Akifer parametrelerin belirlenmesi yeralti suyu muhendisliginde dikkate alinan onemli bir problemdir. Pratikte bu parametreler tip egri cakistirma yaklasimlari kullanilarak belirlenmektedir. Ancak bu yaklasimlarin dogrulugu genellikle modelleme yapan kisinin becerisine bagli olmaktadir. Bu problemin ustesinden gelebilmek icin bu calisma kapsaminda optimizasyon tabanli bir egri cakistirma yaklasimi onerilmistir. Onerilen yaklasimda dogrusal olmayan indirgenmis gradyan yaklasimi (GRG) kullanilarak zaman-dusu ve tip egriler otomatik bir sekilde cakistirilacak sekilde akifer parametreleri belirlenmektedir. Gelistirilen yaklasimin performansi basincli ve sizintili akifer sistemlerine ait iki ornek cozulerek degerlendirilmistir. Elde edilen sonuclar onerilen yaklasimin akifer parametrelerini etkin bir sekilde belirleyebildigini gostermistir.
{"title":"Akifer Parametrelerinin Optimizasyon Tabanlı Bir Eğri Çakıştırma Yaklaşımı Kullanılarak Belirlenmesi","authors":"M. Ayvaz, Gurhan Gurarslan","doi":"10.18400/tekderg.536342","DOIUrl":"https://doi.org/10.18400/tekderg.536342","url":null,"abstract":"Akifer parametrelerin belirlenmesi yeralti suyu muhendisliginde dikkate alinan onemli bir problemdir. Pratikte bu parametreler tip egri cakistirma yaklasimlari kullanilarak belirlenmektedir. Ancak bu yaklasimlarin dogrulugu genellikle modelleme yapan kisinin becerisine bagli olmaktadir. Bu problemin ustesinden gelebilmek icin bu calisma kapsaminda optimizasyon tabanli bir egri cakistirma yaklasimi onerilmistir. Onerilen yaklasimda dogrusal olmayan indirgenmis gradyan yaklasimi (GRG) kullanilarak zaman-dusu ve tip egriler otomatik bir sekilde cakistirilacak sekilde akifer parametreleri belirlenmektedir. Gelistirilen yaklasimin performansi basincli ve sizintili akifer sistemlerine ait iki ornek cozulerek degerlendirilmistir. Elde edilen sonuclar onerilen yaklasimin akifer parametrelerini etkin bir sekilde belirleyebildigini gostermistir.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47227966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Turkiye’nin Karayollari Genel Mudurlugu bunyesindeki ilk beton yol uygulamasi olan Afyon-Emirdag kesimi derzli donatisiz beton kaplama olarak Belcika Katalog yontemine gore tasarlanmistir. Bu tasarim, hem geleneksel Amerikan Devlet Karayolu ve Tasimacilik Idareleri Birligi ampirik tasarim yontemi (AASHTO 93); hem de mekanistik-ampirik (M-E) ustyapi tasarim yontemi ile yeniden analiz edilerek, mevcut yol uzerinden araliklarla olculen duzgunsuzluk (IRI) degerleri ile karsilastirilmistir. Saha olcumleri ile M-E analizleri sonucu tahmin edilen IRI degerlerinin birbirine oldukca yakin oldugu tespit edilmistir. M-E analizleri sonucunda mevcut yolun servis surecinde duzgunsuzluk ve faylanma performans kriterlerine gore sinir degerleri asacagi, ancak enine catlak yonunden sinir degerler icinde kalacagi ongorulmustur.
