Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

Browse

Filters

2021 - 20234

Settings

Author: search.filters.author.İlki, AlperCOAR Access Rights: search.filters.coarAccessRights.metadata only access

Search Results

Now showing 1 - 4 of 4
  • 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, Alper
    Underground 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.
  • Article
    Citation - WoS: 10
    Citation - Scopus: 14
    Out-Of Seismic Performance of Bed-Joint Reinforced Autoclaved Aerated Concrete (aac) Infill Walls Damaged Under Cyclic In-Plane Displacement Reversals
    (Elsevier, 2023) Halıcı, Ömer Faruk; Demir, Uğur; Zabbar, Yassin; İlki, Alper
    The infill walls made of Autoclaved Aerated Concrete (AAC), which is a lightweight, fire resistant and energy efficient material, provide effective insulation solutions for building types of structures and becoming more and more popular in earthquake prone regions. Although the number of experimental tests examining the seismic response of clay brick infills is extensive, the amount of prior research on infill walls built of AAC blocks is rather limited. Past research revealed that the use of bed-joint reinforcement is one of the promising solutions to improve the global seismic response of masonry walls by enhancing strength and displacement capacity. In this study, the out-of-plane (OOP) seismic performance of AAC infill walls with flat-truss and innovative cord-type bed-joint reinforcement is experimentally evaluated. Also, consideration is given to the prior in-plane (IP) damage, which was found to degrade the seismic performance of infills in OOP direction. For this purpose, three IP and four OOP, in total, seven experimental tests were performed on four full-scale AAC infill wall specimens. The test parameters were selected in such a way as to make it possible to parametrically compare the OOP performance of AAC infills with flat-truss and cord-type bed-joint reinforcements with unreinforced AAC infill walls, together with the effect of prior IP damage on the OOP response of unreinforced AAC infill walls. It was found that the use of innovative cord-type bed-joint reinforcement improved the OOP strength to a similar extent to what was obtained from the truss-type reinforced specimen. In terms of ultimate displacement and energy dissipation capacity enhancement, the specimen with cord-type reinforcement performed better. In addition, the damages formed due to IP cyclic displacement reversals up to 0.005 drift ratio, which is defined as the drift limit for buildings with brittle infill walls in certain design codes, resulted in a significant reduction in the OOP strength and stiffness properties of AAC infills. The theoretical OOP strength calculations were found to provide unconservative strength values for the IP-damaged specimens.
  • Article
    Citation - WoS: 9
    Citation - Scopus: 10
    Cyclic Compressive Behavior of Hybrid Frp-Confined Concrete
    (American Society of Civil Engineers, 2021) İspir, Medine; Dalgıç, Korhan Deniz; İlki, Alper
    The 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: 3
    Large 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, Alper
    Underground 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.