Sürdürülebilir Kalkınma Amaçları

• 10
• 8
• 1
• 1

• MakaleAçık Erişim2026Scopus SJRQ1/r/bayburt/11537
  Modal parameter determination and structural assessment of historical minaret under earthquake and wind loads

  Yanik, Yusuf; Demirtaş, Betül; Yurdakul, Muhammet; Aymelek, Abdullah; Türker, Temel

  This study presents a comprehensive linear time history of a historical masonry minaret called the Grand Mosque Minaret in Bayburt, employing a finite element (FE) model subjected to five distinct real earthquake acceleration records. Ambient vibration tests were conducted within the framework of operational modal analysis (OMA), utilizing enhanced frequency domain decomposition technique to estimate the experimental modal parameters. The FE model, developed under the assumption of linear elastic material behavior, was updated through a vibration-based model updating technique to accurately represent the dynamic characteristics of the structure. Each seismic record was applied as a base excitation, and the corresponding time-dependent structural responses were computed for initial and updated FE models. The analysis yielded critical engineering parameters, including maximum displacement and minimum–maximum principal stress distributions. The results obtained from the FE analyses were evaluated comparatively. Also in this study, the wind loads of the minaret were determined using the TS 498 standard, and structural wind load analyses were performed on the initial and updated FE models. Drift ratio values of the minaret were calculated for earthquake records and wind loads, and the structural performance of the minaret was evaluated comparatively for both models. It has been found that the structural behavior of the minaret was significantly affected by earthquakes. The drift ratio values remained within the controlled damage limit for wind analyses, while earthquake analyses indicated that the minaret was mostly in the collapse limit. The results show that more effective conservation and restoration strategies for cultural heritage structures can be developed by using both FE and experimental methods.

  • 
  İncele
• MakaleYalnız künye2026Scopus SJRQ2/r/bayburt/11269
  Seismic performance of prestressed girder bridges considering soil-pile-structure interaction and isolation systems

  Öner, Erdal; Aydoğan, Ayşe N.; Yurdakul, Muhammet; Ergün, Mustafa; Artar, Musa

  This article presents a comprehensive numerical study to determine the seismic performance of the Kirazlıyalı Çenesuyu Bridge, currently in service in Kocaeli, Türkiye, under both seismically isolated and non-isolated conditions, considering different soil types. The study holds great importance due to Kocaeli’s status as one of Türkiye’s most developed industrial regions, its location in a high-seismic-risk area, and its complex geological structure. The Kirazlıyalı Çenesuyu Bridge is a structure consisting of simply supported prestressed girders, commonly used in highway transportation networks. Designed as a twin bridge, the structure is 134 meters in length and 20 meters in width. Currently, the bridge is not equipped with seismic isolators; instead, its superstructure rests on elastomeric bearings over abutments and piers. Within the scope of this study, the bridge was retrofitted with Single Curved Friction Pendulum (SCFP) seismic isolators. These SCFP isolators were specifically designed in accordance with the Turkey Building Earthquake Code (TBEC-2019) standards for two distinct soil classes: ZA (hard rock) and ZC (very dense sand and gravel). The soil-pile interaction was simulated using single-parameter Winkler spring models in both horizontal and vertical directions. The Finite Element Model (FEM) of the bridge was developed in SAP2000 software, and analyses were conducted on this platform. The seismic performance of the bridge was assessed through nonlinear dynamic time history analyses using real earthquake ground motion records from the Imperial Valley, Kocaeli, and Kahramanmaraş (Pazarcık) earthquakes under various scenarios. The seismic responses of the bridge were examined in terms of base shear forces, lateral displacements of the pile, shear forces at the pier, bending moments at the pier, deck accelerations, and the hysteresis curves of the isolator. The study results demonstrate significant improvements in the seismic behavior of the bridge when equipped with the seismic isolation system. Furthermore, these improvements are shown to be directly influenced by the interaction of the structure-pile-soil system, as well as the compatibility between the frequency characteristics of this system and the frequency content of the imposed earthquake. The numerical data supporting these results are presented in the relevant sections through tables and graphs.

  AtıfScopus2·WoS2

  İncele
• MakaleAçık Erişim2021Scopus SJRQ1/r/bayburt/13510
  Investigation of time-history response of a historical masonry minaret under seismic loads

  Yurdakul, Muhammet; Yılmaz, Fatih; Artar, Musa; Can, Ömer; Öner, Erdal; Daloğlu, Ayşe T.