{"title":"Mekanistik-Ampirik ve Geleneksel Beton Yol Tasarım Yöntemlerinin Karşılaştırılması: Afyon-Emirdağ Deneme Kesimi","authors":"Emin Şengün, Hande Isik Ozturk, İ. Yaman","doi":"10.18400/tekderg.565709","DOIUrl":"https://doi.org/10.18400/tekderg.565709","url":null,"abstract":"Turkiye’nin Karayollari Genel Mudurlugu bunyesindeki ilk beton yol uygulamasi olan Afyon-Emirdag kesimi derzli donatisiz beton kaplama olarak Belcika Katalog yontemine gore tasarlanmistir. Bu tasarim, hem geleneksel Amerikan Devlet Karayolu ve Tasimacilik Idareleri Birligi ampirik tasarim yontemi (AASHTO 93); hem de mekanistik-ampirik (M-E) ustyapi tasarim yontemi ile yeniden analiz edilerek, mevcut yol uzerinden araliklarla olculen duzgunsuzluk (IRI) degerleri ile karsilastirilmistir. Saha olcumleri ile M-E analizleri sonucu tahmin edilen IRI degerlerinin birbirine oldukca yakin oldugu tespit edilmistir. M-E analizleri sonucunda mevcut yolun servis surecinde duzgunsuzluk ve faylanma performans kriterlerine gore sinir degerleri asacagi, ancak enine catlak yonunden sinir degerler icinde kalacagi ongorulmustur.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48046831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Prefabrikasyon, insaat sektorunde sanayilesmenin baslangici olarak kabul edilir ve bu surecleri makinelesme, otomatik kontrol ve uretim takip etmektedir. Prefabrik insaat teknolojisi, binalarin daha kolay ve hizli, daha dusuk maliyet, daha basarili kalite kontrol ve daha az malzeme israfi ile yapilmasina da olanak tanimaktadir. Prefabrike sistemlerin bircok avantaji olmasina ragmen, Turkiye’de prefabrike yapi sistemlerin kullanimi cok dusuk seviyelerdedir. Bu arastirmanin amaci, Turkiye'de prefabrik yapi sistemlerinin kullanimini etkileyen kriterleri tespit etmektir. Bu amacla mimarlara, prefabrik eleman uretimi yapan firmalara ve yuklenici firmalardan anket yontemiyle veri toplanmis; toplanan veriler “SPSS 22” kullanilarak analiz edilmistir. Calismanin sonucunda her uc katilimci grubu icin tasarim, uretim ve yapim sureclerini etkileyen kriterlerin farkli oldugu ve katilimci gruplarin onem gosterdikleri kriterlerin de her bir surecte degiskenlik gosterdigi sonucuna ulasilmistir.
{"title":"Prefabrike Yapıların Tasarım, Üretim, Depolama, Nakliye Ve Yapım Süreçlerini Etkileyen Kriterler","authors":"İlhami Ay, Gülden Gümüşburun Ayalp","doi":"10.18400/tekderg.647272","DOIUrl":"https://doi.org/10.18400/tekderg.647272","url":null,"abstract":"Prefabrikasyon, insaat sektorunde sanayilesmenin baslangici olarak kabul edilir ve bu surecleri makinelesme, otomatik kontrol ve uretim takip etmektedir. Prefabrik insaat teknolojisi, binalarin daha kolay ve hizli, daha dusuk maliyet, daha basarili kalite kontrol ve daha az malzeme israfi ile yapilmasina da olanak tanimaktadir. Prefabrike sistemlerin bircok avantaji olmasina ragmen, Turkiye’de prefabrike yapi sistemlerin kullanimi cok dusuk seviyelerdedir. Bu arastirmanin amaci, Turkiye'de prefabrik yapi sistemlerinin kullanimini etkileyen kriterleri tespit etmektir. Bu amacla mimarlara, prefabrik eleman uretimi yapan firmalara ve yuklenici firmalardan anket yontemiyle veri toplanmis; toplanan veriler “SPSS 22” kullanilarak analiz edilmistir. Calismanin sonucunda her uc katilimci grubu icin tasarim, uretim ve yapim sureclerini etkileyen kriterlerin farkli oldugu ve katilimci gruplarin onem gosterdikleri kriterlerin de her bir surecte degiskenlik gosterdigi sonucuna ulasilmistir.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43211603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Within the confines of this study, the results of direct shear box tests performed on poorly-(GP) and well-graded (GW) gravel samples are presented. Samples are tested under effective normal stresses ranging from 77 to 205 kPa, and with initial void ratio ranging from 0.42 to 0.53. The estimated peak secant-angles of shearing resistances vary in the range of 49 to 61 degrees. On the basis of the ratio of vertical to horizontal deformation rates, the peak angles of dilation are estimated as 10-16 degrees. These estimated values are concluded to be in coherency with available literature, other than the recommendations of Navfac DM 7.01.
