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Preparation and Performance Testing of SBS Modified Bitumens Reinforced with Halloysite and Sepiolite Nanoclays 海泡石和海泡石纳米粘土增强SBS改性沥青的制备及性能测试
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2022-03-01 DOI: 10.18400/tekderg.683568
Dilay Uncu, A. Topal, Özgür Seydibeyoğlu
In this study, halloysite and sepiolite nanoclays were used to reinforce SBS modified bitumens. The nanoclays used are different from the materials in the literature and have properties such as easy to find, economical and available from local sources. The mixing parameters were determined before production process. The polymer additive SBS was added into base bitumen at 3% and 5%, the nanoclay additives were added into polymer modified bitumen at 2% and 4% ratios. The morphological structures were investigated under fluorescence microscope. Physical and rheological properties of the samples were compared. The phase separation cases were investigated by storage stability test. Furthermore, rutting performance of samples was measured with zero shear viscosity (ZSV) and multi stress creep recovery (MSCR) test methods.
本研究采用高岭土和海泡石纳米粘土对SBS改性沥青进行加固。所使用的纳米粘土与文献中的材料不同,具有容易找到、经济且可从当地获得的特性。在生产前确定了混合参数。在基础沥青中分别以3%和5%的比例添加聚合物添加剂SBS,在聚合物改性沥青中分别以2%和4%的比例添加纳米粘土添加剂。荧光显微镜下观察其形态结构。比较了样品的物理和流变性能。通过贮存稳定性试验考察了相分离情况。此外,采用零剪切粘度(ZSV)和多应力蠕变恢复(MSCR)试验方法对样品的车辙性能进行了测试。
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引用次数: 0
Investigation of Local Scour Hole Dimensions around Circular Bridge Piers under Steady State Conditions 稳态条件下圆形桥墩局部冲刷孔尺寸研究
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2022-03-01 DOI: 10.18400/tekderg.704352
Ömer Yavuz Eski, A. Aksoy
The local scour around bridge piers is one of the main causes of bridge failures. In this study, scour hole dimensions around circular bridge piers were investigated under clear water scour conditions for various steady flow rates. The experiments were performed with four different bridge pier diameters and seven different flow rates by using uniform sediment with a median diameter of 1.63 mm and geometric standard deviation of 1.3. After each experiments the bathymetry of scour hole was determined. New empirical equations to estimate scour hole length, scour hole width and scour hole volume (V) are proposed by using experimental findings and experimental data available in the literature. The experimental results were also compared with those calculated using several empirical equations given by previous studies. Since there is a lack of data about scour hole dimensions, the experimental findings presented in this study are useful for the researchers investigating the local scour process, and have contributed to the few experimental data in the literature.
桥墩周围的局部冲刷是桥梁失效的主要原因之一。在本研究中,研究了在不同稳定流速的清水冲刷条件下圆形桥墩周围的冲刷孔尺寸。实验采用四种不同的桥墩直径和七种不同的流速,使用中值直径为1.63 mm、几何标准偏差为1.3的均匀沉积物进行。在每次试验后,确定了冲刷坑的水深。利用文献中的实验结果和实验数据,提出了新的经验公式来估计冲刷坑长度、冲刷坑宽度和冲刷坑体积(V)。实验结果还与以前研究中给出的几个经验方程计算的结果进行了比较。由于缺乏关于冲刷坑尺寸的数据,本研究中提出的实验结果对研究局部冲刷过程的研究人员很有用,并为文献中为数不多的实验数据做出了贡献。
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引用次数: 0
Causal Relationships of Readability Risks in Construction Contracts 施工合同可读性风险的因果关系
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2022-03-01 DOI: 10.18400/tekderg.962928
K. Koc, A. Gurgun
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引用次数: 1
Developing A Virtual Safety Training Tool for Scaffolding and Formwork Activities 开发脚手架和模板活动的虚拟安全培训工具
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2022-03-01 DOI: 10.18400/tekderg.711091
G. Kazar, Semra Comu
As occupational accidents usually occur due to unsafe human behaviors in the construction industry, safety training is inevitably necessary for site personnel. On construction sites, various training methods including traditional and innovative ones, have been adopted to prevent accidents. In recent years, virtual safety training has been more prevalent because of providing highly engaging practice in a risk-free environment. Although these training tools have innumerable advantages in providing safety knowledge and awareness, they can be further improved. This study introduces a virtual safety training tool, V-SAFE.v2, to provide a more reliable and effective safety training for high-risk construction works. V-SAFE.v2 consists of three main modules; i) Training Module, ii) Testing Module 1, and iii) Testing Module 2. These modules are generated firstly to provide safety training for scaffolding and formwork activities and then to evaluate the safety performance of the trainees. An experiment was conducted with fifteen construction workers and ten engineers to measure the effectiveness of the training tool. The findings showed that V-SAFE.v2 is a reliable safety training tool for high-risk construction tasks as it supports collaboration, provides individual feedback, and repeatable practice. Also, the participants stated that V-SAFE.v2 has a great potential to reduce the falling from height accidents in the construction workplaces.
