Dalgıç, Korhan Deniz
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Dalgic, K. Deniz
Dalgic, Korhan Deniz
Dalgıç, K. Deniz
Dalgic, Korhan Deniz
Dalgıç, K. Deniz
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korhandenizdalgic@iyte.edu.tr
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03.03. Department of Civil Engineering
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14
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7
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9
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174
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13
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38
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51
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2.92
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3.92
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3
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2
| Journal | Count |
|---|---|
| Earthquake Spectra | 1 |
| Engineering Structures | 1 |
| fib. Symposium – fib International Symposium on Concrete Structures: Extend Lifetime, Limit Impacts, 2025 -- Antibes -- 337129 | 1 |
| Geotechnical Engineering for the Preservation of Monuments and Historic Sites III - Proceedings of the 3rd International Issmge TC301 Symposium, 2022 | 1 |
| Journal of Composites for Construction | 1 |
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Conference Object Citation - Scopus: 2A Critical Evaluation of Proxy Measures Used To Quantify Excavation-Induced Damage in Masonry Buildings(CRC Press, 2022) Liu, Yiyan; Gülen, Burcu; Açıkgöz, Sinan; Burd, Harvey; Gilson, Ben; İlki, Alper; Dalgıç, Korhan DenizBuilding response during nearby excavation activities (e.g., tunnelling or deep excavations) is traditionally monitored by conducting displacement measurements. These displacement data are then post-processed to determine proxy measures that are correlated to damage categories. For masonry buildings, commonly-used proxy measures include building deflection ratio, horizontal relative displacement and angular distortion; simple mechanical models and empirical rules are used to define limiting values for these proxy measures to identify and control the level of cracking in buildings during construction. This procedure has a profound influence on mitigation and construction activities, and a critical evaluation of its veracity is needed. To this end, results from a recent experimental campaign on the settlement response of half-scale masonry buildings are examined in this paper. During these tests, detailed optical measurements were conducted, allowing the calculation of absolute displacements across the façade, as well as crack opening displacements at specific locations. These measurements facilitate a direct comparison between the actual observed damage and the damage category that is indicated by the proxy measures. The comparisons highlight the limitations of existing techniques. A discussion is provided on how proxy measure calculations can be improved to deliver more reliable indications of building damage. © 2022 the Author(s).Article Citation - WoS: 3Citation - Scopus: 3Assessment of Seismic Liquefaction and Structural Instability in Adiyaman-Golbasi After the February 6, 2023, Earthquakes in Türkiye(Elsevier Sci Ltd, 2025) Ecemis, Nurhan; Dalgıç, Korhan Deniz; Donmez, Cemalettin; Karaman, Mustafa; Karaman, Mustafa; Dönmez, Cemalettin; Valizadeh, Hadi; Ecemiş, Nurhan; Dalgic, Korhan DenizTwo earthquakes, Mw = 7.8 Kahramanmaras,-Pazarcik, and Mw = 7.6 Elbistan, occurred on February 6, 2023, approximately 9 h apart. These earthquakes caused devastating effects in a total of 11 nearby cities on the east side of T & uuml;rkiye (Adana, Adiyaman, Diyarbakir, Elazig, Gaziantep, Hatay, Kahramanmaras,, Kilis, Malatya, Osmaniye, and S,anliurfa) and the north side of Syria. These earthquakes provided an outstanding prospect to observe the effects of liquefaction in silty sand and liquefaction-like behavior in clays (cyclic softening) on the stability of structures. This paper specifically presents the post-earthquake reconnaissance at three sites and evaluations of four buildings within these sites in Adiyaman Province, Golbas, i District. First, important role of post-earthquake piezocone penetration test (CPTu) in characterizing the subsurface conditions was presented. Then, the effect of soil liquefaction and cyclic softening on the performance of four buildings during the earthquakes was evaluated. These structures represent the typical new reinforced concrete buildings in T & uuml;rkiye with 3 to 6-story, situated on shallow (raft) foundations, and demonstrated diverse structural performances from full resilience to moderate and extensive damage during the aforementioned earthquakes. Based on the interim findings from these sites, the potential factors that caused moderate to severe damage to buildings were inspected, and preliminary-immediate insights were presented on the relationship between structural design, soil properties, and the performance of buildings with shallow foundations.Master Thesis Large Scale Testing of Masonry Walls Under the Effect of Representative Ground Settlements(01. Izmir Institute of Technology, 2022) Özdemir, Berkay; Dalgıç, Korhan DenizSeveral methods have been proposed so far with varying sophistications to predict ground settlement-related building damage. Limiting Tensile Strain Method (LTSM) is one of them and is frequently used in practical risk assessments. However, this method and several other methods developed based on a beam analogy might become insufficient (conservative or non-conservative) in building damage predictions due to their inherent simplicity. The accuracy of LTSM can be improved by revealing its limitations through experimental tests. However, a quite limited number of studies have been devoted so far to the investigation of soil-structure interaction caused by excavations. On the other hand, most of these studies have been performed by using small-scale