Mimarlık Bölümü

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Citation - WoS: 5
Citation - Scopus: 4
Analysis of a Historic Masonry Building
(Croatian Soc Civil Engineers-hsgi, 2011) Ozmen, Cengiz; Özmen, Cengiz; Akan, Asli Er; Akan, Aslı; Unay, Ali Ihsan; 56939; 4587; Mimarlık; 05.02. Mimarlık; 05. Mimarlık Fakültesi; 01. Çankaya Üniversitesi
The paper starts from the observation that historic masonry buildings are often modified and altered to make them fit for present day use. A single-family masonry house in Turkey, situated in an earthquake prone area and built in the early 20(th) century, is studied. The analysis is made based on Turkish regulations for the initial building and for the building after alterations. Introduction of a reinforced-concrete slab has greatly improved seismic resistance of the building.
Citation - WoS: 10
Citation - Scopus: 16
Artificial Intelligence Applications in Earthquake Resistant Architectural Design: Determination of Irregular Structural Systems With Deep Learning and Imageai Method
(Gazi Univ, Fac Engineering Architecture, 2020) Bingol, Kaan; Akan, Asli Er; Ormecioglu, Hilal Tugba; Er, Arzu; 154406; 05.02. Mimarlık; 05. Mimarlık Fakültesi; 01. Çankaya Üniversitesi
Although the architectural design process is carried out with the collaboration of experts who are experienced in many different areas from the main preferences to the detailing stage, the major decisions such as plan organization, mass design etc. are taken by the architect. Computer Aided Design (CAD) programs are generally effective after the major decisions of the design are taken. For this reason, it is common for the main decisions, taken during the design process, to be changed during the analysis of the structural system. In order to prevent this, in the early stages of architectural design, earthquake system awareness and structural system design should be included as an design input; as, the failure of the structural system which did not considered well in the architectural design phase leads to unexpected revisions in the implementation project phase and thus leads to serious losses in both time and cost. The aim of this study is to create an Irregularity Control Assistant (IC Assitant) that can provide architects general information about the appropriateness of structural system decisions to earthquake regulations in the early stages of design process by using the deep learning and image processing methods. In this way, correct decisions will be made in the early stages of the design and unexpected revisions that may occur during the implementation project phase will be prevented.
Citation - WoS: 7
Citation - Scopus: 8
Post-Restoration Seismic Performance Assessment of a Historic Hypostyle Mosque in Anatolia (13th Century Ad)
(Elsevier, 2023) Cosgun, Turgay; Akan, Asli Er; Uzdil, Oguz; Er, Arzu; Ormecioglu, Hilal Tugba; Sayin, Baris; 154406; 05.02. Mimarlık; 05. Mimarlık Fakültesi; 01. Çankaya Üniversitesi
Assessment of structural performance under seismic effects is a very important step for restoration process of historic buildings that represent construction techniques and material characteristics of their era. This process consists of three stages namely, on-site examinations, restoration practices, and seismic analysis, and therefore, requires a multidisciplinary approach. Hypostyle structures are mostly timber-framed buildings with masonry walls on two or three facades. This construction method is a combination of Asia (wooden pillar) and Byzantine (masonry walls) techniques. The primary load-bearing system in these buildings is composed of multiple rows of wooden pillars. This paper presents post-restoration seismic assessment of a historic wooden hypostyle mosque complex constructed in 1273. This mosque complex is an important structure representing wooden hypostyle architecture in the Anatolia region of Turkey and is composed of three separate structures namely, a main mosque building, a minaret, and a tomb. Linear performance analysis, displacement-controlled nonlinear analysis, and kinematic limit analysis for failure mechanisms were conducted for the structures after the restoration. The linear performance analysis results indicated that the structures meet shear strength requirements for DD3 and DD2 earthquakes with recurrence periods of 72 and 475 years, respectively. Furthermore, according to the linear and non-linear analyses, the complex was found to satisfy performance limits for both ground motion levels in terms of inter-story drifts.
