET. Compressive and flexural strength of cement mortars containing mZeo and CS/mZeo in ratios of 0%, 0.2%, 0.5%, 1% and 2% by mass, were investigated. Experimental results showed a significant improvement in the mechanical properties of mortars containing the proposed nanocomposite. The use of nanoscale zeolite in cementitious composites was attempted for the first time within this study and the results so far have been very promising. Therefore, it is concluded that the proposed nanocomposite has great potential to be used as an alternative eco-nano additive, for cementitious composites.Yayın Visualization of seismic vulnerability of buildings with the use of a mobile data transmission and an automated GIS-based tool(Elsevier Science Inc, 2020) Özsoy Özbay, Ayşe Elif; Karapinar, Isil Sanri; Unen, Hüseyin CanThis paper aims to introduce a computer-aided rapid visual screening framework and establish a prioritization strategy for seismic vulnerability evaluation of reinforced concrete buildings. A methodology is developed to organize and visualize the results of visual screening method with a GIS-oriented database system. Throughout the study, the primary rationale behind conducting the field data collection via utilization of spatial processes is to achieve a standardized and efficient data flow in the presence of multiple data collectors on the field, working in coordination. Incorporated in the process are mobile data collection tools with cloud-support, open online spatial databases, and open-source GIS software. The utilization of these tools instead of paper forms would lead to readily available standardized responses via digital forms, avoiding loss and fragmentation of data and ambiguities in classification, where multiple users contribute to the same repository. In addition, the use of digital tools in field data collection eliminates the data transcription process, significantly reducing the time required for it. Hence, the proposed framework has the potential to represent a fast and reliable overview of structural seismic vulnerability as well as seismic priority for strengthening. As a result of this study, the mobile data transmission in the field and the visualization in GIS are highly recommended to be a standard part of the seismic evaluation procedure.
