Turan Arslan - Academia.edu (original) (raw)

Papers by Turan Arslan

SSRN Electronic Journal, 2021

Choosing appropriate public transportation systems is of crucial importance for sustainable devel... more Choosing appropriate public transportation systems is of crucial importance for sustainable development for the region. It naturally requires consideration of a variety of important criteria. Among them, speed, comfort, economy and safety are the most important ones that should be taken into consideration during transportation planning and modeling process. Adequately responding to future demand expectations is critical for the success. The key is to carefully assess existing system. This is also essential for accomplishing efficient use of limited public resources. Therefore, proper modeling of public transportation systems reflecting actual conditions is imperative for obtaining desired results. In this study, firstly the existing LRT system of Bursa, Turkey, is scrutinized. Then, it is examined to see how a BRT system would have responded to the existing demand in terms of capacity and comfort if the existing LRT system were replaced with an imaginary BRT system. All models are d...

Uludağ University Journal of The Faculty of Engineering, 2016

The role of tramways as an alternative public transportation system has been increasing in urban ... more The role of tramways as an alternative public transportation system has been increasing in urban transportation system. Although, the use of tramway is not at desired level compared to the use of rubber-tired based public transportation modes in Turkey, the SilkWorm (Ipekbocegi), being the first domestic tram produced in Turkey, will have a great impact on Turkey rail public transportation system. However, some arguments have arisen over its first operation on T1 tram line in Bursa which was built in the end of 2013. Though, it is relatively very new one, some problems have already been observed on this line. The available data are not enough yet to do some analysis, therefore only a simple SWOT analysis is carried out to define the problems that appeared after its operation on the line and to put forward some possible solutions for them.

Pamukkale University Journal of Engineering Sciences, 2011

Due to overlapping jurisdictional boundaries between the city municipality and township municipal... more Due to overlapping jurisdictional boundaries between the city municipality and township municipalities, Antakya resembles metropolises, however its administrative and regulatory framework are not similar; this particular situation creates a serious difficulty in solving especially transportation related problems. It results in conflicts within jurisdictions between the city and township municipalities particularly on taking actions against those problems. This, moreover, creates problems and hurdles in achieving sustainable development for the city. Especially the increasing use of private cars has, recently, put burdens on non-adequate transport infrastructure and aggravated the existing problems. The increasing congestion, accidents, and environmental and social problems call for necessary decisive actions and policies. However, in order to achieve success in the actions and policies, re-organization of the administrative structure of the transport policymaking is evident. In this...

Engineering review, 2016

Delay and number of vehicle stops are important indicators that define the level of service of a ... more Delay and number of vehicle stops are important indicators that define the level of service of a signalized intersection. Therefore, they are usually considered for optimizing the traffic signal timing. In this study, ANNs are employed to model delay and the number of stops estimation at signalized intersections. Intersection approach volumes, cycle length and left turn lane existence were utilized as input variables since they could easily be obtained from field surveys. On the other hand, the average delay and the number of stops per vehicle were used as the output variables for the ANNs models. Four-leg intersections were examined in this study. Approach volumes including turning volumes are randomly generated for each lane of these intersections, then the traffic simulation program was run 196 times with each generated data. Finally, average delay and the number of stops per vehicle were obtained from the simulations as outputs. In this study, various network architectures were...

The size effect is an important application of concrete fracture mechanics. Therefore, many studi... more The size effect is an important application of concrete fracture mechanics. Therefore, many studies have been done on determining the size effect on concrete structures in recent years, most of which have been carried out by using specimens under uniaxial tensile stress. However, many reinforced concrete structures, such as slabs, pavements and concrete roads concrete are subjected to biaxial tension. Therefore, determining tensile strength of concrete is crucial to better design of the concrete structures. In this study, the size effect on the tensile strengths of mortar mixtures is investigated. The triangular plate method is used to find the size effect on the tensile strength of the mortar mixture. For this purpose, the mortar mixture specimens containing steel fibers that have 0.42 water-cement (w/c) ratio with various sizes in triangular form are prepared and analyzed. A total of 15 specimens triangular plate with 5 different sizes that contains 1% steel fibers in volume are p...