Citation - WoS: 16
Citation - Scopus: 13
Seismic Evaluation of a Renovated Wooden Hypostyle Structure: a Case Study on a Mosque Designed With the Combination of Asian and Byzantine Styles in the Seljuk Era (14th Century Ad)
(Elsevier, 2021) Akan, Asli Er; Basok, Gulsah Celik; Er, Arzu; Ormecioglu, Hilal Tugba; Kocak, Sevilay Zamur; Cosgun, Turgay; Sayin, Baris; 154406; 05.02. Mimarlık; 05. Mimarlık Fakültesi; 01. Çankaya Üniversitesi
Wooden hypostyle structures are primarily built using timber-framed construction types, surrounded by masonry walls on two or three facades. This construction technique is a combination of Asian (wooden frame) and Byzantine (masonry wall) techniques. The primary load-bearing system in these structures consists of multiple rows of wooden pillars. This paper focuses on the restoration of a historical wooden hypostyle mosque constructed in 1366. The mosque is a crucial example of wooden hypostyle tradition in the Anatolia region of Turkey. The study consists of four steps: field survey, lab tests, restoration practices, and seismic performance analyses for the examined structure. The on-site examination includes the visual inspection of material deterioration and the analyses of obtained samples from different places of the structure. Moreover, a building survey was carried out using three-dimensional laser scanning. Secondly, a laboratory study was performed using the samples gathered from the structure. The physical tests revealed that while the stone sample taken from the minaret had the highest porosity, the stone sample represents the west facade displayed the lowest porosity. Accordingly, the water absorption capacity of the stone sample taken from the west facade was the lowest. On the other hand, among samples, this stone sample had the highest wet and dry density. In the third step, the renovation process of the mosque considering its originality is presented. Lastly, the seismic performance level of the renovated structure is obtained using three analyses: linear, pushover, and kinematic approaches. Story drift ratios of the structure at the performance points for three earthquake ground motion levels meet the target performance requirements. Considering the realistic behavior of the material, the vulnerability of the main structure against the maximum credible earthquake is revealed in terms of tensile and shear stresses. The seismic vulnerability of the minaret is also determined in terms of both tensile and shear stresses and the story drifts ratios in both analysis types. We believe that the structural restoration processes presented in this paper to bring back a deteriorated historical mosque to its original form will provide a comprehensive approach to the literature.
Citation - WoS: 2
Structural Behaviour of 13th and 14th Century Seljuk Mosques and Acculturation of Construction Knowledge
(Univ Zagreb Fac Architecture, 2022) Akan, Asli Er; 154406; 05.02. Mimarlık; 05. Mimarlık Fakültesi; 01. Çankaya Üniversitesi
This study aims to demonstrate the acculturation of Seljuk architecture and construction techniques by tracing the development of peripheral walls in Seljuk wooden hypostyle mosques built in 13th and 14th centuries. To track the exchange of construction knowledge two Seljuk mosques (the Hanonu Mosque in Kastamonu and the Ahi Elvan Mosque in Ankara) are selected for comparison in this study. The main difference between the two mosques is their structural systems: one has a wooden peripheral wall and wooden skeleton system, while the other has a masonry peripheral wall and wooden pillars. In this study, a comparison of the structural systems and performances of these examples of wooden mosques exhibiting different wall systems was made together with structural analyses under basic loads. A series of structural analyses provides significant data about the structural behaviour of these types of structures, indicating acculturation of elements from Asia and Byzantium within Seljuk architecture and construction techniques.
Citation - WoS: 3
Citation - Scopus: 4
Towards an Earthquake-Resistant Architectural Design With the Image Classification Method
(Taylor & Francis Ltd, 2024) Akan, Asli Er; Bingol, Kaan; Ormecioglu, Hilal Tugba; Er, Arzu; Ormecioglu, Tevfik Oguz; 154406; 05.02. Mimarlık; 05. Mimarlık Fakültesi; 01. Çankaya Üniversitesi
Architectural design is an interdisciplinary process which involves multiple stages that are interconnected. In this process, it is common for major decisions to be changed during the final stage, the analysis of the structural system. After making substantial corrections, the architect has to revisit the early stages, the preliminary project. This back-and-forth process can result in significant losses in time and cost. The proposed Irregularity Control Assistant (IC-Assistant) aims to provide architects with feedback on the conformity of structural system decisions to the irregularities defined in the Turkish Building Earthquake Code (TBEC-2018), using image processing methods at the early stages of the design process. The IC-Assistant was preliminarily created to evaluate the torsional irregularity of plan organization using deep learning methods. In this study, the results of the IC-Assistant were verified by structural analysis with the Prota-Structure program. The novelty of this study is the use of the image-classification method in earthquake-resistant architectural design. Up to this point, the method has been mainly used in facial recognition systems. This method minimizes time, human error, and cost losses and includes awareness of load bearing and earthquake resistance as inputs in the early stages of architectural design.

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