İnşaat Mühendisliği Bölümü / Department of Civil Engineering
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Publication Metadata only Investigation Procedure for the Diagnosis of Historical Minarets: Inclined Minaret of Sivas Ulu Cami (Mosque)(Springer Science and Business Media Deutschland GmbH, 2024) İNCİ, PINAR; Halici, O.F.; Demir, C.; CÖMERT, MUSTAFA; Aldirmaz, B.; Coban, S.; Kiraz, F.; Kuran, F.; Berlucchi, N.; Iyisan, R.; Ilki, A. cThe inclined minaret of Sivas Ulu Cami (Mosque) from the 13th century Danishmend Period is one of the most invaluable architectural heritages in Turkey. The extent of inclination of the minaret towards the North-West direction, the seismicity of the region, and structural damages that occurred in time have emphasized the need for comprehensive structural and geotechnical investigations. Accordingly, a rehabilitation project is currently going on under the coordination of the General Directorate of Foundations of Turkey. Within the scope of the project, first, a series of field surveys have been conducted to obtain the current features of the minaret including the characteristics of the structural system, damages, deviation from the vertical axis, ground conditions and foundation details. In addition to that, a monitoring system including inclinometers, linear potentiometers and accelerometers has been mounted for tracking the evolution of deformations and damages in time under environmental influences and extracting the dynamic properties of the minaret. Findings from the field survey and monitoring system were used for constructing an analytical model of the structural system of the minaret. Then nonlinear time history analyses were conducted under various strong ground motion records to estimate the seismic performance of the minaret when subjected to earthquakes of different characteristics. The results showed that the tensile stresses that occurred due to seismic actions exceeded the tensile strength of the brick masonry at the region of the transition segment and the cylindrical body (top level of the boot). © Tongji University Press 2024.Publication Metadata only ANNs-Based Prediction Models for Consistency and Compaction Characteristics of Bentonite–Sand Mixtures(Springer Nature, 2024) Yücel, Melda; Akbay Arama, Zülal; GENÇDAL, HAZAL BERRAK; BAŞBUĞ, BEGÜM; SEÇKİN, EDİPThis study is fictionalized with the use of ANNs logic to estimate the compaction parameters of bentonite–sand mixtures. Totally 230 sets of tests were digitized from the nine well-accepted literature sources to specify the grain size, consistency, and compaction parameters of the bentonite–sand mixtures. Matlab R2018a software is used to perform the estimation process of the compaction parameters, and representative expressions were derived to ease the determination process of mixtures. Consequently, the applicability of the suggested expressions has been checked by the determination and comparison of well-known international metric measurements. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.Publication Metadata only Numerical Investigation of the Interacted Behavior of Embankment-Slope System Under Seismic Loading Conditions(Springer Nature, 2024) Akbay Arama, Zülal; Akın, Muhammed Selahaddin; Dalyan, İlknur; GENÇDAL, HAZAL BERRAKIn this study, the integrated effects of the geometrical characteristics of slope and the geotechnical strength properties of clayey foundation soils are investigated, considering the relative distance of the embankment from the slope edge under dynamic loading conditions with performing numerical analysis. In this context, a finite-element-based two-dimensional commercial software is used to perform pseudo-static analysis concerning the consideration of the Samos-İzmir earthquake in October 2020. The outcomes of the studies were evaluated in terms of the determining factor of safety values to interpret the effects of the envisaged variants on stability. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.Publication Metadata only An Overview on the Structural Monitoring, Assessment and Retrofitting of Historical Structures with a Focus on 13th Century Monuments(Springer Science and Business Media B.V., 2024) Ilki, Alper; KOÇAK, PINAR İNCİ; Halici, Omer F.; Demir, Cem; CÖMERT, MUSTAFA; Kuran, FikretMonumental historical structures affirm natural and cultural identity and hence they should be transmitted to future generations. The protection and preservation of these structures against aging and natural hazards, particularly seismic actions, requires a comprehensive approach including diagnosis of the present condition of the structure and enhancement of structural capacity for disaster mitigation, if necessary. It is obvious that due to their historical values, any attempt towards the preservation of the monumental historical structures must be carried out with respect to the principles of integrity and authenticity. In this study, the structural performance assessment procedures, implementation of structural health monitoring systems and seismic strengthening strategies are discussed and described with reference to 13th-century monumental historical structures in Turkiye. The structural engineering aspects of recent activities for the restoration and preservation of the Great Mosque and Hospital of Divrigi (a world heritage listed structure) and Sivas Ulu Cami (Mosque) Minaret are briefly presented. In light of the structural analysis and monitoring results, recommendations for interventions to these monumental structures are outlined. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.Publication Metadata only Implementation of Adaptive Modal Pushover Analyses (VMPA-A) to 20-Storey Los Angeles SAC Steel Building Subjected to Bi-directional Ground Motions(Springer Science and Business Media Deutschland GmbH, 2024) Sürmeli, Melih; Yüksel, Ercan; OSMAK, ÖZGEIn this study, an adaptive modal pushover analysis procedure (VMPA-A) is implemented in the 20-story Los Angeles SAC Steel building. The method considers the changes in the dynamic characteristics and bi-directional ground motion effects simultaneously with the help of the hybrid-spectrum concept. Two different approaches are used to calculate displacement demands for each mode. The first one is equal displacement rule and the second is performing nonlinear time history analyses (NTHA) to modal single degree of freedom systems (SDOF). VMPA-A procedure is implemented by using a MATLAB-based computer program, DOC3D. The building is modeled with both SAP2000 and DOC3D programs. Cross-checks are done between two programs by performing eigenvalue and pushover analyses. As an accepted “exact solution”, NTHAs are used to check the accuracy of the VMPA-A procedure. Fourteen ground motion records, which were selected from the PEER NGA-West2 Database, are used in NTHAs by using SAP2000. The response parameters of storey shears, storey displacements, storey drifts, and column and beam curvatures are discussed by comparing the results of VMPA-A with nonlinear time history analyses. Good estimates are observed for storey displacements, storey shears, and storey drifts. Although the second approach in the calculation of displacement demands gives closer results to NTHA, the obtained demand parameters from the equal displacement rule are conservative. Storey drift and beam curvature distributions seem to be in a similar trend. Larger values for lower stories and smaller values for the upper stories are obtained with respect to the average of NTHAs. However, beam curvature distribution can not be predicted by VMPA-A, especially for the upper stories of the building. The column curvature results are in good agreement with NTHA results. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.Publication Open Access Life Cycle Assessment Analysis Based on Material Selection in Sustainable Airport Buildings(MDPI, 2024) UĞURAL, MEHMET NURETTİN; ÖZYILMAZ, MERVE RÜYA; Burgan, Halil IbrahimSustainable airport buildings aim to minimize environmental impacts through energy efficiency, water conservation, and waste management. This is achieved by employing green building materials and utilizing renewable energy sources to reduce their carbon footprint. In this study, life cycle assessment (LCA) was conducted to assess the environmental impacts of three main construction