Transportation Research Record: Journal of the Transportation Research Board, 2020

As car ownership soars, traffic congestion and its associated negative impacts have become real c... more As car ownership soars, traffic congestion and its associated negative impacts have become real concerns in many cities around the world. Therefore, transportation systems that perform better in eliminating or reducing traffic congestion and related problems to tolerable levels have become imperative. Alternative transit systems should be assessed properly to accommodate the expected demand in the long term, at least, to some significant extent. However, this is generally neglected in developing countries and, among many possible alternatives, a popular transportation system is usually preferred within the available budget. As an example, Bursa Metropolitan Municipality, Turkey, has recently implemented a light rail transportation system (LRT) on its major east–west corridor as the main transit system. In this study, the existing LRT is assessed and its performance is compared with a hypothetical bus rapid transit (BRT) system, which is a strong contender and comparatively a lower-c...

IEEE Access, 2020

Based on the concepts of sensory thresholds, the Weber-Fechner Law in psychology has usually been... more Based on the concepts of sensory thresholds, the Weber-Fechner Law in psychology has usually been applied to sensory dimensions. However, some neurophysiological studies have shown that assessment of mental numbers or numerical information also follows this law. Therefore this paper proposes a modification of VIKOR that reflects the Weber-Fechner law to account for nonlinearity in evaluation scales as perceived by decision-makers. The model is applied to a case where public approval of two different types of public bus operation systems considering six criteria is pursued. The results are compared with those obtained from the multi-attribute value method (MAVT). The suggested method inflates the relative attractiveness of the alternatives that are closer to the best solutions (used by VIKOR). A numerical example is also provided to illustrate the applicability of the approach. This method can be a useful tool where public opinions based on subjective perceptions in a public participation process are of particular interest rather than assessing verifiable facts, i.e., observable, measurable data.

Journal of Transportation Safety & Security, 2018

ABSTRACT Selecting proper restraint systems for road-work zone areas is essential in ensuring the... more ABSTRACT Selecting proper restraint systems for road-work zone areas is essential in ensuring the safety of motorists and construction workers as well as preventing occurrence of severe accidents. Regulations surrounding these choices vary greatly with some countries leaving the discretion to the managers whereas others mandate the use of barriers meeting specific requirements based on how they will be used. However, some nations have very detailed specifications including requirements for barriers to meet specified performances with respect to their application areas. Identifying performance criteria and making the right choices will determine how well authorities and traffic managers are able to provide safer environments for their workers. This article summarizes performance requirements and development details of a precast slim temporary concrete safety barrier, slim temporary concrete safety barrier (STCSB 50), mainly utilized to guide the traffic flow and safely divide lanes on motorways. Having 50 cm in height with a width of only 24 cm at the base and 12 cm throughout its height makes STCSB 50 a very narrow and low-profile work zone barrier. The design was crash tested according to EN1317 requirements, and its performance clearly demonstrated its robustness as a state of the art safety barrier for work zone applications. Its implementation is therefore recommended to protect road users and construction site workers at work zone areas.

Case Studies on Transport Policy, 2019

The increasing usage of private vehicles causes serious environmental, social and economic proble... more The increasing usage of private vehicles causes serious environmental, social and economic problems necessitating efficient transit systems for big cities all over the world. Appropriate transit systems require consideration of a variety of service quality criteria. Among them, speed, comfort, economy and safety are the most important ones. Considering characteristics and demand of existing light rail transit system (LRT) of Bursa, Turkey, bus rapid transit (BRT) system, comparatively as a cheaper alternative, is investigated in this study to realize how it would have provided competitive service quality in terms of comfort, capacity and operational cost. First, the existing LRT is evaluated with the current demand. Then, as if it were replaced with an imaginary BRT system, how the BRT system would have responded to the existing demand in terms of capacity and comfort are examined. All models are developed in PTV VISSIM simulation environment. The results are compared and important finding are outlined.

