Turkish Journal of Civil Engineering最新文献_第4页

Analysis of the Hydrodynamic Characteristics in a Rectangular Clarifier under Earthquake-Induced Sloshing 地震晃动作用下矩形澄清池水动力特性分析

Turkish Journal of Civil Engineering Pub Date : 2023-05-01 DOI: 10.18400/tjce.1268771

M. Aksel

{"title":"Analysis of the Hydrodynamic Characteristics in a Rectangular Clarifier under Earthquake-Induced Sloshing","authors":"M. Aksel","doi":"10.18400/tjce.1268771","DOIUrl":"https://doi.org/10.18400/tjce.1268771","url":null,"abstract":"Wastewater treatment plants, which play a crucial role in protecting the hydrosphere, are earthquake-prone infrastructures with large tanks and sensitive equipment. Damage to the structures in such facilities during seismic activity on the lithosphere can cause environmental pollution and threaten public health. Since the units/tanks in the treatment plants are not of different geometries and sizes, they may exceed the freeboard of the wave height due to the sloshing event. In this study, the sloshing dynamics of a rectangular type of clarifier were investigated. First, numerical parameters, boundaries, and initial conditions were validated using the results of an experimental campaign. Secondly, model conditions were kept constant, and geometry was enlarged (i.e., scaled-up) to investigate the variation of hydrodynamic forces near vulnerable equipment (such as scrapers and weirs) in clarifier. The numerical model was run for characteristics of two different earthquakes (i.e., Chi Chi-1999 and Kocaeli-1999). The results showed that dynamic pressure values near vulnerable equipment increased up to 120 times higher than the operating conditions. The maximum sloshing wave heights were calculated as 1.2 m and 1.45 m for Chi Chi (1999) and Kocaeli (1999) earthquakes, respectively.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122804781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mineral Katkı İkamesinin Kalsiyum Alümina Çimentolu Harçların Taze Hal ve Zamana Bağlı Sertleşmiş Hal Özelliklerine Etkileri

Turkish Journal of Civil Engineering Pub Date : 2023-05-01 DOI: 10.18400/tjce.1288033

Faruk Eren, Muhammer Keski̇nateş, Burak Felekoğlu, Kamile TOSUN FELEKOĞLU

{"title":"Mineral Katkı İkamesinin Kalsiyum Alümina Çimentolu Harçların Taze Hal ve Zamana Bağlı Sertleşmiş Hal Özelliklerine Etkileri","authors":"Faruk Eren, Muhammer Keski̇nateş, Burak Felekoğlu, Kamile TOSUN FELEKOĞLU","doi":"10.18400/tjce.1288033","DOIUrl":"https://doi.org/10.18400/tjce.1288033","url":null,"abstract":"Kalsiyum alüminat çimentoları (KAÇ) bir onarım malzemesinden beklenen; hızlı sertleşme, iyi yapışma, mevcut betonla uyumluluk, boyutsal kararlılık ve korozyon direnci gibi özellikleri sağlamaya aday bir alternatif bağlayıcıdır. Hidratasyon ürünleri arasında suda çözünür kireç olmaması da önemli bir avantaj olarak görülebilir. Ancak KAÇ’ın zaman içerisinde ortam koşullarına bağlı olarak faz yapısında meydana gelebilen dönüşüm reaksiyonları, bu çimento ile üretilen betonlarda dayanım kaybına neden olabilmektedir. Bu çalışmada KAÇ’ın hidratasyon sürecindeki dönüşüm reaksiyonlarından kaynaklanan problemlere çözüm sunmak, taze hal özelliklerini geliştirmek ve uzun dönemde dayanım gelişimini kararlı hale getirmek amaçlanmıştır. Buna bağlı olarak, farklı mineral katkı kaynaklarının (SiO2 ve CaSO4), KAÇ ile birlikte kullanımının harç kıvamı, priz süresi ve reolojik özelliklere etkileri incelenmiştir. Sertleşmiş halde aşınma dayanıklılığı ve zamana bağlı basınç ve eğilme dayanımı gelişimleri belirlenmiştir. Deneysel çalışmalar sonucunda, %16 SiO2 katkılı ve %50 CaSO4 katkılı KAÇ içeren harçların, taze hal özelliklerinde kullanım alanlarına uygun gelişmiş özellikler kazandırabildiği ve hidratasyon sürecinde kararlı ürünler elde ederek zamana bağlı bir mukavemet kaybına uğramadan, 400 günlük periyot sonunda dayanım gelişimi gösterdiği sonucuna ulaşılmıştır.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115381836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Identification of Dispute Sources in the Construction Industry via Court Files 通过法庭档案识别建筑业纠纷的来源

