Yazar "Taskiran, Taha" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    The effects of freeze-thaw (F-T) cycles on the Godene travertine used in historical structures in Konya (Turkey)
    (Elsevier, 2016) Gokce, Mehmedi Vehbi; Ince, Ismail; Fener, Mustafa; Taskiran, Taha; Kayabali, Kamil
    Travertine, a building material used around the globe for its decorative and easy-to-be-worked features from past to present, is naturally exposed to the freeze-thaw (F-T) process in cold regions in winters. As a result of this process, building stones deteriorate partially or completely. The greatest factor during the F-T process is the existence of water. The water contained in the body (in discontinuities and pores) of a building stone freezes along with the fall of temperature below 0 degrees C. Following freezing, the volume of water contained in discontinuities and pores increases. New fractures develop on the surfaces of pores as a result of outward pressure due to this increase in volume. As the temperature drops below 0 degrees C, the volume of water increases again, due to freezing. This process repeats itself with the decrease and increase in temperature and causes undesired deteriorations in the bodies of stones. This issue is quite important from the point of view of preservation and restoration of historical buildings, and foreseeing the effects of the F-T process on new buildings to be designed. In this study, the effects of the F-T process on Godene travertine were investigated. Godene travertine is a stone that has been widely used in historical buildings in Konya, a city that also covers catal Hoytik, which is known as one of the oldest human settlements in Anatolia. The stone is still being used in buildings constructed in the region. Fresh travertine stones obtained from the quarry were exposed to freeze and thaw cycles in different numbers. Values of porosity (n), uniaxial compressive strength (sigma(u)), point load strength (I-s(50)), Brazilian tensile strength (sigma(t)), Bohme abrasion loss (BA) and P wave velocity (V-p) were statistically evaluated and thus, the effects of the number of cycles on basic physical and mechanical characteristics of the Godene stone were investigated. Furthermore, deteriorations that took place in historical structures in the region were case-studied. (C) 2016 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Investigation of blast-induced ground vibration effects on rural buildings
    (Techno-Press, 2015) Oncu, Mehmet Emin; Yon, Burak; Akkoyun, Ozgur; Taskiran, Taha
    In this paper, blast-induced vibration effects on buildings located in rural areas were investigated. Damages to reinforced concrete, adobe and masonry buildings were evaluated in Catakkopru and Susuz villages in Silvan district of Diyarbakir, Turkey. Blasting of stiff rocks to construct highway at vicinity of the villages damaged the buildings seriously. The most important reason of the damages is lack of engineering services and improper constructed buildings according to the current building design codes. Also, it is determined that, inappropriate blast method and soft soil class increased the damages to the buildings. The study focuses on four points: Blast effect on buildings, soil conditions in villages, building damages and evaluation of damage reasons according to the current Turkish Earthquake Code (TEC).
  • [ X ]
    Öğe
    AN UNSATURATED-SOILS APPROACH TO THE BEARING CAPACITY OF FOUNDATION STRUCTURES
    (Univ Maribor, 2017) Taskiran, Taha
    Unsaturated soils are maintaining their importance for researchers and there is still much need to investigate the many engineering aspects of these soils. A new technique is proposed here to predict the variation of the bearing capacity of unsaturated soils with matric suction. The proposed method is an extension of conventional bearing-capacity theories and conceptually based on the logarithmic model of the shear strength of unsaturated soils, which only include one unknown, unsaturated parameter (the air-entry value, AEV). The possibility of predicting the unsaturated bearing capacity of soils is shown by the saturated effective shear-strength parameters c' and empty set' and the AEV from the soil-water retention curve (SWRC). Considering the necessity of validating new methods with other researchers' data, the proposed equation is tested using the published unsaturated experimental study by the author, in addition to some reported experimental studies on the shear strength for unsaturated soils and also a model footing loading on unsaturated sand under controlled suction conditions. The results of the study indicate that there is a good comparison between the unsaturated bearing capacities obtained via predicted and measured unsaturated strength parameters (c(total), empty set) and also between the measured/calculated bearing values of a model footing loading. Consequently, it is shown that, without needing complex unsaturated testing facilities, the proposed equation is capable of predicting the unsaturated bearing capacity for both fine-grained and sandy soils, requiring only one unsaturated parameter, which can be obtained from the SWRC or predicted using the basic soil-index properties.