Uludağ University Journal of The Faculty of Engineering, 2018

Öz: Düşük yakıt tüketimi ve elde edilebilirlik maliyeti motosiklet kullanımını gün geçtikçe popül... more Öz: Düşük yakıt tüketimi ve elde edilebilirlik maliyeti motosiklet kullanımını gün geçtikçe popüler kılmaktadır. Yanlış ama alışıla gelmiş kullanım tarzı ile kendi trafik şeritleri üzerinde hareket etmek yerine taşıtlar arasında manevra yaparak yavaş ve rahatsız eden trafikten kaçınmaları bu ulaşım aracına görünür bir avantaj sağlamaktadır. Yol kullanım hakkını önemsemeyen bu alışkanlıklar trafik sıkışıklığına maruz kalmadan yolculuğu mümkün kılıyor olsa da bu durum kaza yapma olasılığını artırmakta ve ciddi yaralanmalar hatta ölümlerle sonuçlanan kazalara sebep olabilmektedir. Genelde kazalar açısından motosiklet diğer ulaştırma araçlarıyla birlikte değerlendirildiği için motosiklet kazalarıyla ilgili detaylı araştırmalar ülkemizde oldukça yetersiz kalmaktadır. Bu çalışmada Hatay merkez ilçesi Antakya"da 2005-2009 yılları arasında meydana gelen yazılı kaza raporları ile tutanak ekleri özel izin ile temin edilerek detaylı olarak incelenmiştir. Motosikletle ilgili olan kazalar ayıklanarak; kazaların oluş sebepleri araştırılmış ve bu veriler doğrultusunda elde edilen sonuçlara dayanarak mevcut durum değerlendirilmiştir.

Safety, 2018

In Turkey, concrete V-shaped ditches are formed at the median section of divided highways to prov... more In Turkey, concrete V-shaped ditches are formed at the median section of divided highways to provide drainage. Recent accidents show that these ditches actually present safety risks to vehicles entering the medians. Vehicles either cross over the ditch, roll over, or become trapped in the ditch, depending upon the mass, size, speed, and angle of the entering vehicle. To overcome this safety risk and reduce the severity of these accidents, longitudinal barriers are installed along these ditches. Currently, in Turkey, steel barriers are extensively used to improve traffic safety at median ditches. In this paper, the crash performances of steel and concrete barriers used at medians with ditches are compared. A model of a standard steel EDSP-1.33 barrier and a model of a newly developed concrete C470 barrier were constructed, and impact simulations were performed for when they are installed at a ditch slope break point. A nonlinear finite element program, LS-DYNA, was used for the analy...

Uludağ University Journal of The Faculty of Engineering, 2017

Kent içi ulaşım sistemlerinde alternatif bir ulaşım sistemi oluşturan tramvayların, gün geçtikçe ... more Kent içi ulaşım sistemlerinde alternatif bir ulaşım sistemi oluşturan tramvayların, gün geçtikçe toplu ulaşımdaki rolleri artmaktadır. Türkiye'de her ne kadar tramvay kullanımı yeterli seviyelerde olmasa da, ülkemizin ürettiği ilk tramvay olan İpekböceği (SilkWorm) tramvayının Türkiye raylı sistem tarihindeki yeri şüphesiz önemli olacaktır. İpekböceği 2013 yılının sonlarına doğru işletime açılan Bursa T1 tramvay hattında hizmet vermeye başlamasıyla birlikte bazı tartışmaları da beraberinde getirdi. Çok yeni olmakla birlikte bu önemli tramvay hattının gözlemlenen bazı sorunları mevcuttur. Mevcut verilerin henüz yeterli olmamasından dolayı şimdilik bu çalışmada sadece bir GZFT analizi yapılarak ortaya çıkan sorunlara karşı bazı çözüm önerileri sunulmaktadır.

Asia-Pacific Journal of Operational Research, 2017

Public involvement in transportation planning and decision-making process is a key component for ... more Public involvement in transportation planning and decision-making process is a key component for ensuring that decisions are made with consideration of public needs and preferences. In this paper, a weighted Euclidean distance based TOPSIS method (WEDTOPSIS) is developed for modeling such a public decision-making process. The Weber–Fechner psycho-physical law is adopted for behavioral modeling of human judgments. Distances to the positive-ideal and negative-ideal solutions of TOPSIS are converted to value measurement models using the Weber–Fechner law. The proposed method is applied on a case where public approval of two different types of public bus operation systems considering six criteria is sought. A numerical illustration is also provided to demonstrate the applicability of the approach. The method provides plausible results in terms of preferences, and shows a high agreement with the ordinary TOPSIS in terms of rankings. Another example showing disagreement on ranking is furt...