materials—concrete, steel, and wood—used in sustainable airport buildings. These materials were selected for their widespread use in eight different airport terminal buildings with sustainability certifications. The environmental impacts of these materials were calculated and compared using OpenLCA 1.9.0 software and the ECOinvent database, adhering to the standards set forth by the Environmental Product Declaration (EPD) initiative. The findings indicate that wood, as a construction material, has a significantly lower impact on global warming compared to steel and concrete, with a global warming potential (GWP) ratio of less than 60%. Steel, with a GWP of approximately 90% of that of concrete, also showed a lower impact than concrete. Additionally, other environmental impacts, such as stratospheric ozone depletion potential (ODP) and acidification potential (AP), were also examined, highlighting the trade-offs associated with each material. © 2024 by the authors.Publication Open Access Ordular ve Dijital Dönüşüm: Sorunlar ve Çözümler(Millî Savunma Üniversitesi Atatürk Stratejik Araştırmalar ve Lisansüstü Eğitim Enstitüsü, 2024) Sağbaş, Murat; Erdoğan, Fahri Alp; UĞURAL, MEHMET NURETTİN; Kara, Arzu UğurluDeğişen koşullar kaçınılmaz olarak askerî yapıları ve sistemleri etkilemektedir. Tarih boyunca askerî yapılar doktrinel, organizasyonel, stratejik ve teknolojik gelişmeler nedeniyle sürekli olarak değişikliklere uğramıştır. Bu araştırmanın amacı, orduların dijital dönüşüm sürecinde yaşadıkları sorunların tespiti ve bu sorunlara yönelik olası çözüm önerilerini tartışmaktır. Araştırma yöntemi olarak sistematik literatür taraması ile uzman görüşmesine başvurularak hibrit bir yöntem kullanılmıştır. Araştırmanın özgün değeri, orduların dijital dönüşüm sürecinde karşılaştığı pratik ve güncel sorunları ele alması ve bu sorunlara somut, gerçekçi ve uygulanabilir çözüm önerileri sunmasıdır. Araştırmanın sonucunda eski sistemlerin yeni teknolojilere uyum sağlamada sorun yaşadığı, dijital dönüşümün siber güvenlik açıkları oluşturduğu, veri yönetiminde altyapı eksikliği görüldüğü, eğitim ve öğretim alanlarında 10 yıl ve üzeri personelin değişime karşı direnç gösterebileceği tespit edilmiştir. Bu bulguların, silahlı kuvvetlerdeki uygulayıcılara ve karar vericilere, dijital dönüşüm süreci içerisinde teknolojilerdeki değişimler yoluyla orduların örgütsel yapılarındaki dönüşümler, personel istihdamı, yeni beceri ve kapasite gereksinimleri, askerî eğitim sistemleri ve karar alma süreçleri gibi durumlarda öngörülerde bulunmalarına yardımcı olacağı değerlendirilmektedir.Publication Open Access Şantiye Mühendislerinin Karar Verme Davranışlarının İncelenmesi(Manisa Celal Bayar Üniversitesi, İktisadi ve İdari Bilimler Fakültesi, 2024) ÇELİK, FATİH; UĞURAL, MEHMET NURETTİNBu çalışmada, inşaat sektöründe karar verici pozisyonunda görev almakta olan şantiye mühendislerinin karar verme durumları araştırılmıştır. Şantiye mühendislerinin karar verme davranışlarını, anlamak ve doğal karar verme süreçlerinin karar verme stilleri (KVS) ile ilişkisini açıklamayarak, karşılaşmış oldukları problemlere karşı karar verme davranışlarının iyileştirilmesine katkı sağlanması amaçlanmıştır. Çalışmanın örneklem grubunu, Türkiye’deki özel firmaların şantiyelerinde çalışan 150 inşaat mühendisi oluşturmaktadır. Veri toplama aracı olarak oluşturulan 34 maddelik anket formunda, 4 adet demografik soru, 5'li likert tipi sorulardan oluşan 6 maddelik Doğal Karar Verme (DKV) ölçeği ve 24 maddelik Karar Verme Stilleri (KVS) ölçeği kullanılmıştır. Katılımcılardan toplanan veriler, ‘’SPSS 26 versiyonu’’ ve ‘’AMOS 23 versiyonu’’ programları ile analiz edilmiştir. Elde edilen bulgularda; kaçıngan karar verme stilinin rasyonel karar verme stili ile negatif, diğer karar verme stilleri ve doğrusal karar verme ile de pozitif anlamlı bir ilişkisi olduğu görülmüştür. Analiz sonuçlarına göre şantiyede görev yapan inşaat mühendislerinin, en çok kaçıngan karar verme stilini ve kendiliğinden karar verme stilini benimsedikleri ortaya çıkmıştır. Bu durumda şantiyede çalışan inşaat mühendislerinin rasyonel süreçler yerine doğal karar verme davranışı ile pozitif anlamlı ilişkisi olan, sezgisel, kaçıngan