<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper describes the analysis of tram traffic noise situation in residential areas in the vicinity of Drzic Avenue, one of the major routes between the northern and southern part of the Croatian capital city Zagreb, and the effect of low barriers placed by the tracks on tram noise mitigation. In order to evaluate the effect of planned protection measure, noise models were produced and verified with short-term field measurements. Calculations were conducted by means of noise prediction software, using European interim noise prediction method and 3D model of analyzed area. Finally, the results of noise calculations for existing tram traffic situation and planned measure of protection are presented on noise maps.</abstract>

Sc.novice, MCE, University of Zagreb, Faculty of Civil Engineering, Department for Transportation

Prof., PhdCE, University of Zagreb, Faculty of Civil Engineering, Department for Transportation

The Analysis of Low Noise Protection Barriers Influence on Tram Traffic Noise Levels

<abstract xmlns="http://www.w3.org/1999/xhtml"> The process of division - combining of streams in mixers with bars and radial and longitudinal scrapers was studied. The number of unique streams that are formed after passing each row of longitudinal bars and the total amount of them were determined. This is demonstrated by migration of the particles along the mixer from left to right and vice versa, from the center of the drum towards the periphery and vice versa. In the process of mixing the particles in the center gain normal distribution and the ones on the side - sectioned normal distribution. The sum of normal distribution with the sectioned normal distribution leads to an equable distribution along the drum and transverse planes and to a homogeneous mixing of the components. The quality of mixing had been investigated and an optimal mixing regime for the mixer with radial and longitudinal bars and scrapers was proposed.</abstract>

Associate Professor, PhD., Technical University of Moldova

Department Chief., PhD., Technical University of Moldova

senior lecturer, Technical University of Moldova

The Quality of Mixing in Mixers with Bars and Radial and Longitudinal Scrapers

<abstract xmlns="http://www.w3.org/1999/xhtml"> Prediction and optimization of in-service performance of road pavements during their live time is one of the main objectives of pavement research these days. For flexible pavements the key performance characteristics are fatigue and low-temperature, as well as permanent deformation behavior at elevated temperatures. The problem facing pavement designers is the need to fully characterize the complex thermo-rheological properties of hot mix asphalt (HMA) over a wide temperature range on the one hand, while on the other also providing a realistic simulation of the traffic- and climate-induced stresses to which pavements are exposed over their design lives of 20 to 30 years. Where heavily trafficked roads are concerned, there is therefore an urgent need for more comprehensive test methods combined with better numerical forecast procedures to improve the economics and extend the service lives of flexible pavements under repair and maintenance programs. This papers therefore focus on performance-based test methods on the basis of existing European standards that address effective mechanical characteristics of bituminous materials and which may be introduced into national requirements within the framework of European HMA specifications. These test methods comprise low temperature tests, i.e. the tensile stress restrained specimen test or the uniaxial tensile strength test, stiffness and fatigue tests, i.e. the four point bending beam test or the uniaxial tension compression test, as well as methods to determine permanent deformation behavior by means of dynamic triaxial tests. These tests are used for the performance-based mix design and subsequently implemented in numerical pavement models for a reliable prediction of in-service performance, which, in combination with performance-based tests, enables a simulation of load-induced stresses and mechanogenic effects on the road structure and thus improved forecasts of the in-service performance of flexible pavements over their entire service lives.</abstract>

Performance-Based Asphalt Mix and Pavement Design

<abstract xmlns="http://www.w3.org/1999/xhtml"> Environmental protection has become a common issue in every area, but extremely important for the domains which deal with intensive energy consumption as it is the case of the transportation. Achieving the sustainable cities on the other hand, is also focused on the protection of the environment in order to provide a higher quality of life for the population. Therefore it is considered that by improving the urban transportation planning additional benefits could be provided for both the environment and the sustainable development of the cities. One possibility is to supplement the traditionally land-use plans with the transportrelated zones analysis, where the city is divided in public transport, pedestrian and caroriented zones. Analyzing the transport-related zones of a city is important as it provides additional information in the assessment of the development trend. The process of zoning was conducted for the city of Cluj-Napoca, Romania. In this paper, the outcome of the zoning was analyzed for a more comprehensive review of the urban transport in order to attain a sustainable-oriented approach of the urban area development.</abstract>

Phd student, Assistant professor, Technical University of Cluj-Napoca

Phd, Professor, Technical University of Tallinn

Phd, Professor, Technical University of Cluj-Napoca

Phd student, Technical University of Tallinn

Sustainable Urban Transport Planning

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper is intended to show the design of two composite bridges along the Orastie- Sibiu motorway, from the basic concepts, applied without the need for a clause-by- clause checking of codes and standards, to the construction methods. The bridges are seismically isolated in the longitudinal direction, while transversally the seismic action is distributed among the piers. Calculations have been carried out through state of the art procedures, taking into account form effect of the cross section. For this reason, different FE models have been set up to study different aspects of the behavior, with increasing degrees of approximation. For example, “beam” elements have been utilised to investigate global effects both in the linear and non linear range, while more accuate 2D and 3D elements have been used for refined cases such as stress checks and local buckling analyses. The present paper goes into detail in particular for what concerns some of the most interesting parts of the design process for the specific case. Namely, time dependent properties of the materials have been considered, and extensive “staged construction” analyses have been carried out to ensure safety in each phase of the complex life of the bridges, while at the same time guaranteeing significant cost savings.</abstract>