Advances in Civil and Industrial Engineering

In transportation planning, design of intersections is required some concrete decisions. It is mo... more In transportation planning, design of intersections is required some concrete decisions. It is mostly related to capacity, safety and economy. In many applications, capacity is considered as the main factor for design purpose and type of intersection is determined regarding the capacity. But it is known that safety and economy are as important as the capacity. In order to handle this problem, a multi-criteria decision making approach (AHP) is used. Four intersection types are used. Fuel consumption, emission rates, delay, cost of intersection type and safety parameters are taken into account in the decision process. These intersection types are tested by SIDRA Intersection software using the parameters listed above. The data obtained by SIDRA software is used in the AHP model. Weights of the factors used in the AHP model are varied considering the views of capacity and economy. And results and applicability of the model are discussed.

Pamukkale University Journal of …, 2011

Antakya ili ve belde belediyeleri sınırlarının iç içe geçmiş olması nedeniyle büyükşehirlere benz... more Antakya ili ve belde belediyeleri sınırlarının iç içe geçmiş olması nedeniyle büyükşehirlere benzese de, yönetim şekliyle benzememekte; bu durum özellikle kent ulaşım sorunlarının çözümünde ciddi problemler oluşturmaktadır. Bu sorunların çözümü için gerekli aksiyonların uygulanmasında, il ve belde belediyeleri arasında yetki ve sorumluluk kargaşası çıkmaktadır. Bu durum, sürdürülebilir kalkınma için hayati önem taşıyan ulaşım ve trafik açısından, ciddi aksamalara ve problemlere neden olmaktadır. Özellikle son yıllarda artan otomobil ile seyahat talebi, Antakya'nın kısıtlı ulaşım altyapısındaki mevcut problemlerin artmasına neden olmaktadır. Artan trafik sıkışıklığı, kazalar, çevresel ve sosyal problemler; yerel düzeyde kararlı aksiyonları ve politikaları gerekli kılmıştır. Fakat bunun gerçekleşmesi için de yerel yönetimde yapısal reforma gitmek şarttır. Bu makalede gerek beş yıllık kalkınma programlarında ortaya konan hedefler, gerek gelişmiş ve gelişmekte olan ülkelerde yapılan uygulamalar göz önüne alınarak; yerel düzeyde yapılabilecek yapısal reformlara dikkat çekilmiştir.

Trafik sakinlestirme icin en fazla tercih edilen yontemlerin basinda hiz tumsekleri uygulamasi ge... more Trafik sakinlestirme icin en fazla tercih edilen yontemlerin basinda hiz tumsekleri uygulamasi gelmektedir. Dolayisiyla hiz tumsegi uygulamalarinin mevcut standartlara uyumlulugu, belirlenen hiz azaltma hedefine ulastirip ulastirmadigi ve arac/yolcu uzerindeki etkilerinin belirlenmesi gibi hususlarin arastirilmasi onem tasimaktadir. Calisma kapsaminda Bursa Nilufer bolgesinde bulunan Uludag Universitesinde yaygin olarak kullanilan hiz tumsekleri ornek alinarak, bunlarin Turkiye standardina (TS 6283) uygunlugu kontrol edilecek ve surucu/yolcu uzerindeki etkileri konfor acisindan degerlendirilecektir. Calisma uc asama olarak dusunulmektedir. Simulasyon yontemi ile tumsek ve araclarin modellenerek degisik hiz ve tipteki arac tiplerinde meydana gelen titresimlerin yatay/dusey ivmeler cinsinden belirlenerek surucu/yolcu acisindan konfor seviyelerinin ISO 2631 standardina gore uygunlugu calismanin ilk asamasini olusturmaktadir (calismada bu ilk asama anlatilmistir). Ikinci asamasi ise ara...