ve kendiliğinden karar verme stilini uyguladıkları sonucuna ulaşılmıştır.Publication Open Access Rising Damp Treatment in Historical Buildings by Electro-Osmosis: A Case Study(MDPI, 2024) Koca, Aliihsan; UĞURAL, MEHMET NURETTİN; YAMAN, ERGÜNThroughout the past century, numerous technologies have been suggested to deal with the capillary rise of water through the soil in historic masonry buildings. The aim of this study was to examine the effectiveness of capillary moisture repulsion apparatus that uses the electro-osmosis approach over a prolonged period of time. The G & uuml;l mosque was selected as a sample historical building affected by structural problems caused by the absorption of water through small channels on its walls due to capillary action. The moisture repulsion mechanism efficiently decreased the moisture level in the walls from a 'wet' state to a 'dry' state in roughly 9 months. After the installation of the equipment, the water mass ratio of the building decreased from 14.48% to 2.90%. It was determined that the majority of the water in the building was relocated during the initial measurement period. Furthermore, it inhibited the absorption of water by capillary action by protecting the construction elements that were in contact with the wet ground. Lastly, capillary water repulsion coefficients (C) for various measurement durations and time factors were proposed. The average value of C was calculated to be 0.152 kg/m2 s0.5 by measuring the point at which the water repulsion remained nearly constant.Publication Restricted Thermomechanical Behavior of Polyurethane Nanocomposite Foams Containing Organoclay Particles Modified With Bio-Based Fatty Acid(Elsevier, 2024) Önder, Emel; SARIER, NİHALIn this study, rigid polyurethane (PU) foams containing 1.0–2.0 wt% organoclay (OC), PU-OC, modified from nanoclay (NC) using octadecanoic acid, a bio-based chemically stable low-cost fatty acid, were synthesized and investigated for their structural, thermal and thermo-mechanical properties in comparison with pure PU and PU-NC foams. PU-OC foams provided good structural integrity and host-guest morphology. Thermogravimetric analyses revealed that the one with 2.0 wt% OC showed improved thermal stability with a significant delay in the decomposition temperatures, with maximum loss rates at 345°C and 408°C, respectively, which were at least 26 K and 8 K higher than their counterparts. PU-OC foams developed more elastic responses in dynamic mechanical tests from -80°C to +155°C and from -60°C to +60°C under cyclic compression of 0.1 N, as well as under linear deformation of 1.0–9.5N at 25°C, indicating that PU-organoclay foams are promising for use in severe environmental conditions.Publication Metadata only Sodyum Sülfat Çözeltisinin Buğday Sapı Külü Katkılı ve Katkısız Harçlara Etkileri(Çimento ve Beton Dünyası, 2000) BİRİCİK, HASAN; Aköz, FevziyePuzolanik özelliği deneysel olarak belirlenen buğday sapı külünün, harçların sülfata karşı dayanıklılığım araştırmak için, S02−4 konsantrasyonu 10000 mg/L ve 40000 mg/L olan sodyum sülfat çözeltileri kullanılmıştır. Deneyler standard harçlarda ve çimento ağırlığının, %8, %16 ve %24 oranlarında ikameli olarak buğday sapı külü katılmış harçlarda yapılmıştır. Numuneler 28 gün kirece doygun suda saklanmış ve 28. gün, eskitme süreci için başlangıç kabul edilmiştir. Başlangıçta, 28., 56., 90. ve 180. günlerde numunelerde eğilme dayanımı, basınç dayanımı ve birim ağırlık belirlenmiştir. Çözeltiler 14 gün ara ile yenilenmiş, o günlerde ağırlıklar ölçülmüştür. Sodyum sülfat çözeltile-rinin harç özelliklerine etkileri kül oranına göre değerlendirilmiştir. Çimentoya kül katılması, 180. güne kadar yüksek konsantrasyonda bile harcın sülfata karşı dayanıklılığına olumlu etki yapmıştır.Publication Open Access Characterization of Site Amplification by a Parametric Study(Taylor & Francis Inc., 2023) FERCAN, NAZİFE ÖZGE; Şafak, Erdal; Ansal, AtillaThe reliability of Vs30 and the performance of alternative time averaged shear wave velocities (Vsz) and shear wave travel times (Ttz) at various depths, z, were investigated for the estimation of site amplification and fundamental frequency (f0) characterization by considering the linear and nonlinear soil behavior. The study revealed that alternative parameters performed better than Vs30 and the best performing z parameters changed by switching from convex to concave theoretical profiles and by increasing ground motions. For a practical usage in site investigations, guidelines to estimate nonlinear soil amplification factor and fundamental frequency from the linear ones were presented.Publication Open Access A Study of the Relationship between Safety Perceptions and Mindfulness(ADAMOR Toplum Araştırmaları Merkezi, 2023) UĞURAL, MEHMET NURETTİNIt is well known that the construction industry has a high rate of workplace accidents, resulting in complex legal situations and legal cases. Researchers are debating whether the majority of workplace accidents and injuries are the result of employees' unsafe work practices or unsafe working conditions. In this context, it has been determined that we must comprehend the trait predictors of safety behaviors, which influence workplace accidents and injuries. This study's primary objective is to identify the factors that influence safety behavior in construction workplaces. In previous studies, the effects of employee perceptions of safety culture on safety behavior performance were typically measured with the aid of various mediators. This study, unlike previous ones, focuses on revealing the mediating effect of employee mindfulness perceptions in the relationship between safety culture and safety behavior. Using a sample of 387 employees from the Turkish construction industry, a 58-item survey was conducted to determine the impact of safety culture perception and mindfulness on self-reported safety behavior. A structural equation model was used to analyze and explain the relationships between the proposed framework's constructs. The results of the study indicate that safety culture is associated with safety behavior, and that mindfulness mediates this relationship. There are significant relationships between employees' perceptions of safety culture, mindfulness, and safety behavior, according to the findings. Safety culture and mindfulness are significant predictors of safety behaviors, and mindfulness is an essential personal resource for a successful safety-focused organization.Publication Open Access Risk Assessment for International Construction Projects(Niyazi Özdemir, 2023) UĞURAL, MEHMET NURETTİNInternational projects are inherently exposed to unforeseeable and complex risk scenarios. This study aimed to assess and identify the critical risk factors in international contracting projects, based on the analytic hierarchy process (AHP) method. The most compelling risks that are faced by the construction firms in the Afghanistan market are determined primarily by meta-analysis. According to the data obtained from this analysis, the priorities of the risks and the degree of severity between each other are determined by using the AHP method. This research enhances the current body of knowledge about the possible encountered threats for investing the high-risk construction markets. The findings of the study may also help contractors to develop strategies "to bid or no-bid decisions" for high-risk markets.Publication Restricted Structural Characteristics of the Earthquake-Prone Building Stock in Istanbul and Prioritization of Existing Buildings in Terms of Seismic Risk-A Pilot Project Conducted in Istanbul(Taylor and Francis Ltd., 2023) Aydoğdu, Hasan Hüseyin; Demir, Cem; CÖMERT, MUSTAFA; Kahraman, Tayfun; Ilki, AlperEarthquakes have caused catastrophic results in cities since the beginning of settled life, and the cumulative experience of these events has indicated that the lack of seismic resilience brings enormous economic losses and threatens human life. Consequently, the importance of seismic risk mitigation of earthquake-prone structures has arisen to reduce the primary and secondary losses resulting from seismic events in the last decades as developments in the earthquake engineering field occur. The first step for ensuring seismic resilience is the identification of risky buildings, which is a difficult challenge for metropolises