building specimens. In this thesis, four large-scale structural tests have been conducted on load-bearing masonry walls. Ground displacements have been represented as support movements. Owing to realistic scale (1/2) of the walls, the effect of material properties, wall constructions, connection details and loadings could be represented in a more realistic way. The effects of floor stiffness and wall openings were examined. A comprehensive monitoring scheme could also be carried out for displacements and strains using different techniques. Based on monitored data, damage measures have been determined. Analytical predictions made through the LTSM in regard to the damage class of the walls were compared to observed damage states. Results demonstrate that the floor type has a considerable effect on the wall response and the extent of the settlement damage and damage propagation. As the number of the openings in masonry walls increases, a more distributed crack pattern is observed. Analytical predictions made through LTSM incorporated with different stiffness relations have e general agreement with actual wall damages. Nevertheless, due to use of fictitious beam approach, the accuracy of LTSM is highly affected by the structures’ floor type.Article Citation - WoS: 5Citation - Scopus: 5Estimation of Settlement-Induced Damage in Masonry Buildings From Displacement Measurements(Pergamon-elsevier Science Ltd, 2025) Liu, Yiyan; Burd, Harvey; Gulen, Derya Burcu; Dalgic, Korhan Deniz; Gilson, Ben; Ilki, Alper; Acikgoz, SinanIn current engineering practice, building damage due to nearby ground excavation activities is typically quantified by processing displacement measurements. Building displacements at discrete points are used to determine deflection measures (such as angular distortion) which are then employed to estimate building strains using elastic beam models; damage is subsequently categorised according to the limiting tensile strain criteria. The reliability of this procedure relies on the extent to which the equivalent beam models employed in the analysis provide a realistic representation of the building behaviour. However, few published investigations are available on this issue. The current paper provides an appraisal of displacement-based building damage estimation techniques by employing digital image correlation displacement data collected from a recent experimental campaign on the settlement response of three half-scale masonry buildings. The results demonstrate that the treatment of buildings with equivalent beam models does not capture building deformation kinematics, potentially leading to inaccurate estimations of damage severity and location. An alternative strain interpretation procedure, inspired by an equivalent frame idealisation of a building fa & ccedil;ade with openings, is proposed. This procedure, which uses a limited number of displacement measurements, offers a robust interpretation of strains. Its effectiveness in estimating damage is assessed through experimental data. It is demonstrated that the current limiting tensile strain criteria need to be modified to provide a reliable estimation of crack widths when using the equivalent frame idealisation.Article Citation - WoS: 9Citation - Scopus: 10Cyclic Compressive Behavior of Hybrid Frp-Confined Concrete(American Society of Civil Engineers, 2021) İspir, Medine; Dalgıç, Korhan Deniz; İlki, AlperThe aim of this study is to define the cyclic axial behavior of hybrid FRP (fiber reinforced polymer)-confined concrete based on the results of an experimental study presented here. Two different types of fiber sheets with different ultimate tensile strain capacities were used together in a suitable epoxy resin matrix to confine concrete. The inner and outer jackets of the concrete confinement were constituted with carbon (or glass) sheets with a relatively low tensile strain capacity and polyethylene terephthalate (PET) sheets with a high tensile strain capacity. PET fibers, which are a relatively new type of fiber, are made from recycled plastics. By varying the number of layers of the outer fiber sheet, different combinations were formed for the hybrid jackets. To characterize the cyclic axial behavior of hybrid FRP-confined concrete, experimental data were utilized to obtain the axial stress-strain relationship and dilation behavior. Based on the results, a stress-strain model for the envelope curve of the cyclic response of hybrid FRP-confined concrete is proposed.Conference Object Citation - Scopus: 3Large Scale Experimental Settlement Tests To Evaluate Structural Models for Tunnelling-Induced Damage Analysis(Springer, 2021) Dalgıç, Korhan Deniz; Gülen, D. Burcu; Açıkgöz, Sinan; Burd, Harvey; Hendriks, Max A.N.; Giardina, Giardina; İlki, AlperUnderground construction activities, such as tunnelling, cause local ground movements to occur. Nearby surface structures interact with the moving ground, potentially leading to building damage. Although it is understood that the severity of building damage is influenced by the façade opening ratio (OpR) and the stiffness of the floors, experimental work in this area is lacking. This paper describes the specification and design of an experimental campaign on brick masonry buildings subjected to vertical base movements. The specimens are half-scale models of walls of two-storey buildings; models with different window arrangements and with/without floor slabs are examined. To design the experimental setup, 3D finite element analyses of the model walls were conducted. Key analysis results, presented in this paper, indicate how the examined structural properties (OpR, building weight, floor stiffness) are expected to influence the patterns of damage in the masonry. The finite element results are also used to design an instrumentation system comprising Fibre Bragg Grating (FBG) sensors and a digital image correlation (DIC) system. Data from the tests will support the formulation and validation of structural models for predicting tunnelling-induced damage in masonry buildings. