Civil Engineering

Permanent URI for this collectionhttps://hdl.handle.net/10679/312

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Browsing by Institution Author "ÇİNİCİOĞLU, Safiye Feyza"

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    Design method for quantifying embankment safety against lateral spreading and determining contribution of basal reinforcements
    (Elsevier, 2020-06) Oser, C.; Çinicioğlu, Safiye Feyza; Çinicioğlu, Ö.; Civil Engineering; ÇİNİCİOĞLU, Safiye Feyza
    This study proposes an analytical method for the calculation of the safety factor against lateral spreading in embankments, both for cases with and without basal reinforcement. Hence, a new limit equilibrium approach is presented based on the lower bound plasticity theorem, which allows the computation of the required distribution of stresses along presumed slip surfaces at the limit state. Comparing the required distribution of stresses with the available resistances, the safety factor in the absence of basal reinforcement is calculated. If the safety factor is unsatisfactory, basal reinforcement can be introduced and its contribution to stability quantified. The lower bound approach allows the computation of mobilized resistance along the reinforcement. Accordingly, the proposed method allows the calculation of the safety factor against lateral spreading for problems involving basal reinforcements. Finally, the proposed method is compared with well-established methods in literature. Results suggest that the proposed method is reliable, practical, and applicable to safe and economical designs.
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    Impact of neighbouring deep excavation on high-rise sun plaza building and its surrounding
    (Elsevier, 2020-04) Oztoprak, S.; Çinicioğlu, Safiye Feyza; Oztorun, N. K.; Alhan, C.; Civil Engineering; ÇİNİCİOĞLU, Safiye Feyza
    A deep excavation was carried out at the border of 38-story Sun Plaza Tower in Istanbul with a shoring that made use of temporary anchorages. However, building construction license was cancelled due to later detected legal issues. Since the structure could not have been placed timely, useful lifetime of temporary anchorages expired and safety concerns appeared. It led to rumors such as cracks appearing in the Tower and even became headlines in newspapers which led to loss of tenants. Here, technical and legal problems, which have arisen from this extraordinary situation, are discussed. Site investigations, numerical modeling and analyses conducted, and solution alternatives developed for this complex problem, which requires an interdisciplinary study, are explained in detail. The actual application of the proposed solution and the positive outcome in terms of both ensuring structural safety and gaining new tenants are also reported. It is expected that this study will draw attention to potential technical and legal problems that may arise in densely populated city centers where high-rise structures are continuously being constructed side by side.
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    Conference ObjectPublicationOpen Access
    A new embankment construction method through the analysis of possible failure mechanisms in soft soils
    (International Society for Soil Mechanics and Geotechnical Engineering, 2019) Arama, Z. A.; Çinicioğlu, Safiye Feyza; Civil Engineering; ÇİNİCİOĞLU, Safiye Feyza
    A new method to analyze the failure behavior of embankments on soft soils is proposed in this paper. The proposed method is based on the evaluation of stability considerations applied on a possible mechanism which can be initiated by embankment loading. The developed procedure is applied on a successive set of failure mechanisms that extend towards depth starting from the surface. The envisaged mechanism is made up of concentric half circles starting from the toe of the embankment and spreading towards the deeper soils. By partitioning the circular strips by a slip fan system originating from the center of concentric circles a system of collapse mechanism partitioned to produce finite elements is created. Available stress values at each element are found by applying the rules of the lower bound plasticity solution. Once the stresses and the dimensions of the constructed mechanism are defined stability calculations are made to find the critical depth that will result in failure for any desired embankment height. Moreover safety factors mobilized at lower depths can be calculated. © The authors and IGS: All rights reserved, 2019.
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    Preface
    (Springer, 2023) Atalar, C.; Çinicioğlu, Safiye Feyza; Civil Engineering; ÇİNİCİOĞLU, Safiye Feyza
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    Yumuşak zeminler üzerinde dolgu inşasında temel zemini göçmesine dayalı tasarım yaklaşımı
    (TMMOB İnşaat Mühendisleri Odası, 2019-09) Arama, Z. A.; Çinicioğlu, Safiye Feyza; Civil Engineering; ÇİNİCİOĞLU, Safiye Feyza
    In order to tackle the difficulties encountered in embankment design and construction, a new design method for embankments on soft clays is proposed in this paper. The method approaches to the problem with the philosophy of allowing controllable failures at small depths. Foundation soils are scanned through by applying a limit equilibrium approach specifically developed for the embankment problem and considering different slip planes at various depths. The purpose is to find the depth and the location of the failure region which gives a safety factor value of unity and also values of the safety factors which were mobilized at different depths under an embankment of considered height. Numerical applications of the method are compared with the results of two different commercial software which are developed with finite element and limit state methods.