由于建筑行业的职业事故往往是由不安全的人类行为引起的,因此对现场人员进行安全培训是不可避免的。在施工现场,采取了包括传统和创新在内的各种培训方法,以防止事故的发生。近年来,由于在无风险的环境中提供高度参与的实践,虚拟安全培训变得更加普遍。虽然这些培训工具在提供安全知识和意识方面有无数的优势,但它们可以进一步改进。本研究介绍了虚拟安全培训工具V-SAFE。V2,为高风险建筑工程提供更可靠及有效的安全训练。v安全。V2主要由三个模块组成;i)培训模块,ii)测试模块1,iii)测试模块2。这些模块首先为脚手架和模板活动提供安全培训,然后评估学员的安全表现。我们对15名建筑工人和10名工程师进行了实验,以衡量培训工具的有效性。研究结果表明,V-SAFE。V2是一个可靠的高风险施工任务的安全培训工具,因为它支持协作,提供个人反馈和可重复的实践。此外,与会者表示,V-SAFE。V2在减少建筑作业场所的高空坠落事故方面具有很大的潜力。
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引用次数: 5
Fundamental Frequencies of Elliptical Plates using Static Deflections 使用静态偏转的椭圆板基频
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2022-01-01 DOI: 10.18400/tekderg.817251
M. Altekin
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引用次数: 0
Experimental Study on the Behavior of Header End - Plate Connections under Cyclic Loading 循环荷载作用下箱头端板连接性能试验研究
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2021-11-01 DOI: 10.18400/tekderg.674889
A. Karasu, Cüneyt Vatansever
This paper presents the results from experimental study on the actual behavior of header end-plate connections. To better understand the hysteretic behavior of these connections in terms of the stiffness and the strength, sixteen specimens were considered and subjected to cyclic loads. The effect of some parameters such as thickness of the header end-plate, depth of the connection and the number of bolt rows on the behavior of header end-plate connections has been investigated by the help of experimental tests and finite element (FE) analyses. The moment-rotation relations of the connections governed by three parameters such as, initial stiffness, moment capacity and rotation capacity were obtained. Results revealed that the moment capacity increases with the increase in end-plate thickness and depth of connection. However, for the equal connection depth, increasing the number of bolt rows has not influenced the connection behavior remarkably.
本文介绍了对头端板连接的实际性能进行试验研究的结果。为了更好地理解这些连接在刚度和强度方面的滞回行为,考虑了16个试件并进行了循环荷载。通过试验试验和有限元分析,研究了连轴器端板厚度、连接深度和螺栓列数等参数对连轴器端板连接性能的影响。得到了由初始刚度、弯矩承载力和转动承载力三个参数控制的节点弯矩-转动关系。结果表明,弯矩承载力随端板厚度和连接深度的增加而增大。而在连接深度相同的情况下,增加螺栓列数对连接性能的影响并不显著。
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引用次数: 0
Data Collection for Implementation of the Mechanistic-Empirical Pavement Design Guide (MEPDG) in Izmir, Turkey 在土耳其伊兹密尔实施机械经验路面设计指南(MEPDG)的数据收集
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2021-11-01 DOI: 10.18400/tekderg.651399
Mohammad Razeq Shakhan, A. Topal, Burak Şengöz
Developing countries like Turkey are trying to implement the Mechanistic-Empirical Pavement Design Guide (MEPDG). The implementation of this method requires comprehensive local data collection, evaluation, and, if necessary, a local calibration. The objective of this study is to prepare local data such as climate, traffic, and materials for evaluation and local calibration of MEPDG for Izmir City. For this purpose, the climate and traffic data were obtained, analysed, and converted to the MEPDG format. Besides, the bound and unbound pavement material properties were determined. Since some of the obtained local data like climate, vehicle classification, traffic growth factor, and axle load distribution cannot be directly used as design inputs, they were developed and converted to a suitable format to be used in the MEPDG. The output of this study can be used as design inputs for the evaluation and local calibration the MEPDG in Izmir and serves as a guide for data preparation for other parts of the country.