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.Article Citation - WoS: 8Citation - Scopus: 13Masonry Buildings Subjected To Settlements: Half-Scale Testing, Detailed Measurements, and Insights Into Behaviour(Elsevier, 2023) Dalgıç, Korhan Deniz; Gülen, Burcu; Liu, Yiyan; Açıkgöz, Sinan; Burd, Harvey; Maraşlı, Muhammed; İlki, AlperIndustry procedures to assess the risk of settlement-induced damage to masonry buildings ignore key aspects of the problem, such as the influences of building weight, façade openings, and floor structures. Experimental data are needed to characterise the influence of these aspects on damage. This paper describes tests on three brick masonry half-scale building models subjected to settlements. The use of scaling rules in choosing the model materials and kentledge, the settlement apparatus, and the cross-validation of displacement and strain measurements are presented. Comparative evaluation of building responses show that: (i) the distribution of building weight and the resulting in-situ stresses play a key role in determining compliance to settlements, (ii) openings make the structure vulnerable to cracking and (iii) floor slabs stiffen and strengthen the building and prevent the formation of damage in the upper floors, leading to a concentration of damage at the ground storey.Conference Object Citation - Scopus: 1Strengthening Historic Masonry Walls Using Sprayed Glass-Fibre Gypsum (gfrg) Against Settlement-Induced Damage(Springer Science and Business Media Deutschland GmbH, 2024) Dalgic,K.D.; Gulen,D.B.; Ozdemir,B.; Liu,Y.; Acikgoz,S.; Marasli,M.; Ilki,A.In this study, large-scale settlement tests were carried out on two test building samples consisting of masonry load-bearing walls, which are known to be sensitive to differential settlements. Test buildings were constructed in ½ scale to represent the characteristics of historical row buildings built in Istanbul in the 19th century. Test buildings consisted of two masonry walls connected to each other with reinforced concrete slabs, where additional loads were placed to explore the influence of different dead load arrangements. The walls of one of the buildings were strenghtened by spraying specially produced glass-fiber-reinforced gypsum material. The unreinforced and strengthened building models were tested under the same loads and were subjected to settlements at wall base level. The structural response of the walls (displacements and deformations) was monitored during the tests using both conventional devices (LVDTs) and optical cameras. While significant damage occurred for the unreinforced building, no damage was observed on the walls of the strengthened building. The results show that the use of glass-fiber-reinforced gypsum strengthening can provide effective protection against settlement-induced damage. It can be a good alternative strengthening material for masonry structures where the use of cement-based materials may be unsuitable. © Tongji University Press 2024.Conference Object Strengthening of Reinforced Concrete Columns Using Recycled Polyethylene Terephthalate Fibers: A Preliminary Numerical Study(fib. The International Federation for Structural Concrete, 2025) Dalgic, K.D.; Gozun, U.; Simsek, B.; Sencar, I.; Ispir, M.; Ilki, A.Strengthening of reinforced concrete (RC) columns, which have inadequate capacities of deformation and axial/lateral load, using carbon fiber reinforced polymers (CFRP) has become widespread. However, concerns about cost, energy sustainability and environmental impact have led to increased interest in alternative fibers, such as recycled polyethylene terephthalate (PET) fibers, instead of high-tech, carbon-intensive materials. This study presents preliminary numerical analyses on the use of PET fibers recycled from tire industry waste in Türkiye to strengthen substandard RC columns. The numerical analyses of the column models were performed under axial and horizontal loads. The results show that even small amounts of PET-FRP fibers can significantly improve both lateral load and deformation capacities of RC column, indicating the development of strengthening strategies for upcoming column tests. Based on the results of numerical studies, an experimental program for quasistatic testing of substandard RC columns has been planned. © 2025 Elsevier B.V., All rights reserved.Book Part Design and Construction of a Test Setup To Investigate Ground Settlement Response of Large-Scale Masonry Building Models(Springer, 2023) Liu, Yiyan; Dalgıç, Korhan Deniz; Yeşilyurt, Cennet; Gülen, Burcu; Açıkgöz, Sinan; Maraşlı, Muhammed; İlki, AlperUnderground construction activities such as tunnelling and deep excavations in urban areas may impact a significant number of surface structures and cause damage. Tunnelling-induced damage can often be repaired, but at great expense, due to significant repair costs and associated project delays. Within this context, damage caused by excavation-induced ground movements on heritage masonry buildings requires further attention, due to the cultural value and vulnerability of these assets. There is a need for experimental studies to better understand the structural response of these buildings to excavation-induced ground movements. In this study, a test setup was designed and constructed to examine the response of an experimental building model, replicating historic masonry structures, against differential settlement effects. The settlement apparatus relies on controlled jacking of large steel beams to apply differential displacements to the building. A specific tunneling scenario was considered for the design of the settlement apparatus. The constructed test setup is validated by evaluating the displacement profiles of the steel beam for different tests, with or without building. Differences between the differential settlements experienced by the steel beam and the building highlights how building weight and progressive damage may increase compliance to ground movements. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.