{"title":"Large Scale Direct Shear Box Tests on Gravels","authors":"A. A. Yunatci, K. Cetin","doi":"10.18400/tekderg.606816","DOIUrl":"https://doi.org/10.18400/tekderg.606816","url":null,"abstract":"Within the confines of this study, the results of direct shear box tests performed on poorly-(GP) and well-graded (GW) gravel samples are presented. Samples are tested under effective normal stresses ranging from 77 to 205 kPa, and with initial void ratio ranging from 0.42 to 0.53. The estimated peak secant-angles of shearing resistances vary in the range of 49 to 61 degrees. On the basis of the ratio of vertical to horizontal deformation rates, the peak angles of dilation are estimated as 10-16 degrees. These estimated values are concluded to be in coherency with available literature, other than the recommendations of Navfac DM 7.01.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44645679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A settlement analysis has been carried out for several sectors of a rail station yard improved with prefabricated vertical drains (PVD) in Istanbul, that exhibited prolonged consolidation beyond the predicted values in certain sectors of the treated zone. Final settlement and End of Primary (EOP) settlement times have been estimated theoretically as well as using the Asaoka graphical procedure. The compliance of settlement-time curves with in-situ measurements and Asaoka solution has been investigated. A geotechnical model was developed for finite element and three-dimensional consolidation analyses. The settlement curves obtained by varying horizontal-vertical permeability coefficient ratio ( k h / k v ) and insitu measurements have been compared, and k h / k v values corresponding to 90% degree of consolidation has been computed for all sectors. The effect of drain spacing ( s drain ) as well as drain length ( L drain ) on the rate of consolidation have been evaluated for each sector, keeping the specified ratios constant. The times corresponding to 95% degree of consolidation ( t 95 ) have been calculated using the theoretical solution and compared to in-situ measurements. Calculated t 95 ’s has also been compared to their estimated values by varying the spacing ( s drain ) and the length (L drain ). Additionally, the required intervals of s drain and L drain have been obtained corresponding to the calculated t 95 times. The analyses suggest that the main reason for prolonged consolidation was the horizontal to vertical permeability coefficient ratio. According to the analysis results, PVD implementation was not efficient in clays having k h / k v of approximately unity. The main conclusion of this study was to discover the necessity for optimizing the variables in any such project. The efficacy of the works can be significantly enhanced if simultaneous evaluation of the parameters s drain and L drain and the permeability ratio k h / k v is carried out prior to field work. Otherwise, “accidents” may emerge as found out in this project.
{"title":"Analysis of a Prefabricated Vertical Drain (PVD) Soil Improvement Project","authors":"A. Mert, Akın Önalp, E. Arel","doi":"10.18400/tekderg.641218","DOIUrl":"https://doi.org/10.18400/tekderg.641218","url":null,"abstract":"A settlement analysis has been carried out for several sectors of a rail station yard improved with prefabricated vertical drains (PVD) in Istanbul, that exhibited prolonged consolidation beyond the predicted values in certain sectors of the treated zone. Final settlement and End of Primary (EOP) settlement times have been estimated theoretically as well as using the Asaoka graphical procedure. The compliance of settlement-time curves with in-situ measurements and Asaoka solution has been investigated. A geotechnical model was developed for finite element and three-dimensional consolidation analyses. The settlement curves obtained by varying horizontal-vertical permeability coefficient ratio ( k h / k v ) and insitu measurements have been compared, and k h / k v values corresponding to 90% degree of consolidation has been computed for all sectors. The effect of drain spacing ( s drain ) as well as drain length ( L drain ) on the rate of consolidation have been evaluated for each sector, keeping the specified ratios constant. The times corresponding to 95% degree of consolidation ( t 95 ) have been calculated using the theoretical solution and compared to in-situ measurements. Calculated t 95 ’s has also been compared to their estimated values by varying the spacing ( s drain ) and the length (L drain ). Additionally, the required intervals of s drain and L drain have been obtained corresponding to the calculated t 95 times. The analyses suggest that the main reason for prolonged consolidation was the horizontal to vertical permeability coefficient ratio. According to the analysis results, PVD implementation was not efficient in clays having k h / k v of approximately unity. The main conclusion of this study was to discover the necessity for optimizing the variables in any such project. The efficacy of the works can be significantly enhanced if simultaneous evaluation of the parameters s drain and L drain and the permeability ratio k h / k v is carried out prior to field work. Otherwise, “accidents” may emerge as found out in this project.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46024339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nihat Kabay, Ahmet B. Kizilkanat, Busra Akturk, Yusuf Kahraman
This research aims to develop a lightweight cementitious composite with satisfying mechanical and good thermal insulating properties. Two different types of hollow glass microspheres (HGM) were used as lightweight aggregates and were substituted with fine aggregate by 10, 20, and 40% by volume. The rheological, physical, mechanical, and microstructural properties of the resulting HGM-incorporated composites were investigated and correlations were established between physical and mechanical test results. The results showed that the physical and mechanical properties of individual HGM particles play a dominant role in the properties of lightweight mortars. HGM addition provided reductions up to 20% in the density and 45% in the thermal conductivity values of mortars compared to the reference. The best HGM ratio in the tested range was found as 20%, which provides benefits such as reduced density and enhanced thermal insulation capability without causing a significant reduction in compressive strength. It was concluded that HGMs can be used in the lightweight cementitious mortar production which has great potential in building applications to reduce the heating energy consumption.
