Person: TÜRK, AHMET MURAT
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AHMET MURAT
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Publication Embargo ISO 9000 in construction: An examination of its application in Turkey(PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, 2006-04) TÜRK, AHMET MURAT; TR116137ISO 9000, the quality management system standards developed by the International Standards Organization (ISO), is widely used in the construction industry, as it is in all industries in the world. Recently, a growing interest has been paid to the use of this system in the construction industry. Despite the growing interest, ISO 9000 use of construction firms has not been sufficiently studied from the perspective of developing countries. In this article, with regard to the ISO 9000 quality management system (QMS) in Turkey, the characteristics of contractor firms in the construction industry, the perceptions, behavior and experiences of the firms in regard to ISO 9000 QMS are discussed. A field study has been executed, and a questionnaire has been carried out. In total, 138 construction firms, members of Turkish Contractors Association and representing the top-level firms operating both in Turkey and in the international market, have been selected for this study. The evaluation of the data points to the fact that the surveyed construction firms generally have a positive approach toward ISO 9000 QMS and that ISO 9000 QMS provides important advantages for the firms. However ISO 9000 QMS cannot be made widespread and applied effectively due to certain disadvantages and difficulties in practice. (C) 2005 Elsevier Ltd. All rights reserved.Publication Open Access Increasing Seismic Capacity of Existing Reinforced Concrete Buildings by the Use of FRP and Steel Fuse Elements(2010) Cömert, Mustafa; Coşgun, Cumhur; Kesti, M. Gökhan; TÜRK, AHMET MURAT; 116137; 20126; 113353Two of major problems for seismic rehabilitation of existing buildings are the necessity of evacuation of the occupants from the basis of the construction works and the limited time frame available for the actual construction site works. All of these problems often cause delays and cost overruns in the seismic rehabilitation projects. One possible way to eliminate these problems to a great extent is the use of FRP (fiber reinforced polymer) and steel fuse elements to improve seismic capacity. There is a huge stock of seismically deficient buildings that needs to be upgraded immediately according to the current Turkish Seismic Code (TSC 2007). The main aim of the paper is the examination of the possibility of using FRP and steel fuse elements on existing frame elements for seismic upgrading of the school and hospital buildings in Turkey. To investigate the possibility and effectiveness of the use of the hybrid system, a comparative study was performed. The comparison has made between typical framed RC building and the same building after retrofitting with FRP confinement and steel fuse elements around joints. By using nonlinear static (pushover) analysis, the performance levels of structural members were evaluated for both structures. This method seems as viable solution for the buildings considered in terms of safety and time.Publication Embargo Seismic Response Analysis of Masonry Minaret and Possible Strengthening by Fiber Reinforced Cementitious Matrix (FRCM) Materials(Hindawi Publishing Corporation, 410 Park Avenue, 15Th Floor, #287 Pmb, New York, Ny 10022 Usa, 2013) TÜRK, AHMET MURAT; 116137This paper presents the analytical study on the dynamic response of a natural stone block masonry minaret of a historical mosque located in Istanbul, Turkey. A three-dimensional finite element model of the whole minaret, adjusted with former in situ ambient vibration test results, was used in order to get probable lateral displacements, stresses, and understanding of failure modes under seismic loading. Particularly, FEM has been used to evaluate the seismic safety of the minaret in present-day condition and after the application of a proposed strengthening method. In this method, by utilizing the fiber reinforced cementitious matrix (FRCM) material, the critical cross-sections were jacketed. The appearing damage for the bare minaret obtained from FEM analyses was located at the boot and transition part of the minaret. After FRCM material was wrapped around these critical cross-sections, the analytical results indicated that such method appears effective in terms of the seismic response. It also appears less invasive in terms of the conservation of historical heritage like minarets without causing aesthetic conflict on the existing structure when compared to other available techniques.Publication Metadata only Case Study About Theseismic Behavior and Possible Retrofit Ofhistorical Masonry Minaret(2018) TÜRK, AHMET MURAT; 116137The paper deals with the dynamic behaviour and proposed retrofit method of a block masonry minaret, towerlike structure, of a historical mosque in Istanbul. There are large number of historical mosques and large number of minarets which were built since Ottoman Empire times. Since Turkey located in highly seismic zone, the probable damage to the masonry minarets should be determined and if