  This study presents an investigation of the seismic performance of a historical masonry minaret which was built in the 12th century in Bayburt. The minaret was built as masonry with regional stones and handmade bricks. The most important feature of the minaret is its longitudinally conical geometry. An experimental investigation was made to obtain the mechanical properties of the regional stone used in the historical minaret. A three-dimensional Finite Element Model of the historical minaret was created in SAP2000. Three earthquake ground motions such as Erzincan, Kocaeli-Duzce, and Van-Ercis were used to investigate the seismic performance of the historical minaret. The results show that Erzincan, Kocaeli-Duzce and Van-Ercis earthquakes may cause some damages in the same zone of the minaret body since the tensile stresses occurred due to the earthquakes exceed the limit tensile stress of the masonry brick. The use of the data obtained from the experimental investigation of the Bayburt yellow stone in the analysis is important for the reliability of the results.

  • 
  AtıfScopus44·WoS43·OpenAlex44

  İncele
• MakaleAçık Erişim2020/r/bayburt/14988
  A study on seismic isolation of building used LRB

  Yurdakul, Muhammet; Yildiz, Burak

  Base isolation system with lead rubber bearing (LRB) is commonly used to preventstructure against to damage of earthquake. Design of LRB system is detailed in thisstudy. The isolated building with LRB design according to Uniform Building Code(UBC-97) and fixed building were examined. The six-storey building with LRB andfixed building were modelled in SAP2000 with the same dynamic loads. The relativefloor displacement and internal forces of the seismic isolated and fixed building arecompared. In addition, transverse and longitudinal reinforcement of any axis of seismic isolated and fixed building are compared. Analyse results showed that effectiveness of using seismic isolation system on building. The weight of longitudinal andtransverse reinforcement of isolated building is smaller than fixed building about36%, 40% respectively.

  • 
  • 
  AtıfOpenAlex2·TR Dizin1

  İncele
• MakaleYalnız künye2020/r/bayburt/13331
  DYNAMIC BEHAVIOUR OF HISTORICAL BAYBURT GRAND MOSQUE

  Yurdakul, Muhammet; Yilmaz, Fatih; Artar, Musa

  In this study, the locations of the damages that would occur when a historical building was exposed to different earthquakes were determined. The selected building is Bayburt Ulu Mosque located in the city center of Bayburt and it was built by the Anatolian Seljuk Sultan II. Gıyaseddin. This selected historical building is modelled according to the macro modelling technique in the SAP2000 program using the finite element method. Modules of elasticity, poisson's ratio and weight per unit of volume of Bayburt Stone which is used in the mosque are determined by the experiment. Also, the properties of the ground on which the building was built are determined. As earthquake records which recorded on similar grounds, components of DZC180 and DZC270 of 17 August 1999 Kocaeli earthquake, components BOL000 and BOL090 of 12 November 1999 Düzce earthquake and components of ERZE-EW and ERZE-NS of 13 March 1999 Erzincan earthquake are used. In the results of the dynamic analysis made, quantities and locations of the strains that can occur in the historic mosque are determined.

  İncele
• MakaleYalnız künye2019Scopus SJRQ2/r/bayburt/13779
  Investigation on seismic isolation retrofit of a historical masonry structure

  Artar, Musa; Çoban, Keziban; Yurdakul, Muhammet; Can, Ömer; Yilmaz, Fatih; Yildiz, Mehmet B.

  In this study, seismic vulnerability assessment and seismic isolation retrofit of Bayburt Yakutiye Mosque is investigated. Bayburt Yakutiye Mosque was built in the early 19th century at about 30-meter distance to Coruh river in the center of Bayburt in Turkey. The walls of historical masonry structure were built with regional white and yellow stones and the domes of the mosque was built with masonry bricks. This study is completed in four basic phases. In first phase, experimental determination of the regional white stone used in the historical structure are investigated to determine mechanical properties as modulus of elasticity, poison ratio and compression strengths etc. The required information of the other materials such as masonry brick and the regional yellow stone are obtained from literature studies. In the second phase, three dimensional finite element model (FEM) of the historical masonry structure is prepared with 4738 shell elements and 24789 solid elements in SAP2000 software. In third phase, the vulnerability assessment of the historical mosque is researched under seismic loading such as Erzincan (13 March 1992), Kocaeli (17 August 1999) and Van (23 November 2011) earthquakes. In this phase, the locations where damage can occur are determined. In the final phase, rubber base isolators for seismic isolation retrofit is used in the macro model of historical masonry mosque to prevent the damage risk. The results of all analyses are comparatively evaluated in details and presented in tables and graphs. The results show that the application of rubber base isolators can prevent to occur the destructive effect of earthquakes.