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1224425

Murat Cevikbas

{"title":"Identification of Dispute Sources in the Construction Industry via Court Files","authors":"Murat Cevikbas","doi":"10.18400/tjce.1224425","DOIUrl":"https://doi.org/10.18400/tjce.1224425","url":null,"abstract":"Contracting parties generally tend to resolve their disputes through the litigation process. The lengthy litigation process reduces the belief among the parties that the disputes are resolved peacefully, and this destabilizes the sustainable structure of the construction industry where disputes are very common. Determining the most common sources of disputes in construction lawsuits is very important in terms of taking necessary precautions beforehand. Additionally, increasing the competency levels of construction and judicial actors regarding construction processes is extremely important in terms of making the judicial process more efficient and faster. Therefore, this study aims to reveal the most frequent dispute sources in the construction industry, the competency levels of judicial actors including expert witnesses and the average duration of the construction-related litigation process for the superior courts. Hence, 346 construction-related lawsuits conducted between 2018 and 2021 were examined via content analysis to classify the common themes. Lawsuits were investigated via the official websites of Courts of Cassation and National Judicial Network Information System (UYAP). Next, the frequency analysis was conducted to detect the significance of each theme via SPSS software. It is highly believed that this study will enable the decision-makers to take necessary precautions before the dispute occurs as well as improve the dispute resolution process in the construction industry. Projects related to superstructure works constituted the majority of the disputes ending up with the judicial process. Additionally, the majority of the disputes detected from lawsuits resulted from “Debit and Credit” related issues. Moreover, the litigation process was also detected as a very lengthy process. Furthermore, it is detected that majority of the lawsuits were rejected by the Courts of Cassation due to inadequacies of the competency levels of the judicial actors.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114640690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Finite Element Analysis and Investigation of Critical Impact Point of Steel Guardrails Affecting Safety and Structural Performance 钢护栏影响安全与结构性能的临界冲击点有限元分析与研究

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1238657

Sedat Ozcanan

{"title":"Finite Element Analysis and Investigation of Critical Impact Point of Steel Guardrails Affecting Safety and Structural Performance","authors":"Sedat Ozcanan","doi":"10.18400/tjce.1238657","DOIUrl":"https://doi.org/10.18400/tjce.1238657","url":null,"abstract":"After the guardrails are designed, the structural adequacy and safety criteria are determined by the relevant standards and full-scale crash tests. One of the widely used standards is European Norm 1317 (EN1317). Guardrail systems generally consist of rails and posts. The guardrails are more rigid around the posts, which are mounted on the ground or embedded in soil at certain intervals. Therefore, it is important for driver/passenger and roadside safety to determine the most critical point in terms of structural and safety performance and design according to the most unfavorable situation. With this motivation, in this study, the effect of different impact points on the structural and safety performance of the H1W4 guardrail was investigated by finite element (FE) analysis. For this purpose, first of all, the finite element models of the H1W4-A system were calibrated and validated with real crash test data. Then, with the help of the validated models, analyses were completed for different impact points as 0.5, 1.0, 1.5 and 2.0 meters with a half-meter difference for the standard 2-meter post spacing. In the light of the measured safety parameters such as Acceleration Severity Index (ASI), Theoretical Head Impact Velocity (THIV) and structural performance criteria such as working width (W) and exit angle (α), the critical impact point for the guardrail was determined. Contrary to what is generally known, crashing vehicles into flexible points (0.5 and 1.0 m) rather than impacting rigid points (1.5 and 2.0 m) creates a more negative situation in crash tests.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127019682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheological Performance of High and Low Temperature of ZycoTherm/Nano-Silica Composite Modified Binders ZycoTherm/纳米二氧化硅复合改性粘合剂的高低温流变性能

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1239171

Shaban Ismael Albrka Ali, Dania Alothman, H. Gökçekuş

{"title":"Rheological Performance of High and Low Temperature of ZycoTherm/Nano-Silica Composite Modified Binders","authors":"Shaban Ismael Albrka Ali, Dania Alothman, H. Gökçekuş","doi":"10.18400/tjce.1239171","DOIUrl":"https://doi.org/10.18400/tjce.1239171","url":null,"abstract":"This study aims to investigate the impact of control and warm mix binders modified with Nano-Silica on the asphalt binder functioning to resist rutting endurance and low-temperature cracking. According to asphalt binder weight, the percentages of Nano-Silica employed in this research were 2%, 4%, and 6%. The control and modified binders were evaluated by performing conventional and rheological tests. The rheological properties were examined by master curves, isochronal plots, multiple stress creep recovery (MSCR), Superpave rutting parameter, and bending beam rheometer. The outcomes implied that the performance of the asphalt binder (with or without ZycoTherm) improved when Nano-Silica was added concerning (G*/sin δ) parameter. The MSCR test demonstrated that the recovery (R %) of the control and warm mix binders improved whereas the non-recoverable creep compliance (Jnr) dropped, implying that Nano-Silica boosted the rutting potential. Moreover, it was observed at different temperatures that the values for the complex shear modulus raised when the phase angle values were reduced. Furthermore, at low temperatures, it is presumed that the performance of Nano-Silica modified asphalt binders will have minimal performance as opposed to the binders prepared with ZycoTherm, which prevents low-temperature cracking.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114623301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mesnetlerinden Farklı Yer Hareketi Etkisindeki Kablo Destekli Köprülerin Yapı-Zemin Etkileşim Analizi