{"title":"Lightweight Cement-Based Composites Incorporating Hollow Glass Microspheres: Fresh and Hardened State Properties","authors":"Nihat Kabay, Ahmet B. Kizilkanat, Busra Akturk, Yusuf Kahraman","doi":"10.18400/tekderg.677447","DOIUrl":"https://doi.org/10.18400/tekderg.677447","url":null,"abstract":"This research aims to develop a lightweight cementitious composite with satisfying mechanical and good thermal insulating properties. Two different types of hollow glass microspheres (HGM) were used as lightweight aggregates and were substituted with fine aggregate by 10, 20, and 40% by volume. The rheological, physical, mechanical, and microstructural properties of the resulting HGM-incorporated composites were investigated and correlations were established between physical and mechanical test results. The results showed that the physical and mechanical properties of individual HGM particles play a dominant role in the properties of lightweight mortars. HGM addition provided reductions up to 20% in the density and 45% in the thermal conductivity values of mortars compared to the reference. The best HGM ratio in the tested range was found as 20%, which provides benefits such as reduced density and enhanced thermal insulation capability without causing a significant reduction in compressive strength. It was concluded that HGMs can be used in the lightweight cementitious mortar production which has great potential in building applications to reduce the heating energy consumption.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45110232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Natural disasters, especially major earthquakes, cause widespread devastation in the built environment. Hence, the major component of the recovery in its aftermath constitutes a chain of projects starting at different times, having different costs and durations. In this study, the post disaster recovery curve modelled through a mathematical approach taking into account these properties of the projects. The approach followed is based on the project S-curve concept that provides the opportunity to simulate the progress by outlining the project spending. Well-known mathematical functions are adapted to model the project spending and the handover processes. Monte Carlo simulation is performed to evaluate the general behavior of the recovery curve using the model developed. Weibull distribution is used to generate the model’s parameters. Results of the Monte Carlo simulation demonstrate that the recovery process exhibits an S-shape, the duration of initial portion and the slope of the bulk portion being significantly governed by the level of preparedness of the community.
{"title":"Assessment of the Disaster Recovery Progress through Mathematical Modelling","authors":"S. Ü. Dikmen, R. Akbiyikli, M. Sönmez","doi":"10.18400/tekderg.473099","DOIUrl":"https://doi.org/10.18400/tekderg.473099","url":null,"abstract":"Natural disasters, especially major earthquakes, cause widespread devastation in the built environment. Hence, the major component of the recovery in its aftermath constitutes a chain of projects starting at different times, having different costs and durations. In this study, the post disaster recovery curve modelled through a mathematical approach taking into account these properties of the projects. The approach followed is based on the project S-curve concept that provides the opportunity to simulate the progress by outlining the project spending. Well-known mathematical functions are adapted to model the project spending and the handover processes. Monte Carlo simulation is performed to evaluate the general behavior of the recovery curve using the model developed. Weibull distribution is used to generate the model’s parameters. Results of the Monte Carlo simulation demonstrate that the recovery process exhibits an S-shape, the duration of initial portion and the slope of the bulk portion being significantly governed by the level of preparedness of the community.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41921906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Radwan, M. Abo-Hashema, Hamdy Faheem, M. Hashem
In many countries, incredible investments have been made in constructing roads that require conducting periodic evaluation and timely maintenance and rehabilitation (M&R) plan to keep the network operating under acceptable level of service. The timely M&R plan necessitates accurately predicting pavement performance, which is an essential element of road infrastructure asset management systems or Pavement Management Systems (PMS). Consequently, there is always a need to develop and to update performance prediction models embedded in PMS applications. This study focuses in developing distress prediction models for flexible pavements located in non-freeze climatic zone, which represent most of developing countries such as Egypt, using data extracted from the Long-Term Pavement Performance (LTPP) program. Ten distress performance prediction models were developed in this study for both wet- and dry-non freeze climatic zones, which are alligator (Fatigue) cracking, longitudinal cracking, transverse cracking, ravelling, bleeding, and rut depth models. These models can play an important role assisting decision makers in predicting pavement performance, identifying M&R needs, rational budget planning and resource allocation.