像土耳其这样的发展中国家正在尝试实施《机械经验路面设计指南》(MEPDG)。该方法的实施需要全面的本地数据收集、评估,必要时还需要进行本地校准。本研究的目的是为伊兹密尔市MEPDG的评估和本地校准准备当地数据,如气候、交通和材料。为此,获取、分析了气候和交通数据,并将其转换为MEPDG格式。测定了粘结和非粘结路面材料的性能。由于获得的一些当地数据,如气候、车辆分类、交通增长系数和轴重分布等不能直接用作设计输入,因此我们对这些数据进行了开发并转换为适合的格式,以便在MEPDG中使用。本研究的结果可作为伊兹密尔MEPDG评估和本地校准的设计输入,并可作为该国其他地区数据准备的指南。
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引用次数: 5
Effect of the Gravel Zone Thickness Created in the Deep Well Test Simulation on the Operating Characteristics of the Pump and Head Loss 深井试验模拟中形成的砾石层厚度对泵工作特性及扬程损失的影响
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2021-11-01 DOI: 10.18400/tekderg.691948
N. Orhan, O. Özbek, A. Şeflek
This study was conducted in a deep well simulator used for typical irrigation studies. In this work, the changes in the pump flow rate, drawdown, noise level, and pump pressures were analyzed for three different gravel zone thicknesses used in the well. From the study, it was found that a high gravel zone thickness increased the well’s drawdown levels during pumping. For drawdown values of 40, 45, 50 and 55 m3 h–1, an increase in the gravel thickness by 10 cm increased these values by 2.92, 2.41, 2.38 and 2.37 times, respectively. When the gravel thickness was doubled (from 5 cm to 10 cm), the hydraulic conductivity decreased by about half and head loss doubled. As a result, gravel thickness directly affected the drawdown rate of the pump. It was shown that different drawdown values resulting due to different gravel thicknesses should be taken into consideration when placing the pump in a deep well.
本研究是在一个用于典型灌溉研究的深井模拟器中进行的。在这项工作中,分析了井中使用的三种不同砾石层厚度的泵流量、压降、噪声水平和泵压力的变化。研究发现,在泵送过程中,高砾石层厚度增加了井的压降水平。当压降为40、45、50和55 m3 h-1时,碎石厚度每增加10 cm,压降值分别增加2.92倍、2.41倍、2.38倍和2.37倍。当砾石厚度增加一倍(从5 cm增加到10 cm)时,导流率降低约一半,水头损失增加一倍。因此,砾石厚度直接影响泵的压降速率。结果表明,在深井中安装泵时,应考虑不同砾石厚度导致的不同压降值。
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引用次数: 1
Evaluation of Load-Transfer Efficiency of Steel Mesh Reinforced Contraction Joints in Concrete Pavement: Accelerated Pavement Test and FE Analysis 钢筋网收缩缝在混凝土路面中的荷载传递效率评估:加速路面试验和有限元分析
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2021-11-01 DOI: 10.18400/tekderg.643027
Muhammet Çelik, Mehmet Tevfik Seferoğlu, M. Akpınar, M. Nasery, Ayşegül Güneş Seferoğlu
Transverse contraction joints are by far the most common type of joint in jointed plain concrete pavements. Early loading of contraction joints can create a weakened vertical plane and later grow as a full-depth crack. In this study, load transfer efficiency (LTE) of steel mesh reinforced transverse contraction joints were studied at accelerated pavement tests (APT). 3D finite element (FE) model of jointed plain concrete pavement (JPCP) was developed to study deflections and crack propagation in just under the joint of the concrete pavement. The APT tests were focused on the LTE values before and after the crack initiation under the contraction joint region. Experiments were performed on three slabs in which two of these slabs were prepared without reinforcement and one of them was reinforced with steel mesh. Data generated by APT was used for verification of crack propagation modeling in the finite element analysis. Steel mesh reinforced slab gave the lowest vertical deflections (51μm) and highest LTE (91.56%). The LTE value in the reinforced slab after 25,000 passes was 13.63% higher than the average of unreinforced slabs. The findings suggest that the load transfer efficiency was found to be a complex parameter and should be interpreted together with average displacement values when contraction joints are evaluated at early traffic loadings.