like Istanbul since the building stock consists of over a million buildings. Applying code-based detailed assessments to so many buildings is not practical in terms of time and cost. Moreover, the current code-based detailed assessment methodologies such as Provisions for the Seismic Risk Evaluation of Existing Buildings under Urban Renewal Law (2019) and Turkish Building Earthquake Code (2018) provide discrete predictions for existing buildings as either risky or non-risky or satisfying life safety/controlled damage or not. However, a ranking system based on a reliable and realistic risk classification to prioritize the buildings is needed. Therefore, as a pilot project, nearly 23,000 reinforced concrete buildings in 37 different districts of Istanbul have been investigated by Istanbul Metropolitan Municipality (IMM) through PERA2019 performance-based rapid assessment methodology by considering the Design Level and Scenario-Based Earthquake cases. This is the most up-to-date and comprehensive site survey and analysis conducted in Istanbul up to now. In this paper, the characteristics of the building stock in Istanbul based on the conducted site work and the outcomes of the rapid seismic safety assessment efforts are summarized. Then, a discussion on the seismic risk evaluation of the existing residential buildings based on the prioritization of the examined buildings is presented through the results obtained for the Design Level and Scenario-Based Earthquake cases.Publication Restricted Seismic Retrofit of Substandard RC Columns Using Sprayed Glass Fiber-Reinforced Mortar and Basalt Textile Reinforcement(Taylor & Francis Ltd., 2023) Ateş, Ali Osman; Hajihosseinlou, Saeid; Nasrinpour, Amin; Demir, Cem; CÖMERT, MUSTAFA; Maraşlı, Muhammed; İlki, AlperThis study investigates the seismic retrofit of substandard reinforced concrete (RC) columns through external jacketing of potential plastic hinge zones using sprayed glass fiber-reinforced mortar and basalt textile reinforcement. An innovative spraying method was used to apply the matrix material to the concrete surface. A total number of eight full-scale columns (four reference, four retrofitted) were tested under constant high axial load to capacity ratio and reversed cyclic lateral loading. Columns were constructed using low-strength concrete and transverse reinforcement with various spacing and inadequate hook detailing to mimic the columns in substandard structures. Test results are evaluated in terms of lateral load-drift ratio relationships, displacement ductility, stiffness degradation, energy dissipation, and residual displacements. Evaluation of the test results showed that the proposed technique is effective for seismic retrofit of substandard RC columns, particularly in terms of enhancement of displacement ductility, energy dissipation capacities, and reduction of residual displacements.Publication Open Access Material Selection with Value Engineering Technique - A Case Study in Construction Industry(University of Osijek, 2023) UĞURAL, MEHMET NURETTİNAs a result of the rising level of competition in the construction industry, businesses strive to stay one step ahead of their rivals and overcome the most fundamental optimization challenge of balancing quality, time, and cost parameters. This is not always possible, however. Occasionally, the project may be completed late, the budget may be exceeded, or the desired quality cannot be attained. Various strategies have been developed to address these issues. The value engineering method is among these techniques. Taking into account quality, time, and cost, value engineering executes cost-saving projects without disregarding customer expectations. Value engineering seeks to increase value by concentrating on functions other than cost management. By conducting value studies on the products, value engineering can introduce new designs, develop the existing product, or provide value to the customer. This study employed value engineering to determine the thermal insulation material to be used in a building. First, the functions to be worked on were determined by considering user expectations, and then three alternative