{"title":"Modeling Pavement Performance Based on LTPP Database for Flexible Pavements","authors":"M. Radwan, M. Abo-Hashema, Hamdy Faheem, M. Hashem","doi":"10.18400/tekderg.476606","DOIUrl":"https://doi.org/10.18400/tekderg.476606","url":null,"abstract":"In many countries, incredible investments have been made in constructing roads that require conducting periodic evaluation and timely maintenance and rehabilitation (M&R) plan to keep the network operating under acceptable level of service. The timely M&R plan necessitates accurately predicting pavement performance, which is an essential element of road infrastructure asset management systems or Pavement Management Systems (PMS). Consequently, there is always a need to develop and to update performance prediction models embedded in PMS applications. This study focuses in developing distress prediction models for flexible pavements located in non-freeze climatic zone, which represent most of developing countries such as Egypt, using data extracted from the Long-Term Pavement Performance (LTPP) program. Ten distress performance prediction models were developed in this study for both wet- and dry-non freeze climatic zones, which are alligator (Fatigue) cracking, longitudinal cracking, transverse cracking, ravelling, bleeding, and rut depth models. These models can play an important role assisting decision makers in predicting pavement performance, identifying M&R needs, rational budget planning and resource allocation.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43045828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The green building rating systems have been used as a tool to evaluate the environmental impact of buildings since 1990. In Turkey, LEED is in the first place concerning the total number of certified green buildings and then followed by BREEAM and DBGN. This paper aims to give general information concerning the 287 certified green buildings, and further investigate an updated situation of credit success rates of 127 LEED new construction certified green buildings in Turkey. The results of the study show that the certified green buildings in Turkey have a lower average percentage of credit success rates in indoor environmental quality, energy efficiency and material and resources categories compared with the other groups.
{"title":"Credit Success Rates of Certified Green Buildings in Turkey","authors":"V. Toğan, X. Thomollari","doi":"10.18400/tekderg.449251","DOIUrl":"https://doi.org/10.18400/tekderg.449251","url":null,"abstract":"The green building rating systems have been used as a tool to evaluate the environmental impact of buildings since 1990. In Turkey, LEED is in the first place concerning the total number of certified green buildings and then followed by BREEAM and DBGN. This paper aims to give general information concerning the 287 certified green buildings, and further investigate an updated situation of credit success rates of 127 LEED new construction certified green buildings in Turkey. The results of the study show that the certified green buildings in Turkey have a lower average percentage of credit success rates in indoor environmental quality, energy efficiency and material and resources categories compared with the other groups.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48126874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Istanbul's main lithological unit is a greywacke formation locally known as the Trakya Formation. It is weathered and extensively fractured, and the stress relief induced by deep excavations causes excessive displacements in the horizontal direction. Therefore, predicting excavation-induced wall displacements is critical for avoiding damages. The aim of this study is to develop an Artificial Neural Network (ANN) model to predict anchored-pile-wall displacements at different stages of excavations performed on Istanbul's greywacke formations. A database was created on excavation and monitoring data from 11 individual projects in Istanbul. Five variables were used as input parameters, namely, excavation depth, maximum ground settlement measured behind the wall, system stiffness, standard penetration test N value of the soil depth, and index-of-observation point. The proposed model was trained, validated, and tested. Finally, two distinct projects were numerically modeled by applying the finite element method (FEM) and then used to examine the performance of the ANN model. The displacements predicted by the ANN model were compared with both the computed values obtained from the FEM analysis and actual measured displacements. The proposed ANN model accurately predicted the displacement of anchored pile walls constructed on Istanbul's greywackes at different excavation stages.
{"title":"Artificial Neural Network Model to Predict Anchored-Pile-Wall Displacements on Istanbul Greywackes","authors":"Özgür Yıldız, M. Berilgen","doi":"10.18400/tekderg.492280","DOIUrl":"https://doi.org/10.18400/tekderg.492280","url":null,"abstract":"Istanbul's main lithological unit is a greywacke formation locally known as the Trakya Formation. It is weathered and extensively fractured, and the stress relief induced by deep excavations causes excessive displacements in the horizontal direction. Therefore, predicting excavation-induced wall displacements is critical for avoiding damages. The aim of this study is to develop an Artificial Neural Network (ANN) model to predict anchored-pile-wall displacements at different stages of excavations performed on Istanbul's greywacke formations. A database was created on excavation and monitoring data from 11 individual projects in Istanbul. Five variables were used as input parameters, namely, excavation depth, maximum ground settlement measured behind the wall, system stiffness, standard penetration test N value of the soil depth, and index-of-observation point. The proposed model was trained, validated, and tested. Finally, two distinct projects were numerically modeled by applying the finite element method (FEM) and then used to examine the performance of the ANN model. The displacements predicted by the ANN model were compared with both the computed values obtained from the FEM analysis and actual measured displacements. The proposed ANN model accurately predicted the displacement of anchored pile walls constructed on Istanbul's greywackes at different excavation stages.","PeriodicalId":49442,"journal":{"name":"Teknik Dergi","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46195024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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