横向收缩缝是迄今为止在平面混凝土路面中最常见的接缝类型。收缩缝的早期加载会产生一个弱垂面,后期会发展为全深度裂缝。本文研究了钢网加筋横向伸缩缝在加速路面试验中的荷载传递效率。建立了平面节理混凝土路面的三维有限元模型,研究了混凝土路面节理正下方的挠度和裂缝扩展。APT试验主要研究收缩节理区域裂纹萌生前后的LTE值。试验采用3块板,其中2块板不加筋,1块板加钢网加固。利用APT生成的数据对有限元分析中的裂纹扩展模型进行验证。钢网加筋板竖向挠度最小(51μm), LTE最高(91.56%)。加筋板25000道次后的LTE值比未加筋板的平均值高13.63%。研究结果表明,荷载传递效率是一个复杂的参数,在评估早期交通荷载时,应与平均位移值一起进行解释。
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引用次数: 0
Kısa Zamanlı Trafik Tahmini ile Devre Süresi Optimizasyonu ve Gecikme Analizi 基于短期交通猜测的方向优化与过渡分析
IF 1.3 4区 工程技术 Q3 Engineering Pub Date : 2021-09-01 DOI: 10.18400/TEKDERG.713080
Ravza Nur Yiğit, Soner Haldenbilen
Calismada akilli ulasim sistemleri icin parametrik ve parametrik olmayan tahmin yontemlerin kisa zamanli trafik tahmin performanslari incelenmis ve tahmin degerlerinin sinyalize kavsaklarin devre suresine ve performansina olan etkisi arastirilmistir. Kavsakta gozlemlenen trafik verilerine bagli olarak gecikme surelerinin iyilestirmesi ve kavsak bekleme surelerinin azaltilarak, kavsak performans iyilestirmesi amaclanmistir. Calisma bolgesi olarak Denizli ilinde yer alan Mimar Sinan kavsagi secilmistir. Kavsagin yaklasim kollarinda bulunan sensorler yardimiyla elde edilen veriler, veri setleri olarak duzenlenmistir. Oto-regresif entegre hareketli ortalama (Auto-Regressive Integrated Moving Average-ARIMA) ve yapay sinir aglari (YSA) yontemleri ile kisa zamanli trafik tahminleri yapilmistir. Tahmin sonuclari Webster yontemi kullanilarak kavsak devre suresi optimizasyonu yapilmistir. Optimum devre suresi ve yesil sureleri hesaplandiktan sonra Webster gecikme metodu ile kavsak yaklasim kollarinin ve kavsak genelinin gecikme degerleri hem ARIMA yonteminden elde edilen hem de YSA yonteminden elde edilen tahmin sonuclari karsilastirilmistir. Kisa zamanli trafik tahmininde YSA yonteminin ARIMA yontemine gore daha basarili oldugu gorulmustur.
calismus中非参数和非参数输入系统的概率是分析短期交通预测性能,以及对获得估计点信号的人的圆表面和性能的影响。在高加索地区交通受损的情况下,旨在改善延迟图像,减少预期图像并提高性能。Mimar Sinan的战场位于海边,被称为Calisma。Kavsagin-yaklasim臂中的传感器可以在数据的帮助下获得,数据集可以是duzenlenmist。自回归综合移动平均ARIMA和人工神经节点(YSA)的同时传输预测。Tahmin sonuclari Webster yontemi kullanilarak kavsak devre suresi optimizaonu yapilmistir。在计算出最佳圆形图像和原材料后,韦伯斯特延迟方法将降低ARIMA化合物和YSA化合物对燃烧臂的预测效果和一般群体的延迟率。在短期交通量估计中,YSA的ARIMA浓度估计高于此。
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引用次数: 2
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