Comparison of the dynamic responses of gülburnu highway bridge using single and triple concave friction pendulums

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. © 2014 Techno-Press, Ltd

A skeletochronological study of the smooth newt Lissotriton vulgaris (Amphibia: Urodela) from an island and a mainland population in Turkey

WOS: 000342305800009To understand the effects of island and mainland on life history traits (e. g. longevity, age at maturity, body size and body mass) of the smooth newt Lissotriton vulgaris (Linnaeus, 1758), we generated data on age and body measurements for an island (Bozcaada) and a mainland (Canakkale) population in northwestern Turkey. Age was determinated by skeletochronology. the maximum life span was 4 years in the island population and 5 years in the mainland population. Age at maturity was estimated to be 2-3 years for both sexes and the populations. While mean snout-venth length (SVL) was calculated as 35.56 mm for females and 31.95 mm for males in the mainland population, it was found to be 32.83 mm for females and 31.78 mm for males in the island population. Females from the mainland population were found to be significantly larger and heavier than those of the island population. A significant positive correlation was found between SVL and age for only males in the mainland population. Unexpectedly, age was not correlated with body size for the island individuals. Since there were hardly any demographic studies on any Urodela species comparing island and mainland populations, in this paper we contribute to the literature on this subject.Scientific and Technological Research Council of Turkey (TUBITAK Project)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [112T063]This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK Project No. 112T063)

AGE STRUCTURE OF THE CAUCASIAN AGAMA (Paralaudakia caucasia) FROM ELMADAG, IGDIR, TURKEY: PRELIMINARY DATA FROM SMALL SAMPLE SIZE

WOS: 000426383300006Life history traits of lizard species, including agamid species, generally involve male-larger body size, but age of these species has not adequately been examined in each cohort. We thus conducted a skeletochronological study using 16 preserved specimens of Paralaudakia caucasia (8 males, 6 females, and 2 juveniles) captured from Elmadag, Igdir, Turkey. Mean snout-vent length was slightly but insignificantly larger in males (120.2 mm) than in females (115.9 mm). Maximum longevity was 10 years in males and 6 years in females. No significant difference in age structure was found between the sexes. Juveniles were 2-year old young. Mean age was 7.12 years for males and 5.33 years for females. Sexually matured individuals were found at the end of the second or third years (i.e., first reproduction occurred at 3 - 4 years). A positive correlation was detected in age and body size in both sexes, as has previously been shown in other lizard species. Our finding of age structure in P. caucasia would contribute to our understanding of life-history trait variations among lizard species

Views and experiences of dermatologists in Turkey about teledermatology during the COVID‐19 pandemic

Background Teledermatology is an alternative medical science that allows evaluation of patient's clinical information over a distance without requiring face-to-face examination. Due to COVID-19, social distancing has become important these days, and teledermatology can help physicians and patients in overcoming the barriers of accessing health care. Aim In this study, we aim to evaluate how dermatologists in our country have viewed and experienced teledermatology during the pandemic through surveys. Patients/Methods The study was carried out by using an online survey for evaluating the teledermatology experiences of dermatologists in Turkey and how they have viewed teledermatology during the 2-month pandemic period and the 2-month prepandemic period. Results The number of patients evaluated with teledermatology methods was found to be significantly higher in the pandemic period when compared with the prepandemic period. The rates of using video calls with mobile phone and online video calls were found to be significantly higher in the pandemic period when compared with the prepandemic period. Conclusion Our study results show that the teledermatology method had a higher rate of usage compared to before the pandemic

StEER 2022 Mw 6.1 Duzce, Turkey Earthquake Preliminary Virtual Reconnaissance Report (PVRR)

An earthquake occurred in Duzce, Turkey on Nov. 23, 2022 with magnitude of 6.1 and a depth of 10.0 km. The region has been struck by several destructive earthquakes in the past decades. The vast majority of the buildings in the region affected by the earthquake, including government and school buildings, have been either retrofitted or rebuilt after the Aug.17, 1999 Mw 7.6 Kocaeli and Nov. 12, 1999 Mw 7.2 Duzce earthquakes. No structural damage and nonstructural damage were reported in these buildings during this event. This low level of damage shows the effectiveness of retrofit measures and recent strict seismic design requirements enforced for the buildings constructed after 1999. In general, limited collapses and structural damage were observed. However, the economic losses due to nonstructural damage and business interruption were significant. There were no reports of damage to roads and bridges, and power, water, telecommunications, and other infrastructure and lifelines. This project encompasses the products of StEER’s response to this event: Preliminary Virtual Reconnaissance Report (PVRR)