necessary, safety measures should be considered. It is engineering communities' responsibility to preserve the existing cultural and built heritage by using state-of-the art science, knowledge and information. To achieve this objective, the minaret of historical mosque in Istanbul is chosen and 3D finite element model of structure prepared to obtain probable lateral displacements, crack pattern and failure modes under seismic loads. The problem becomes more complex when the dynamic analyses are also involved. However, after the developments in the dynamic testing of structures and computational methods in structural analysis, studies in this field have led some significant results about the mechanical behaviour of the old buildings. These types of studies are essential not only in protection/retrofit viewpoint but also assessment of similar ancient/historical towerlike structures. The results obtained from the numerical analysis presented have shown that the greatest damage accumulated near the base and the lower part of the minaret and FRP or FRCM material wrapped along and around these critical cross sections improves the lateral behaviour and the results are promising in terms of seismic protection of these heritages by using minimised intervention on the structure.Publication Metadata only ISO 14000 Environmental Management System In Construction: An Examination Of Its Application In Turkey(Routledge Journals, Taylor & Francis Ltd, 4 Park Square, Milton Park, Abingdon Ox14 4Rn, Oxfordshire, England, 2009) TÜRK, AHMET MURAT; TR116137In recent years, the ISO 14000 environmental management system (EMS) prepared by the International Standards Organization (ISO) has been widely used within all sectors throughout the world. There are some methods needed in order to maintain and develop environmental performance within all sectors, including the construction sector, for the protection of sustainable development and the environment worldwide. ISO 14000 EMS originated from such need. In recent years, an increased interest has also emerged in relation to the use of EMS in the construction sector. However, despite such interest, studies about applications regarding the use of the ISO 14000 EMS by construction firms have not reached the desired level. In this article, the impact of the ISO 14000 EMS on construction firms within Turkey is being reviewed by using the questionnaire survey method. A questionnaire survey study is conducted with 68 individual construction firms, which represent the top category in Turkey and operate in national and international markets as they are members of the Turkish Contractors Association (TCA). The obtained data are analysed in accordance with the objective of the study.Publication Metadata only Effect Of Depth Of Ground Water On The Seismic Response Of Frame Type Buildings On Sand Deposits. Part I: Soil Response(Springer, Po Box 17, 3300 Aa Dordrecht, Netherlands, 2009) Dikmen, S. Ümit; Kıymaz, Güven; TÜRK, AHMET MURAT; TR141170; TR116137; TR141153Earthquake codes often times classify the subsoil based on their shear wave velocities which are mostly calculated based on the situ static conditions. However, it has been shown by various researchers that saturated sands exhibit a softening behavior under cyclic conditions. As a result of this behavior the surface response may be significantly affected by the existence of ground water. In this study, the effect of depth of water table on the seismic response of sand deposits is investigated.Publication Metadata only ISO 14000 Environmental Management System and General Look on Turkish Construction Firms(2011) TÜRK, AHMET MURAT; 116137In recent years, the ISO 14000 environmental management system (EMS) has been widely used within all sectors throughout the world. There are some methods needed in order to maintain and develop the environmental performance within construction sector, for the protection of sustainable development and the environment worldwide and ISO 14000 EMS originated from such needs. Although an increased interest has emerged related to the use of the system in construction industry, the studies about the applications regarding the practice of the ISO 14000 EMS by the firms have not reached the desired level. In this study, the reasons for seeking ISO 14001 certification for the Turkish construction firms is being examined by using the questionnaire survey method. The obtained data through survey between the members of Turkish Contractors Association are analyzed in accordance with the objective of the study. According to the results of analysis, it is believed that no apparent and practical benefits exist for construction firms, initial and operating cost of certification are high and there is lack of knowledge and personnel related to ISO 14000. The high operation cost which is indicated as the most significant adversity in the implementation should be analyzed in detail by industry professionals and researchers. More studies are needed within the medium and small-scale firms. In the global construction market, an increase in the number of firms having EMS will both reduce environmental impact and develop the potential of awarding contracts to the construction firms from underdeveloped