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1224420

Hüseyin Kartal, Kurtuluş Soyluk

引用次数: 0

Effects of Pore Fluid and Surface Roughness on Geomembrane - Soil Interface Behavior 孔隙流体和表面粗糙度对土工膜-土界面行为的影响

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1224424

Inci Develioglu, H. F. Pulat

{"title":"Effects of Pore Fluid and Surface Roughness on Geomembrane - Soil Interface Behavior","authors":"Inci Develioglu, H. F. Pulat","doi":"10.18400/tjce.1224424","DOIUrl":"https://doi.org/10.18400/tjce.1224424","url":null,"abstract":"In this study, direct shear tests were conducted on soil - geomembrane interfaces. Sand/bentonite mixture and crushed sand were tested in contact with two geomembranes of the same type. To examine the effect of leachate on the mechanical properties of the geomembrane, acidic mine drainage, coal combustion product, and municipal solid waste leachates were prepared in the laboratory. The initial void ratio and internal friction angles of sand/bentonite and crushed sand were 0.34, 0.52, and 23⁰, 35⁰, respectively. In the smooth geomembrane - soil interface, the minimum interface friction angle (18⁰) was obtained on acidic mine drainage cured geomembrane – sand/bentonite, while the maximum (31⁰) interface friction angle was obtained on uncured geomembrane - crushed sand. In the textured geomembrane - soil interface, the minimum interface friction angle (17⁰) was obtained on acidic mine drainage cured geomembrane – sand/bentonite, while the maximum (43⁰) interface friction angle was obtained on uncured geomembrane - crushed sand. The friction angle of the crushed sand - geomembrane surface is higher than the friction angle of the sand/bentonite - geomembrane surface. While acidic mine drainage is the leachate that affects the shearing behavior of the geomembrane in the most negative way, coal combustion product is the leachate that has the least negative impact.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"344 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123104555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strengthening System Effects on the Out-Of-Plane Mechanisms Activation of Masonry Walls under Tsunami Loads 海啸作用下加固体系对砌体墙面外机构激活的影响

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1247194

Stefano Belliazzi, G. Lignola, A. Prota

引用次数: 0

Replacement of Stirrups by Steel Fibers in Shear Dominant UHPFRC Beams 在抗剪优势的UHPFRC梁中用钢纤维代替箍筋

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1237663

Umut Hasgül, A. Yavas, Tamer Birol

{"title":"Replacement of Stirrups by Steel Fibers in Shear Dominant UHPFRC Beams","authors":"Umut Hasgül, A. Yavas, Tamer Birol","doi":"10.18400/tjce.1237663","DOIUrl":"https://doi.org/10.18400/tjce.1237663","url":null,"abstract":"In the present study, the impacts of variety of fiber types and amounts on shear dominant Ultra High Performance Fiber Reinforced Concrete (UHPFRC) beams and the feasibility of fully replacement of stirrups by the steel fibers were investigated. Fifteen UHPFRC beams containing five different fiber types and three volume fractions were prepared without stirrup and were loaded under four-point loading. The influences of steel fiber were discussed in terms of the load-deflection behavior, cracking behavior, collapse modes, ultimate shear strength, nominal moment capacity and deflection ductility. The steel fiber use prominently increased the post-cracking stiffness and load capacity of the UHPFRC beams with the help of the fibers’ crack-bridging ability. Conversely, the steel fibers in different types didn’t have an importance on the collapse mode of the shear dominant UHPFRC beams. The use of straight steel fibers in the UHPFRC beams, even at very low volume fractions of 0.5%, changed the collapse condition from shear to flexure resulting in a ductile behavior. But the hooked fiber inclusion by 1.5 vol% at least is needed to guarantee the flexural behavior regardless of hooked or multi hooked-end form.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127340657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kohezyonsuz Zeminde Kazık Aralığının Belirlenmesi ve Temel Davranışının Deneysel İncelenmesi

Turkish Journal of Civil Engineering Pub Date : 2023-03-01 DOI: 10.18400/tjce.1244594

Ercan Egemen Başar, İ. Çeli̇k, Münire Findik, Soner Uzundurukan

引用次数: 0