PH.D. Professor of Structural Engineering, ITALROM Inginerie Internationala

Associate Professor, Technical University of Civil Engineering Bucharest

Structural Engineer, ITALROM Inginerie Internationala

Steel-Concrete Viaducts in the Orastie-Sibiu Highway: a Eurocode Compliant Project

<abstract xmlns="http://www.w3.org/1999/xhtml"> Reflective cracking is a major concern for engineers facing the problem of road maintenance and rehabilitation. The problem appears due to the presence of cracks in the old pavement layers that propagate into the pavement overlay layer when traffic load passes over the cracks and due to the temperature variation. The stress concentration in the overlay just above the existing cracks is responsible for the appearance and crack propagation throughout the overlay. The analysis of the reflective cracking phenomenon is usually made by numerical modeling simulating the presence of cracks in the existing pavement and the stress concentration in the crack tip is assessed to predict either the cracking propagation rate or the expected fatigue life of the overlay. Numerical modeling to study reflective cracking is made by simulating one crack in the existing pavement and the loading is usually applied considering the shear mode of crack opening. Sometimes the simulation considers the mode I of crack opening, mainly when temperature effects are predominant.</abstract>

The Reflective Cracking in Flexible Pavements

<abstract xmlns="http://www.w3.org/1999/xhtml"> Numerous studies at KIT prove that high frequency mechanical impact (HFMI) treatment is an efficient method for increasing the fatigue strength of welded steel structures. Within different research projects it was found that HFMI-methods can be used successfully for new and existing structures in order to extend the fatigue life. This paper gives an overview of the current status of existing steel bridges in Germany regarding aspects like bridge age distributions and traffic loads. Based on that overview welded joints susceptible to fatigue failure are identified. Using component-like small scale specimens, HFMI-methods were investigated within the objective of implementing an effective application for new and existing structures. Applying the fatigue test data observed, existing design proposals are evaluated and design recommendations for HFMI-treated joints are given. As a result of the research work, a transfer into practice has been realized and different applications are illustrated using the example of bridge constructions made of steel.</abstract>

Head of Department, Chair for Steel Structures, Univ.-Prof. Dr.- Ing., KIT Steel and Lightweight Structures, Research Center for Steel, Timber and Masonry, Tel. +49 721 608 42215, Otto-Ammann-Platz 1,5 & 7, 76131 Karlsruhe, Germany

Research Assistant, Dipl.-Ing., KIT Steel and Lightweight Structures, Research Center for Steel, Timber and Masonry, Tel. +49 721 608 42215, Otto-Ammann-Platz 1,5 & 7, 76131 Karlsruhe, Germany

Research Assistant, Dipl.-Ing. Dipl.-Wirtsch.-Ing KIT Steel and Lightweight Structures, Research Center for Steel, Timber and Masonry, Tel. +49 721 608 42215, Otto-Ammann-Platz 1,5 & 7, 76131 Karlsruhe, Germany

New And Existing Bridge Constructions - Increase of Fatigue Strength of Welded Joints by High Frequency Mechanical Impact Treatment

AHEAD OF PRINT

Volume 12 (2023): Issue 2 (December 2023)

Volume 12 (2023): Issue 1 (July 2023)

Volume 11 (2022): Issue 2 (December 2022)

Volume 11 (2022): Issue 1 (July 2022)

Volume 10 (2021): Issue 2 (December 2021)

Volume 10 (2021): Issue 1 (July 2021)

Volume 9 (2020): Issue 2 (December 2020)

Volume 9 (2020): Issue 1 (July 2020)

Volume 8 (2019): Issue 2 (December 2019)

Volume 8 (2019): Issue 1 (July 2019)

Volume 7 (2018): Issue 2 (December 2018)

Volume 7 (2018): Issue 1 (July 2018)

Volume 6 (2017): Issue 2 (December 2017)

Volume 6 (2017): Issue 1 (July 2017)

Volume 5 (2016): Issue 2 (December 2016)

Volume 5 (2016): Issue 1 (July 2016)

Volume 4 (2015): Issue 2 (December 2015)

Volume 4 (2015): Issue 1 (July 2015)

Volume 3 (2014): Issue 2 (December 2014)

Volume 3 (2014): Issue 1 (July 2014)

Volume 2 (2013): Issue 2 (December 2013)

Volume 2 (2013): Issue 1 (July 2013)

Volume 1 (2012): Issue 1 (December 2012)

Romanian Journal of Transport Infrastructure

Through its appearance (twice per year) magazine aims to be a high-quality scientific source of information for researchers, academics, engineers, practitioners, policy – makers, PhDs, students and anyone interested in various issues related to transport infrastructure: roads, bridges, railways and geotechnics.  The aim of the journal is to reflect the results of fundamental and applied research at a high level, maintained through a rigorous peer review performed by specialists, well known in the field, both at national and international level.  Romanian Journal of Transport Infrastructure (RJTI) involves the design, manufacture and maintenance of all categories of roads, airports, bridges, railways, tunnels and all types of transportation mean. The journal deals also with the materials and technologies in transport infrastructure and transportation engineering.  Welcome to receive original research papers involving latest discoveries and improvements in this area.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 