and developing countries.Publication Metadata only Performance of Aerated Autoclaved Brick Masonry Walls Strengthened by Plaster with GFRP Net and Fibers(2018) TÜRK, AHMET MURAT; 116137Recently, the autoclaved aerated concrete (AAC) has increased its popularity in construction industry where its lightness, thennal insulation properties and workability are particularly appreciated. Mainly, its lightness attracts more interest for the use of infill/partition walls of framed structures in highly seismic areas like Turkey. Such walls are usually covered by plaster for obtaining smooth surfaces for indoor areas. For better performance of plaster and increasing the cracking strength of these walls, plaster nets are utilized frequently. Plaster nets are usually made of GFRP material and keeps a potential tensile strength and deformation capacity when compared to plain plasters. To investigate the effect of the use of AAC brick walls for the new/existing structures by utilizing GFRP plaster nets and fiber added plaster is the main goal of this experimental study. The test results are discussed to investigate the effect of AAC brick wall strengthened by using inexpensive GFRP mesh and fiber on the behavior and mechanical properties of walls where wall specimens are prepared by employing different parameters like the use of GFRP mesh, use of plaster and the use of fiber wall plaster. By using diagonal tension testing method of wall specimens, the load carrying capacity comparisons are made. The results turned out to be highly promising. Significant increase in shear strength and deformation of strengthened walls in comparison with plain (reference) walls is observed. The tests also showed a positive effect of GFRP reinforcement on the failure mode of these walls.Publication Metadata only Retrofit Of The Masonry Minaret Of Historical Mosque With Frp: A Case Study(Crc Press-Taylor & Francis Group, 6000 Broken Sound Parkway Nw, Ste 300, Boca Raton, Fl 33487-2742 Usa, 2010) Coşgun, Cumhur; TÜRK, AHMET MURAT; TR116137; TR113353This paper deals with the seismic behavior and a new retrofit strategy of block masonry minaret of a historical mosque in Istanbul. Today, it is a well known fact that earthquakes are one of the most important problems that Turkey and many other countries have to deal with. There are large number of historical mosques and large number of minarets which were built since older times. Since Turkey located in highly seismic zone, the probable damage to the masonry minarets should be determined in advance and necessary precautions should be taken. The problem of seismic protection of the historical heritages have been always challenging for engineers in terms of analyzing and retrofitting of these structures due to extremely complex behavior of the material used in the construction. To achieve this objective, the minaret of historical mosque in Istanbul is chosen as a case and 3D finite element model of structure have been prepared to obtain plausible lateral displacements, probable cracking zones and failure modes under earthquake loads. The problem becomes more complex when the dynamic analyses are also involved. After the developments in the dynamic testing of structures and computational methods in structural analysis, studies in this field have led some significant results about the mechanical behavior of the old buildings. These types of studies are essential not only in protection/retrofit viewpoint but also assessment of similar historical structures. Within this outline, the dynamic behavior of old masonry minarets, which usually exhibit vulnerable behavior under seismic loading, was investigated. The results obtained from the numerical analysis have shown that the possible failure zones under seismic action can be predicted quite accurately with reasonable results, and can be used in the preservation of these minarets to guarantee their stability in case of an earthquake by reinforcing those parts which will undergo the greatest damage (usually located at the base and the lower part of the minaret). Furthermore, the analyses are performed by using fiber reinforced polymer (FRP) sheets wrapped around these critical cross sections and the results are promising in terms of seismic protection of these heritages. Preservation of cultural heritage for the future generations is indispensable for every country in the modern world. Therefore, paying enough attention to protection of historical structures is one of the most important issues in highly-seismic developing countries.Publication Metadata only Seismic Behaviour and Retrofit of Historic Masonry Minaret(2012) Coşgun, Cumhur; TÜRK, AHMET MURAT; 116137; 113353The dynamic behaviour of block masonry minaret of a historical mosque in Istanbul is analyzed, and a seismic retrofit method is proposed. Due to high seismicity of the region, a 3D finite element model is used to determine lateral displacements and failure modes under seismic load. The analyses show that the highest damage usually occurs at the base and the lower part of the minaret, and that lateral behaviour can be improved by strengthening these sections with fiber reinforced polymer (FRP) sheets. The results obtained are promising in terms of seismic protection.