  • 
  • 
  AtıfScopus12·WoS12·OpenAlex6

  İncele
• MakaleYalnız künye2018Scopus SJRQ1/r/bayburt/12570
  Stochastic responses of isolated bridge with triple concave friction pendulum bearing under spatially varying ground motion

  Yurdakul, Muhammet; Ates, Sevket

  This study aims to investigate the stochastic response of isolated and non-isolated highway bridges subjected to spatially varying earthquake ground motion model. This model includes wave passage, incoherence and site response effects. The wave passage effect is examined by using various wave velocities. The incoherency effect is investigated by considering the Harichandran and Vanmarcke coherency model. The site response effect is considered by selecting homogeneous firm, medium and soft soil types where the bridge supports are constructed. The ground motion is described by power spectral density function and applied to each support point. Triple concave friction pendulum (TCFP) bearing which is more effective than other seismic isolation systems is used for seismic isolation. To implement seismic isolation procedure, TCFP bearing devices are placed at each of the support points of the deck. In the analysis, the bridge selected is a five-span featuring cast-in-place concrete box girder superstructure supported on reinforced concrete columns. Foundation supported highway bridge is regarded as three regions and compared its different situation in the stochastic analysis. The stochastic analyses results show that spatially varying ground motion has important effects on the stochastic response of the isolated and non-isolated bridges as long span structures.

  • 
  • 
  AtıfScopus13·WoS13·OpenAlex6

  İncele
• MakaleYalnız künye2017/r/bayburt/14279
  Mechanical Properties of Conventional Concrete Produced With Different Type of Aggregates in Bayburt Region

  Tekin, Ilker; Kotan, Turkay; Yurdakul, Muhammet; Öner, Erdal

  In this study, the limestone, natural aggregate, serpentine and Bayburt stone located in the province of Bayburt used as aggregate in conventional concrete production. In the experiments, the cement dosage and workability were kept constant. Slump, Ve-Be, unit weight and the highest temperature values in first 2 hours of the fresh concrete were measured. The concrete samples prepared with Bayburt stone were cured for 90 days and the others were cured for 28 days in lime-saturated water. Strain-stress data and water absorption values were measured on the hardened concretes at 7 and 28th days age through the records of stress and strain data during compressive strength tests. According to results of this study, the compressive strengths of the concrete samples with limestone, natural aggregate and serpentine were on average of 40, 35 and 5 MPa, respectively, on the 28th day. Also, in concrete samples with Bayburt stone, the compressive strengths were reached to 16 MPa for 28 days and to 22 MPa for 90 days.

  • 
  • 
  AtıfWoS4·OpenAlex3

  İncele
• BildiriAçık Erişim2017Scopus SJRQ3/r/bayburt/13611
  Evaluation of marble dust for soil stabilization

  Yilmaz, F.; Yurdakul, M.

  Usage of marble dust was investigated for soil stabilization in the scope of utilization of waste material. Geotechnical properties, such as compaction, Atterberg limits, unconfined compressive strength of the mixtures and changes of these properties with the marble dust ratio were determined. From the test results it is seen that marble dust increases the mechanical properties of soil and application of dust wastes for soil stabilization will be an efficient practice in terms of solid waste management.

  • 
  AtıfScopus20·WoS11·OpenAlex23

  İncele
• MakaleYalnız künye2014Scopus SJRQ2/r/bayburt/12258
  Comparison of the dynamic responses of gülburnu highway bridge using single and triple concave friction pendulums

  Yurdakul, Muhammet; Ates, Sevket; Altunisik, Ahmet Can

  The main object of this study is to determine and compare the structural behavior of base isolated long span highway bridge, Gülburnu Highway Bridge, using single concave friction pendulum (SCFP) and triple concave friction pendulum (TCFP). The bridge is seismically isolated in the design phase to increase the main period and reduce the horizontal forces with moments using SCFP bearings. In the content of the paper, firstly three dimensional finite element model (FEM) of the bridge is constituted using project drawings by SAP2000 software. The dynamic characteristics such as natural frequencies and periods, and the structural response such as displacements, axial forces, shear forces and torsional moments are attained from the modal and dynamic analyses. After, FEM of the bridge is updated using TCFP and the analyses are performed. At the end of the study, the dynamic characteristics and internal forces are compared with each other to extract the TCFP effect. To emphasize the base isolation effect, the non-isolated structural analysis results are added to graphics. The predominant frequencies of bridge non-isolated, isolated with SCFP and isolated with TCFP conditions decreased from 0.849Hz to 0.497Hz and 0.338Hz, respectively. The maximum vertical displacements are obtained as 57cm, 54cm and 44cm for non-isolated, isolated with SCFP and isolated with TCFP conditions, respectively. The maximum vertical displacement reduction between isolated with TCFP bearing and isolated with SCFP bearing bridge is %23. Maximum axial forces are obtained as 60619kN, 18728kN and 7382kN, maximum shear forces are obtained as 23408kN, 17913kN and 16249kN and maximum torsional moments are obtained as 24020kNm, 7619kNm and 3840kNm for non-isolated, isolated with SCFP and isolated with TCFP conditions, respectively.

  • 
  • 
  AtıfScopus5·WoS4·OpenAlex3

  İncele