products that provide these functions were identified among the most preferred products. By developing alternative products, the advantages and disadvantages of the original products were revealed. The most valuable product was determined by calculating the product's value in relation to its benefits and costs. Thus, the optimal product was selected by weighing the user's expectations, the product's benefits, and its price.Publication Open Access Bulanık CPM ile Doğrusal Programlama: İnşaat Endüstrisinde Bir Vaka Çalışması(Süleyman Demirel Üniversitesi Mühendislik Fakültesi, 2022) Değirmenci, Güllü; UĞURAL, MEHMET NURETTİNİnşaat sektöründe karmaşık projelerin planlanması ve kontrolü için Kritik Yol Metodunun (KYM), yaygın olarak kullanılan yararlı bir araç olduğu kanıtlanmıştır. Ancak, faaliyetlerin süresi net sayılarla temsil edildiğinden, kritik yol analizinde faaliyet sürelerini kesin olarak tahmin etmek zorlaşır. Buna ek olarak, vakaların çoğu, görev sürelerinin sübjektif olarak hesaplanmasını gerektirir ve bu da faaliyetlerin süresi hakkında belirsizliğe neden olur. Bu makale, bulanık kümelere dayalı bir yaklaşım önererek bu sorunları ele almaktadır. Bu çalışmanın amacı, bir inşaat projesinin kritik yolunu ve tamamlanma süresini hesaplamak için bulanık sayıların nasıl kullanılacağını göstermektir. Çalışma kapsamında proje faaliyetlerine üçgen bulanık süreler verilerek iki ayrı çözüm algoritması oluşturulmuştur. Örnek bir inşaat projesinin kritik yolu ve proje süresi ilk çözüm algoritmasında proje faaliyetlerine üçgen bulanık süreler atanarak ve doğrusal programlama modeli kullanılarak hesaplanırken, ikinci çözüm algoritmasında bulanık proje süresi ve kritik yol Alfa kesme yöntemi (α -Kesme Yöntemi) kullanılarak hesaplanmış ve daha sonra Centroid yöntemi (Alanların Merkezi Yöntemi) kullanılarak netleştirilmiştir. Bu proje için kritik yol ve tamamlanma süresi önceden bilindiğinden, iki çözüm algoritması karşılaştırılmıştır. Kritik yol yöntemi yerine Bulanık kritik yol yönteminin kullanılmasının bu çalışmanın önemini vurgulayacağı umulmaktadır.Publication Restricted Seismic Retrofitting Of the 19(TH) Century Hirka-i Serif Mosque Using Textile Reinforced Mortar(Taylor & Francis Inc., 2022) Demir, C.; CÖMERT, MUSTAFA; KOÇAK, PINAR İNCİ; Dusak, S.; İlki, A.In this study, a novel retrofitting intervention on the Hirka-i Serif Mosque (constructed in 1851), which has a significant importance for Muslims due to its historical relic preservation unit keeping the cloak of the Prophet Muhammad, was illustrated. For this purpose, first the seismic performance of the mosque was investigated through site investigations and structural analyses. A 3D finite element model of the Mosque was established, and the structural system was analyzed under the combined effects of the vertical loads and seismic actions. Additionally, the existing damages observed on the walls and vaults were investigated thoroughly. By taking the existing damages and the analyses results into consideration, a rehabilitation and seismic retrofit scheme was proposed and applied by making use of innovative materials. Throughout the study, recommendations of the guideline for earthquake risk management of historical structures in Turkey (2017) has been considered.Publication Open Access Gömülü Betonarme Boruların Analitik ve Sayısal Yöntemler ile Tasarımı(Turkish Chamber Civil Engineers, 2022) Demirci, Onur; Kılıç, Havvanur; YAZICI, GÖKHANGömülü betonarme borular, kentsel altyapının kritik bileşenleridir. Tasarımlarında, boru özellikleri, boruyu çevreleyen dolgu zemin, yataklama koşulları ve etki eden dış yükler dikkate alınarak ampirik veya sayısal yöntemler kullanılır. Bu çalışmada, uygulamada yaygın olarak kabul gören ampirik ve sayısal analiz yöntemleri dikkate alınarak yapılan tasarım hesaplarındaki farklılıklar geri dolgu malzeme türü, dolgu yüksekliği ve boru çapı değişimi dikkate alınarak parametrik analizler ile incelenmiştir. Çalışma sonuçları, sayısal analizlerde zemin-boru etkileşiminin gerçekçi olarak dikkate alınması nedeniyle hesaplanan gerekli donatı alanlarının geleneksel tasarım yöntemlerinden elde edilen değerlere göre daha düşük olduğunu göstermektedir.